Emergency Procurement: Supply of shut-off valves to Ukraine

New amendment added #2: Dear Bidders,Please be advised that RFQ/2026/61636 has been revised and amended.Kindly refer to the document RFQ_2026_61636_RFQ Revision 02_Summary of Revisions.docx for a summary of the changes made to the initial RFQ documents package.The deadline for submisison of bids has been extended until 30 March 2026.Thank you.With best regards,Procurement Team

New clarification added: Dear Customer!The question concerns the requirements specified in lots 1 and 2, namely, clause 2.3 “Technical requirements for flanges”:“2.3.2 Material: Flanges used as part of pressure equipment shall be manufactured exclusively from materials permitted for pressure equipment in accordance with Directive 2014/68/EU (PED). The flange materials shall be selected only from the materials listed in Table 9 and Annex D of EN 1092-1 ... ”.Please note that the EN 1092-1 standard in the specified sections contains a list of mainly European steel grades, in particular such as P235GH (1.0345), P245GH (1.0352), P250GH (1.0460), C22.8 (1.0460), 16Mo3 (1.5415), etc.At the same time, this approach limits the possibility of using equivalent materials that are widely used by domestic manufacturers and meet similar requirements for chemical composition and mechanical properties.In particular, when equipping steel ball valves with connecting flanges in Ukraine, steel 20 is widely used, which in its characteristics is similar to European grades such as P245GH / C22.8 and provides the necessary indicators of strength, weldability and operational reliability.In this case, the conformity of materials can be confirmed by certificates in accordance with EN 10204 type 3.1, which ensures full traceability and quality control.In connection with the above, we ask you to consider the possibility of amending the requirements of clause 2.3.2 in terms of allowing the use of equivalent materials, namely:"...or equivalent materials that meet the specified standards in terms of chemical composition, mechanical properties and conditions of use, with mandatory confirmation of conformity by a certificate of EN 10204 type 3.1".This approach will ensure compliance with pressure equipment safety requirements, expand the range of potential participants, and avoid unjustified restrictions on competition.     __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  The requirement for materials to comply with Directive 2014/68/EU (PED) and EN 1092-1 is essential for the safety of pressure equipment. However, the use of equivalent materials is permissible, provided they meet the technical criteria for the specified operating conditions.  Clause 2.3.2 of the Schedule of Requirements for Lot 1 and Lot 2 will be amended to read as follows:  "2.3.2 Material: Flanges used as part of pressure equipment shall be manufactured exclusively from materials permitted for pressure equipment in accordance with Directive 2014/68/EU (PED).  The flange materials shall be selected only from the materials listed in Table 9 and Annex D of EN 1092-1 or equivalent materials (e.g., Steel 20 or similar) that meet or exceed the specified standards in terms of chemical composition, mechanical properties, and operating conditions (including mandatory impact toughness at -20°C) and shall comply with the applicable material standards referenced therein.  Compliance of chemical composition, mechanical properties and heat number, ensuring full material traceability, shall be confirmed by a material inspection certificate in accordance with EN 10204 type 3.1 and, if applicable, type 2.1 or 3.2."  Bidders are reminded that the final responsibility for ensuring the material's suitability for the specified pressure and temperature ratings rests with them and the manufacturer of the offered Goods.  Thank you.   

New clarification added: Good day, dear Customer!The question concerns the requirements for the anti-corrosion coating specified in Lot 2 — “Steel ball valves”, namely:clause 2.1.6: “…The dry film thickness (DFT) shall be at least 250 μm”;clause 1.9.3: “… The thickness (DFT) must be at least 250 μm or as per the manufacturer's standard for the required category.…”.At the same time, according to clause 2.1.24 of the technical requirements:“The stem shroud (neck) height shall allow the installation of thermal insulation with a minimum thickness of 100 mm without interference with valve operation or maintenance access.”We draw your attention to the fact that in the case of using thermal insulation with a thickness of not less than 100 mm, the external surfaces of the valve are actually not exposed to direct environmental influences, which makes the requirement for a coating thickness of DFT ≥ 250 microns technically redundant.At the same time, even in cases of operation without thermal insulation, the practice of leading European manufacturers of steel ball valves involves the use of standard anti-corrosion coating systems with a thickness, as a rule, in the range of 80–160 μm, depending on the operating conditions and the manufacturer's internal standards.Thus, the requirement for DFT ≥ 250 μm is not typical for most serial products and may limit the participation of manufacturers who use standardized and proven solutions.In addition, overestimated requirements for coating thickness:• lead to an unjustified increase in the cost of products;• do not have a significant impact on the durability of the equipment under standard operating conditions;• limit competition among suppliers.In connection with the above, we ask you to consider the possibility of amending the technical requirements in the following wording:“The dry film thickness (DFT) of the anti-corrosion coating must be at least 100 μm or comply with the manufacturer's standard and the operating conditions of the equipment.”This approach will ensure the technical feasibility of the requirements, compliance with European practice, and expansion of competition without deterioration of operational characteristics.     __CLARIFICATION RESPONSE__     Dear Bidder!   Thank you for yot request.  The requirement for a minimum Dry Film Thickness (DFT) of 250 μm is maintained to ensure long-term equipment resilience. The Bidder's assumption that thermal insulation eliminates the need for thick coating is technically incorrect. On the contrary, Corrosion Under Insulation is a significant risk in district heating chambers, if moisture penetrates the insulation, it creates a trapped corrosive environment that can lead to rapid metal degradation.  Standard factory coatings of 80-160 μm are typically intended for transport protection or mild environments and do not guarantee a 30-year service life in high-humidity underground installations.  Regarding the requested amendment, the existing wording of the technical requirements already provides the necessary flexibility for manufacturers.Specifically, Clause 1.9.3 states:"...The thickness (DFT) must be at least 250 μm or as per the manufacturer's standard for the required category."  This allows Bidder to propose a coating system that follows their established factory standards, provided those standards are designed for the relevant environmental corrosivity category (e.g., Category C3 or C4 according to ISO 12944) to ensure high durability.  To avoid unjustified restrictions, the Clause 2.1.6 of the Schedule of Requirements for Lot 1 and Lot 2 will be amended to read as follows:  “2.1.6 All external non-stainless surfaces of the valves shall be protected with an anti-corrosion coating in accordance with ISO 12944. The corrosivity category shall be at least C3 (or C4 for underground/high humidity installations).”  However, the benchmark for durability is maintained in Clause 1.9.3 to ensure long-term protection against Corrosion Under Insulation.  In summary, the requirement remains unchanged. Instead, revision wording expands competition and aligns technical requirements with the diverse range of high-performance coating systems used by leading manufacturers. Bidders shall provide technical documentation (data sheets or manufacturer's standards) confirming that the proposed coating system is suitable for long-term operation in district heating systems, with a preference for a cumulative DFT of 250 μm or a documented equivalent for the required protection category.  Thank you.

New clarification added: Good day, dear Customer!The technical requirements for the subject of procurement (lot 2 — “Steel ball valves”, clause 2.2 “Technical requirements for electric actuators”) state:"2.2.1 Electric actuator is a complete assembly including electric drive, gearbox, output shaft and control elements, mounted directly on the valve";"2.2.2.2 The gearbox shall provide reduction of rotational speed and increase of output torque required for valve operation."Please note that in the case of using electric drives, the selection of the drive for steel ball valves is carried out by the valve manufacturer based on the calculated torque on the shaft (spindle) of the crane.Depending on the required torque and the design features of the crane, it is not always necessary to install an additional mechanical gearbox between the crane and the electric drive. In some cases, it is possible to install the electric drive directly on the crane without using a gearbox.In connection with the above, we ask you to consider the possibility of amending the technical requirements as follows:"2.2.1 Electric actuator is a complete assembly including electric drive, gearbox (if necessary, at the manufacturer's discretion), output shaft and control elements, mounted directly on the valve";"2.2.2.2 The gearbox (if present in the electric actuators) shall provide reduction of rotational speed and increase of output torque required for valve operation."     __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  The requirement for the mandatory use of a gearbox has been reconsidered. It is acknowledged that for certain valve sizes and torque requirements, an electric actuator can be mounted directly onto the valve without an intermediate gearbox, provided the actuator's output torque exceeds the valve's breakaway torque with an appropriate safety margin.  Clause 2.2.1 of the Schedule of Requirements for Lot 1 and Lot 2 will be amended to read as follows:  "2.2.1 Electric actuator is a complete assembly including electric drive, gearbox (if necessary, at the manufacturer's discretion), output shaft and control elements, mounted directly on the valve.  The manufacturer is responsible for selecting the appropriate drive configuration (with or without a gearbox) based on the calculated torque requirements and ensuring that the operating time complies with the system's safety standards."  Clause 2.2.2.2 of the Schedule of Requirements for Lot 1 and Lot 2 will be amended to read as follows:  "2.2.2.2 The gearbox (if present in the electric actuators) shall provide reduction of rotational speed and increase of output torque required for valve operation.”  Thank you. 

New amendment added #1: Dear Bidders,Please be advised that RFQ/2026/61636 has been revised and amended.Kindly refer to the document RFQ_2026_61636_RFQ Revision 01_Summary of Revisions.pdf for a summary of the changes made to the initial RFQ documents package.The deadline for submisison of bids has been extended until 26 March 2026.The deadline for submisison of clarification requests has been extended until 19 March 2026.Thank you.With best regards,Procurement Team

New clarification added: Subject: Clarification of technical requirements for valve connection standards (lot 1, clause 2.1.12.3)Good afternoon, dear Customer!The technical requirements for the subject of procurement in lot 1, clause 2.1.12.3, state:“Connection standards: for butt-welded ends (clauses 1.1–1.5, 1.7, 1.9, 1.10, 1.12, 1.13): EN 12627 (butt-welded ends for steel valves)”.Please note that EN 12627 is a current European standard that defines the dimensions and shape of butt-welded ends for industrial steel pipeline valves.The standard establishes requirements for the geometry of the ends of valve bodies, gate valves and other valves to ensure a high-quality welded connection with pipes.According to EN 12627, the outer diameters of the connecting pipes correspond to the following nominal sizes:DN (mm) Outer diameter A (mm) EN 12627300 323.9400 406.4500 508.0600 610.0800 813.0At the same time, when using pipelines in Ukraine, the connecting pipes must comply with the state standards of DSTU:DN (mm) Outer diameter (mm) DSTU300 325400 426500 530600 630800 820In this regard, to prevent discrepancies and potential problems when installing shut-off valves on existing pipelines, we ask you to:1. Specify in the tender documentation the outer diameters of the connecting pipes of the valves (gates) in accordance with DSTU, applicable in Ukraine.2. Establish unambiguous technical parameters to avoid inconsistencies between EN standards and national regulations during the delivery and installation of equipment.Thank you for considering our request.       __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  Taking into account the technical inquiries regarding the discrepancy between international and national pipeline standards, the following amendments are hereby made to the Technical Specifications for Lot 1:  Clause 2.1.12.3 will be amended to read as follows:  "2.1.12.3. Connection Standards:  For butt-welded ends (items 1.1-1.5, 1.7, 1.9, 1.10, 1.12, 1.13): EN 12627 (butt-welded ends for steel valves), with mandatory adaptation of the outer diameters to match the pipeline dimensions according to Ukrainian standards (DSTU):  DN300: outer diameter 325 mm;  DN400: outer diameter 426 mm;  DN500: outer diameter 530 mm;  DN600: outer diameter 630 mm;  DN800: outer diameter 820 mm.  For flanged ends (items 1.6, 1.8, 1.11, 1.14): EN 1092-1, PN25 (Type 11, Form B).  Compliance must be confirmed by the manufacturer's technical documentation (e.g. GA drawing, technical passport, data sheet, etc.). The specified outer diameters for butt-welded ends must be clearly indicated on the provided drawings."   Bidders are required to ensure that their technical proposals strictly adhere to these updated dimensions. Any proposal featuring standard EN diameters (e.g., 508 mm for DN500 or 813 mm for DN800) without the required adaptation will be considered non-compliant with the technical requirements.  For Lot 2 - Ball Valves:  Clause 2.1.12.3 will be amended to read as follows:  "2.1.12.3 Connection Standards:  For butt-welded ends (items 2.1, 2.2, 2.4, 2.6, 2.8, 2.10, 2.13, 2.14, 2.16, 2.17): EN 12627 (butt-welded ends for steel valves). The outer diameters of the valve ends must be compatible with the following pipeline dimensions:  DN50: outer diameter 60.3 mm;  DN65: outer diameter 76.1 mm;  DN80: outer diameter 88.9 mm;  DN100: outer diameter 114.3 mm;  DN125: outer diameter 139.7 mm;  DN150: outer diameter 168.3 mm;  DN200: outer diameter 219.1 mm;  DN250: outer diameter 273.0 mm.  For flanged ends (items 2.3, 2.5, 2.7, 2.9, 2.11, 2.12, 2.15, 2.18): EN 1092-1, PN25 (Type 11, Form B).  Compliance must be confirmed by the manufacturer's technical documentation (e.g. Declaration of Conformity, technical passport, data sheet, catalogue, etc.). The manufacturer must ensure that the pipe ends' dimensions allow for high-quality welding to the specified pipeline diameters."  Thank you.

New clarification added: Dear Customer.Section C.2 “Delivery Requirements” states that the delivery of goods must be made no later than 90 days after contract issuance.At the same time, we draw your attention to the fact that the subject of the procurement is non-standard items of equipment with an electric drive, which are manufactured by manufacturers under individual orders. Such equipment is not a warehouse product and requires a full production cycle, which includes design, manufacturing, factory testing, assembly and logistics.According to official confirmations from manufacturing plants, the full cycle of production, testing and delivery of the specified equipment is at least 120 days.Given the above, the delivery period of 90 days established in the tender documentation may be technically difficult for most manufacturers of such equipment to meet.In order to ensure realistic conditions for the implementation of the contract, attract a wider range of participants in the procurement procedure, and obtain high-quality equipment, we ask you to consider the possibility of making changes to the tender documentation and setting a deadline for the delivery of goods - up to 140 calendar days from the date of conclusion of the contract.     __CLARIFICATION RESPONSE__     Dear Bidder! Thank you for yot request.Following the request, subsections C.1 and C.2 "Delivery Requirements" of the Section II: Schedule of requirements will be amended to read as follows:"Bidders shall deliver and unload the goods as soon as possible, but no later than within 140 calendar days fafter contract issuance.Bidders must provide realistic delivery schedules for the proposed goods within their tender proposal.Partial delivery of goods in batches within the specified period is permitted."Thank you.

New clarification added: Dear Customer.The technical requirements for the subject of the procurement state that the declared design life of the valves must be based on compliance with EN 488 / EN 13941 (or equivalent ) standards. Please note that the EN 488 standard regulates the requirements for valves intended for integration into pre-insulated district heating pipeline systems, and the EN 13941 standard establishes the requirements for the design and installation of such pre-insulated pipeline systems.At the same time, the subject of the procurement is steel disc butterfly valves with triple eccentricity, which are typical industrial pipeline valves and are not components of factory pre-insulated pipeline systems. For this type of valves, other industry standards (e.g. EN 593) are usually used, which regulate the design, testing and performance of the valves.In connection with the above, we ask you to consider the possibility of making appropriate changes to the technical requirements and removing the reference to the EN 488 / EN 13941 standards, as they are not directly related to the design and operation of steel disc butterfly valves with triple eccentricity.       __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request. We acknowledge that standards EN 488 and EN 13941 apply specifically to components of pre-insulated pipeline systems for district heating and do not directly govern the design of triple eccentric steel butterfly valves as standalone industrial components. In this regard, Clause 2.1.5 of the technical requirements will be amended. The mandatory requirement for compliance with EN 488 / EN 13941 is removed, while the requirement to confirm the design service life remains. Clause 2.1.5 will be amended to read as follows:  "2.1.5 The proposed valves shall be designed for a minimum design service life of 30 years under the specified operating conditions of the district heating system.  The declared service life must be based on documented design criteria, material specifications, and product performance characteristics.  Confirmation of the declared design service life must be provided in the manufacturer's declaration or technical data sheet (passport)."  Therefore, bidders must confirm the declared design life by providing the relevant manufacturer's documentation.  Thank you.

New clarification added: Rod  material:Vexve’s rod material is stainless steel(1.4460 X3CrNiMoN27-5-2). It has superior corrosion properties compared to pure carbon steel. The corrosion properties of the disc are not affected by time or erosion.In view of the above, we kindly ask you to review the provided information and confirm acceptance of the proposed rod material as compliant with the tender technical requirements.Why is ordinary carbon steel permitted for use in construction?     __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.18), it is established that the rod material must be steel, corrosion resistant, with a robust design featuring a key connection to the actuator, and graphite stem sealing.  We would like to point out that the requirements do not permit the use of ordinary carbon steel. On the contrary, it is explicitly stated that the rod material must be corrosion-resistant steel.  This category includes, in particular, stainless steels that provide enhanced corrosion resistance and operational reliability of the component under service conditions.  Therefore, the use of stainless steel (specifically type 1.4460 or equivalent) for the rod manufacturing is fully acceptable and will be considered, provided it complies with all other requirements of the tender documentation.  Thank you.  

New clarification added: The seal type for Vexve valves is metal-to-metal without the addition of graphite, as graphite is a softer material and has a tendency to wear down. The Vexve design is more reliable, which significantly increases the service life of the valve. This allows us to offer a more reliable solution.In view of the above, we kindly ask you to review the provided information and confirm acceptance of the proposed metal-to-metal sealing design as compliant with the tender technical requirements.     __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.17), the following parameters are established:  - Sealing type: Metal-to-metal, sealed by pressing;  - Seal material: Stainless steel + graphite;  - Sealing ring element: Replaceable.  The specified seal construction was selected considering the operating conditions within the district heating networks. The inclusion of graphite layers is essential to ensure reliable leak-tightness, compensation for thermal deformations, and stable performance of the sealing assembly under the specified operating parameters.  Therefore, proposals that do not include graphite in the sealing construction will be considered non-compliant with the requirements of the tender documentation.  Consequently, the proposed equipment must strictly comply with Clause 2.1.17, specifically regarding the use of a laminated sealing element made of stainless steel with graphite gaskets and the capability for its replacement.  Thank you.  

New clarification added: Disc material:Vexve’s disc material is acid-resistant stainless steel(1.4408). It has superior corrosion properties compared to pure carbon steel. The corrosion properties of the disc are not affected by time or erosion.In view of the above, we kindly ask you to review the provided information and confirm acceptance of the proposed disc material as compliant with the tender technical requirements.Why is ordinary carbon steel permitted for use in construction?     __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.15), it is established that the disc material must be steel cast, resistant to corrosion, low- or high-alloyed.This requirement provides the flexibility to use various steel grades that ensure the necessary corrosion resistance, mechanical strength, and operational reliability of the valve under specified conditions.  Therefore, the use of stainless (acid-resistant) steel, specifically material type 1.4408 (CF8M) or equivalent, is fully acceptable for consideration, as such materials belong to the category of high-alloyed corrosion-resistant steels.  Consequently, offers featuring stainless steel discs are permitted and welcomed for consideration, provided they comply with all other technical requirements of the tender documentation.  Thank you.  

New clarification added: Vexve’s butterfly valves have triple eccentric disc-seat contact which is full metal to metal pairing.Vexve’s seat design is innovative U-profile machined from ultra-high strength martensitic stainless-steel forging(17-4PH). The seat is coated with hard chrome plating which provides high hardness(~1000HV Vickers). The coating protects the seat from possible damages caused by erosion and solid particles in the flowing medium.We kindly request you to review the above information and confirm acceptance of the proposed design and materials as meeting the technical requirements of the tender documentation.       __CLARIFICATION RESPONSE__     Dear Bidder!  Thank you for yot request.  In accordance with the tender documentation:  Clause 2.1.14: The sealing socket must be stellite-coated or made of corrosion-resistant steel and must be an integral part of the casing (i.e., it shall not be welded-on or mechanically fastened to the body). The socket must also function as a mechanical limiter for the disc motion.  Clause 2.1.17: The seal type is metal-to-metal, sealed by pressing. The seal material must be stainless steel + graphite, and the sealing ring element must be replaceable.  In view of the above, the proposed technical solution may be considered only if it fully complies with the specified requirements, specifically:  - The sealing seat must be an integral (non-separable) part of the body casting.  - The material and coating must comply with the requirements for stellite or corrosion-resistant steel application.  - The design must ensure a metal-to-metal press-fit seal with a replaceable stainless steel/graphite sealing ring on the disc.  - The seat must act as a mechanical travel stop for the disc.  Thank you.  

New clarification added: Vexve body materials compared to casted body materials:For pressure bearing bodies of valves Vexve uses high quality pressure vessel carbon steels. The bodies are manufactured from pressure vessel pipes(P235GH / P355NL depending on DN-size). Pipe material has no forming defects, and they provide high reliability, stable mechanical properties, and uniform microstructure. This also means the weldability of the valves is stable property. Vexve has tens of years of experience with using pressure vessel pipes as body material for valves which are used in district energy networks across the globe.Vexve’s fully welded butterfly construction is maintenance free. If a foreign object(such as larger gravel particles) would cause damage to the disc sealing surface, the innovative U-profile makes it possible to readjust the disc shut-off position by readjusting the gear’s stop-limits. The readjusting does not require removing the valve from the pipeline.In view of the above, we kindly ask you to consider and approve the proposed solution and accept the use of the described valve body material and construction as compliant with the tender requirements.      __CLARIFICATION RESPONSE__    Dear Bidder!  Thank you for yot request.  According to the requirements of the tender documentation (Clause 2.1.13), it is established that the valve body must be integral, made of steel cast, fully cast, with an integrated sealing socket.  This requirement is mandatory and has been established considering the specific operating conditions of the district heating networks, as well as the necessity to ensure:  - High mechanical strength and structural rigidity of the casing at an operating pressure of 25 bar (2.5 MPa);  - Leak-tightness and long-term durability of the sealing assembly under high-temperature cycling;  - Minimization of the number of welded joints within the pressure-retaining components of the valves;  - Enhanced operational reliability during long-term service under fluctuating temperatures and pressure loads typical for district heating systems.  In view of the above, the requirement for an integral fully cast steel body with an integrated sealing socket remains unchanged. Proposed equipment must strictly comply with the specified technical parameters of the tender documentation. Fabricated (welded) alternatives will not be considered for Lot 1.  Thank you.  

New clarification added: Question LOT 1Item 2.1.18 Rod material: steel, corrosion resistant.hy is ordinary carbon steel allowed for use in the gate? It is the most important element and it should be the most reliable. Will an offer from a higher quality material be considered? The material of the Vexve rod is stainless steel (1.4460 X3CrNiMoN27-5-2). It has better anti-corrosion properties compared to pure carbon steel. The anti-corrosion properties of the disc do not depend on time or erosion.       __CLARIFICATION RESPONSE__    Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.18), it is established that the rod material must be steel, corrosion resistant, with a robust design featuring a key connection to the actuator, and graphite stem sealing.  We would like to point out that the requirements do not permit the use of ordinary carbon steel. On the contrary, it is explicitly stated that the rod material must be corrosion-resistant steel.  This category includes, in particular, stainless steels that provide enhanced corrosion resistance and operational reliability of the component under service conditions.  Therefore, the use of stainless steel (specifically type 1.4460 or equivalent) for the rod manufacturing is fully acceptable and will be considered, provided it complies with all other requirements of the tender documentation.  Thank you.  

New clarification added: Question LOT 1 ​Item 2.1.17 Sealing type: metal-to-metal, compression sealing.Will an offer without graphite be considered?The sealing type for Vexve valves is metal-to-metal without graphite, as graphite is a softer material and tends to wear out. The Vexve design is more robust, which significantly increases the service life of the valve. This allows us to offer a more reliable solution.        __CLARIFICATION RESPONSE__    Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.17), the following parameters are established:  - Sealing type: Metal-to-metal, sealed by pressing;  - Seal material: Stainless steel + graphite;  - Sealing ring element: Replaceable.  The specified seal construction was selected considering the operating conditions within the district heating networks. The inclusion of graphite layers is essential to ensure reliable leak-tightness, compensation for thermal deformations, and stable performance of the sealing assembly under the specified operating parameters.  Therefore, proposals that do not include graphite in the sealing construction will be considered non-compliant with the requirements of the tender documentation.  Consequently, the proposed equipment must strictly comply with Clause 2.1.17, specifically regarding the use of a laminated sealing element made of stainless steel with graphite gaskets and the capability for its replacement.  Thank you.  

New clarification added: Question LOT 1Item 2.1.15 Disc material:Why is ordinary carbon steel allowed for use in the gate? This is the most important element and it should be the most reliable. Will an offer from a higher quality material be considered? The material of the Vexve disc is acid-resistant stainless steel (1.4408). It has better anti-corrosion properties compared to pure carbon steel. The anti-corrosion properties of the disc do not depend on time or erosion.         __CLARIFICATION RESPONSE__    Dear Bidder!  Thank you for yot request.  In accordance with the requirements of the tender documentation (Clause 2.1.15), it is established that the disc material must be steel cast, resistant to corrosion, low- or high-alloyed.This requirement provides the flexibility to use various steel grades that ensure the necessary corrosion resistance, mechanical strength, and operational reliability of the valve under specified conditions.  Therefore, the use of stainless (acid-resistant) steel, specifically material type 1.4408 (CF8M) or equivalent, is fully acceptable for consideration, as such materials belong to the category of high-alloyed corrosion-resistant steels.  Consequently, offers featuring stainless steel discs are permitted and welcomed for consideration, provided they comply with all other technical requirements of the tender documentation.  Thank you. 

New clarification added: Question on LOT 1Item No. 2.1.14 - NippleA more progressive solution is proposed for the sealing nozzle. Please consider. Do you approve such a technical solution for consideration?Vexve valves have a triple eccentric contact of the disc and seat, which ensures full metal-to-metal contact.The Vexve seat design features an innovative U-shaped profile made of high-strength martensitic forged stainless steel (17-4PH). The seat is hard chrome plated, providing high hardness (~1000HV Vickers). The plating protects the seat from possible damage caused by erosion and solid particles in the flow medium.     __CLARIFICATION RESPONSE__    Dear Bidder!  Thank you for yot request.  In accordance with the tender documentation:  Clause 2.1.14: The sealing socket must be stellite-coated or made of corrosion-resistant steel and must be an integral part of the casing (i.e., it shall not be welded-on or mechanically fastened to the body). The socket must also function as a mechanical limiter for the disc motion.  Clause 2.1.17: The seal type is metal-to-metal, sealed by pressing. The seal material must be stainless steel + graphite, and the sealing ring element must be replaceable.  In view of the above, the proposed technical solution may be considered only if it fully complies with the specified requirements, specifically:  - The sealing seat must be an integral (non-separable) part of the body casting.  - The material and coating must comply with the requirements for stellite or corrosion-resistant steel application.  - The design must ensure a metal-to-metal press-fit seal with a replaceable stainless steel/graphite sealing ring on the disc.  - The seat must act as a mechanical travel stop for the disc.  Thank you. 

New clarification added: Question on LOT 1Item No. 2.1.13 Housing. Based on many years of experience in using pressure pipes as a valve body material, do you require such a technical solution for consideration?Vexve housing materials compared to cast housing materials: For valve bodies operating under pressure, Vexve uses high-quality carbon steels for pressure vessels. The housings are made of pressure vessel pipe (P235GH / P355NL depending on the DN size). The pipe material has no forming defects, provides high reliability, stable mechanical properties and a uniform microstructure. This also means stable weldability of the valves. Vexve has decades of experience using pressure vessel pipes as the body material for valves used in district heating networks worldwide.The fully welded Vexve butterfly design is maintenance-free. Should a foreign object (e.g. larger gravel particles) damage the disc sealing surface, the innovative U-shaped profile allows the disc closing position to be adjusted by readjusting the gear stops. Readjustment does not require the valve to be removed from the pipeline.      __CLARIFICATION RESPONSE__    Dear Bidder! Thank you for yot request. According to the requirements of the tender documentation (Clause 2.1.13), it is established that the valve body must be integral, made of steel cast, fully cast, with an integrated sealing socket. This requirement is mandatory and has been established considering the specific operating conditions of the district heating networks, as well as the necessity to ensure: - High mechanical strength and structural rigidity of the casing at an operating pressure of 25 bar (2.5 MPa); - Leak-tightness and long-term durability of the sealing assembly under high-temperature cycling; - Minimization of the number of welded joints within the pressure-retaining components of the valves; - Enhanced operational reliability during long-term service under fluctuating temperatures and pressure loads typical for district heating systems. In view of the above, the requirement for an integral fully cast steel body with an integrated sealing socket remains unchanged. Proposed equipment must strictly comply with the specified technical parameters of the tender documentation. Fabricated (welded) alternatives will not be considered for Lot 1.   Thank you.   

New clarification added: Dear colleagues,We kindly ask you to clarify the following questions concerning Lot 1:1.     At an operating pressure of 25 bar (g),  PN25 valves we are able to offer can withstand a maximum operating temperature of 120°C. At an operating temperature of 150°C, the PN25 the valves  can withstand a maximum operating pressure of 23.9 bar (g).Is it possible that the actual operating parameters of the water will be somewhat lower than 25 bar (g) and 150°C at the same time?If the operating parameters are exactly as specified, would it be allowed to offer the valves with bodies pressure class PN40, flange drilling PN25?2.     Can we offer valves with multi-turn electric actuators with a gearbox  instead of quarter-turn actuators?3.     It is stated that the working medium is water, however its minimum operating temperature may be −20°C. Maybe it is a mistake?Thank you in advance for your reply.         _____CLARIFICATION RESPONSE_____     Dear Bidder! Thank you for yot request 1. Please be informed that in accordance with the tender documentation, the technical characteristics of the equipment must meet the following parameters: - Operating pressure: 25 bar (2.5 MPa) - constant operating pressure; - Operating temperature range: from -20°C to at least +150°C. The equipment must ensure trouble-free operation across the entire temperature range at a constant operating pressure of 25 bar (2.5 MPa). Thus, the proposed equipment must be capable of operating under the simultaneous action of the specified parameters: temperature up to 150°C and operating pressure of 25 bar. Regarding the possibility of offering valves with a PN40 pressure class body and PN25 flange drilling, this is allowed provided there is full compliance with the following requirements: - Pressure/Temperature Rating: Guaranteed continuous operation at 25 bar (2.5 MPa) at a temperature of 150°C. - Face-to-Face Dimensions: The face-to-face (installation) dimensions must strictly comply with the technical data sheets provided in the tender documentation for PN25 valves. Any deviation in length is not permitted as it will prevent installation into the existing pipeline sections. - Connection Standards: Flange drilling and dimensions must strictly follow EN 1092-1, PN25 (Type 11, Form B) to ensure compatibility with existing counter-flanges.    2. We confirm that offering disc rotary valves equipped with multi-turn electric actuators combined with part-turn gearboxes is acceptable and will be considered equivalent to quarter-turn actuators. This configuration is allowed provided that: Technical Compliance: The entire assembly (actuator + gearbox) fully complies with the requirements of Section 2.2, including IP68 protection, smart control features, and communication interfaces. Torque Safety Factor: The combination of the multi-turn actuator and the gearbox must provide an output torque with a safety factor of at least 1.5 relative to the valve's maximum breakaway torque at a differential pressure of 25 bar. Mechanical Interface: The output flange of the gearbox must strictly comply with ISO 5211 for seamless integration with the valve stem.   3. The specified temperature range is a deliberate and mandatory requirement. It is important to clarify that -20°C refers to the potential ambient and environmental conditions, rather than the temperature of the working medium (water).  This requirement is established considering the full lifecycle of the equipment, including transportation, outdoor storage, and installation conditions, overall system reliability, as well as to ensure the valve's reliability in critical operational scenarios, such as: 1) System Shutdowns & Maintenance: During winter, if the system is drained or the circulation is stopped, the equipment in underground chambers or outdoor installations may be exposed to ambient temperatures as low as -20°C. The valve must retain its structural integrity and material toughness to prevent brittle fracture when the system is restarted. 2) Emergency Conditions: Conversely, the valve must remain fully functional in extreme heat events, such as a pipe burst or chamber flooding with high-temperature coolant (up to +150°C). The valve must be capable of transitioning between these temperature extremes without loss of functionality, leakage, or structural damage. Consequently, all pressure-retaining parts (body, disc, and bolting) must be manufactured from materials certified for operation at temperatures down to -20°C to guarantee the safety and resilience of the district heating network.    Thank you. 

New clarification added: Will UNOPS provide a project registration card and a procurement plan for VAT exemption in accordance with the current legislation of Ukraine?Thank you!          _____CLARIFICATION RESPONSE_____     Dear Bidder! Thank you for your request. The project within which the RFQ/2026/61636 is conducted is not tax exempt. Therefore, all quotations shall be submitted including VAT and all applicable taxes as well as customs duties, excise duties and any other expenses needed to meet the delivery requirement DDP Place of Delivery, Ukraine (Incoterms 2020). Thank you. 

New clarification added: Доброго дня!Уточніть, будь ласка, Ви розглядатимете часткову пропозицію?Подавати нам потрібно на цілий лот чи можна окремі позиції?/Good day!Could you please clarify whether you will consider a partial offer?Do we need to submit a bid for the entire lot or for individual items?          _____CLARIFICATION RESPONSE_____     Dear Bidder, Thank you for your request. Bidders are allowed to submit quotation for Lot 1 or Lot 2, provided that the quotation includes the complete list of items within the respective lot. Thank you.

New clarification added: Good afternoon, dear customer.The technical specifications for the valves indicate that the type of forming is casting, will die-welded ones be considered? Thank you for your answer!          ​Доброго дня, шановний замовник. В ТЗ на затвори зазначено, що тип формоутворення ЛИТВО, чи будуть розглядатися штампозварні? Дякую за відповідь!              _____CLARIFICATION RESPONSE_____       Dear Bidder! Thank you for yot requestCast valve bodies are mandatory for the disc rotary valves (Lot 1) to ensure maximum structural rigidity and dimensional stability of the seat under high-temperature thermal cycling (130-150°C). Unlike fabricated designs, the monolithic cast structure eliminates internal stresses and potential leakage points associated with welded seams, which is critical for long-term reliability and leak-tight performance in district heating mains. Consequently, fabricated (welded) alternatives will not be considered.Kindly note, that for steel ball valves (Lot 2) the requirements for casing material are:Carbon steel grade P235GH (or equivalent/better) or steel casting with connecting pipes(see clause 2.1.14 of the schedule of requirements for Lot 2) Thank you.

New clarification added: Доброго дня. Надайте будь ласка проект контракту для ознайомлення. Дякуємо.Good afternoon. Please provide a draft contract for review. Thank you.___CLARIFICATION RESPONSE___Dear Bidder,Thank you for your request.Please be informed that the UNOPS standard general conditions of contract may be found at:         https://content.unops.org/service-Line-Documents/Procurement/General_conditions_goods-Sep.-2024_V3.pdf          Thank you.