Dual Plate Check Valve

Description Dual Plate Check Valve | CI / WCB / SS304 / SS316 | API 594 | 50mm–600mm | Supplier India Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B MOQ: 10 Nos | Sizes: 50mm–600mm | Pressure: PN10 / PN16 / PN25 / Class 150 / Class 300 Standard: API 594 / IS 5312 | Type: Wafer and Lug Introduction – Dual Plate Check Valve Supplier India Krishna Industries (KELOR), based in Ahmedabad, Gujarat, India, is a trusted B2B supplier of Dual Plate Check Valves sourced from verified Indian manufacturers. We supply Dual Plate Check Valves in Cast Iron (CI), Ductile Iron (DI), Carbon Steel (WCB), Stainless Steel SS304, and SS316 body — with SS304 / SS316 plates — EPDM, NBR, and Viton seat seals — sizes 50mm to 600mm — PN10, PN16, PN25, Class 150, and Class 300 — in wafer type and lug type mounting configurations. A Dual Plate Check Valve — also called a Double Door Check Valve, Dual Disc Check Valve, or Split Disc Check Valve — is a non-return valve (NRV) that uses two spring-loaded semicircular plates (discs) hinged on a central pin. These plates open under forward flow pressure and snap shut the moment forward flow stops or reverses — preventing backflow and protecting pumps, compressors, and pipeline systems from water hammer, reverse flow damage, and pressure surges. Compared to single plate wafer check valves, the dual plate design provides significantly faster closing response, lower pressure drop, more compact face-to-face dimensions, and reduced water hammer effect — making it the preferred choice for large diameter pump discharge lines, high-velocity process piping, and EPC infrastructure projects across India. Krishna Industries supplies Dual Plate Check Valves to EPC contractors, purchase managers, plant maintenance MRO teams, water treatment project buyers, oil and gas procurement departments, pump OEMs, and bulk industrial buyers across Gujarat and PAN India. Dual Plate Check Valve vs Single Plate Wafer Check Valve — Key Differences EPC engineers and purchase managers frequently need to choose between dual plate and single plate check valves. Here is a clear comparison: Feature Dual Plate Check Valve Single Plate Wafer Check Valve Disc Design Two spring-loaded semicircular plates on central pin Single circular plate on off-centre pin Closing Speed ✅ Much faster — two small plates travel half the distance Slower — single large plate must travel full diameter Water Hammer ✅ Significantly reduced — fast closure before reverse flow builds Higher risk — slower closure allows reverse flow velocity to build Pressure Drop ✅ Lower — two plates offer less flow resistance when open Slightly higher — single plate in flow path Face to Face ✅ Very compact — shorter than single plate Compact — standard wafer type Large Diameter ✅ Preferred for 200mm and above — lighter plates, faster action Suitable up to 300mm — heavier plate in large sizes Standard API 594 / IS 5312 API 594 / IS 5312 Cost Higher than single plate ✅ More economical for smaller sizes Best For Pump discharge mains, high velocity lines, large bore piping General utility, smaller bore, lower velocity lines Selection rule: Use Dual Plate Check Valve for pump discharge lines 150mm and above, high-velocity process lines, and wherever water hammer is a concern. Use Single Plate Wafer Check Valve for smaller bore general utility service. Krishna Industries supplies both — contact us to confirm correct type for your application. Complete Material Guide — All Available Variants Body Material Options Body Material Grade Max Pressure Best For Typical Application Cast Iron (CI) IS 210 / ASTM A126 PN16 Most economical — water and utility service Water supply, STP, ETP, HVAC, irrigation, fire fighting Ductile Iron (DI) IS 1865 / ASTM A536 PN25 Higher strength — heavy duty utility Pumping stations, water mains, high pressure utility Carbon Steel (WCB) ASTM A216 WCB Class 300 Oil, gas, steam, industrial process Refineries, petrochemical, power plants, process piping Stainless Steel 304 CF8 / ASTM A351 Class 300 Corrosion-resistant — moderate chemical Chemical plant, food processing, pharma utilities Stainless Steel 316 CF8M / ASTM A351 Class 300 Maximum corrosion resistance Aggressive chemical, pharmaceutical GMP, coastal, offshore Plate (Disc) Material Options Plate Material Best For Typical Application Stainless Steel 304 Corrosion-resistant general service Water, HVAC, chemical plant utilities Stainless Steel 316 Higher corrosion resistance — aggressive media Chemical plant, pharma, coastal, chloride service Carbon Steel High strength, high temp — non-corrosive service Oil, gas, steam, petrochemical process lines Seat Seal Material Options Seal Material Temperature Range Best For Typical Application EPDM -10°C to 120°C Water, hot water — most common in India Water supply, HVAC, STP, ETP, fire fighting NBR (Nitrile) -20°C to 80°C Oil, fuel, petroleum products Fuel lines, petroleum, oil handling systems Viton (FKM) -20°C to 180°C Chemical resistance, high temperature Chemical plant, solvents, acids, high temp service Metal Seat Up to 425°C Steam, high temperature, abrasive service Steam lines, power plant, high temp process Mounting Type Options Type Installation Best For Wafer Type Sandwiched between two flanges using through-bolts Most economical — both pipeline sides always connected Lug Type Threaded lugs bolt independently to each flange End-of-line service, one-side pipeline removal Technical Specifications – Dual Plate Check Valve Parameter Specification Product Type Dual Plate Check Valve (Double Door NRV / Split Disc Check Valve) Design Standard API 594 / IS 5312 Face to Face API 594 / BS EN 558 Testing Standard API 598 / IS 6157 Size Range 50mm to 600mm (2 inch to 24 inch) — larger on request Pressure Rating PN10 / PN16 / PN25 / Class 150 / Class 300 End Connection Wafer (between flanges) / Lug (threaded inserts) Hinge Pin Material Stainless Steel 316 Spring Material Stainless Steel 316 / Inconel (high temp) Flange Compatibility ANSI B16.5 / DIN / IS Standard Flanges Installation Horizontal and vertical (spring-loaded — all orientations) MOQ 10 Nos HSN Code 84812090 All Material Variants — Full Keyword Coverage Krishna Industries supplies the following Dual Plate Check Valve variants for Indian EPC and industrial projects: Cast Iron dual plate check valve wafer type PN16 supplier India. CI double door check valve EPDM seat supplier Ahmedabad. Ductile Iron dual plate NRV PN25 supplier Gujarat. Carbon steel WCB dual plate check valve Class 150 wafer type India. WCB dual disc check valve Class 300 supplier Ahmedabad. SS304 dual plate check valve CF8 Class 150 supplier India. SS316 dual plate check valve CF8M chemical plant supplier India. SS316 lug type dual plate NRV API 594 supplier Ahmedabad. Dual plate check valve EPDM seat water supply India. Dual plate check valve Viton seat chemical service India. Dual plate check valve metal seat steam line supplier India. Dual disc check valve 50mm to 600mm supplier India. Double door check valve PN10 PN16 supplier Ahmedabad Gujarat. Dual plate NRV wafer type EPC bulk supply India. API 594 dual plate check valve supplier India. IS 5312 dual plate check valve Ahmedabad Gujarat supplier. Where to Use Dual Plate Check Valve — Standard Piping Practice EPC piping engineers specify dual plate check valves at these standard locations: Pump discharge lines — 150mm and above — prevents backflow and protects pump impeller on shutdown Parallel pump systems — prevents backflow through the idle pump when standby pump starts High-velocity process lines — faster closure reduces water hammer on flow stoppage Vertical discharge lines — spring-loaded design operates reliably in all orientations including vertical upward flow Compressor and blower discharge — prevents reverse rotation on shutdown Fire fighting pump headers — dual plate design specified for positive closure under fire fighting flow conditions Booster pump stations — protects incoming main from pump discharge backflow Heat exchanger inlet lines — prevents thermosiphon reverse flow Applications in Indian Industries Municipal water supply pumping stations and rising mains Water treatment plants — pump discharge protection Sewage treatment and effluent treatment — lift station pump discharge Fire fighting systems — pump discharge headers HVAC chilled water and condenser water pump discharge Oil and gas pipeline pump and compressor stations Petrochemical plant process piping — WCB for hydrocarbon service Refinery crude and product transfer pump discharge Chemical plant corrosion-resistant service — SS304 / SS316 Pharmaceutical plant process utilities — SS316 Power plant cooling water and auxiliary systems Irrigation pumping stations — large bore discharge mains Sugar mills, cement plants, heavy industrial pump systems EPC Contractors — Bulk Dual Plate Check Valve Supply Dual Plate Check Valves are a standard BOM item in every EPC pumping station, water treatment plant, sewage treatment plant, and process piping project. Krishna Industries supports complete EPC project supply: Bulk quantity supply from MOQ 10 Nos upwards Multiple body materials in single consolidated order — CI, WCB, SS316 together Material Test Certificates (MTC) for all body grades Hydrostatic and seat leakage test certificates on request GST invoices — GSTIN: 24AKLPP6499B1ZT E-way bill and delivery challan for PAN India transport Fast dispatch from Ahmedabad — 2 to 5 working days standard grades Technical support for body material, seal, and type selection Competitive project-rate bulk pricing with confirmed lead times As a multi-product B2B supplier, Krishna Industries consolidates Dual Plate Check Valves with Single Plate Wafer Check Valves, Butterfly Valves, Ball Valves, Y Strainer Valves, Flanges, Pipe Fittings, and Fasteners in single orders — single GST invoice, single dispatch for EPC procurement efficiency. Purchase Managers and MRO Buyers MOQ 10 Nos — accessible for maintenance replacement quantities Exact spec matching — body material, size, pressure class, seal material confirmed before supply Replacement seal kits available separately for in-situ maintenance Consistent batch quality from verified manufacturers Fast repeat order processing — share previous PO details for quickest turnaround GST invoice with full documentation for accounts compliance PAN India Supply Coverage Maharashtra — Mumbai, Pune, Navi Mumbai, Nashik, Aurangabad, Nagpur Gujarat — Ahmedabad, Surat, Vadodara, Rajkot, Bharuch, Ankleshwar, Vapi, Dahej Rajasthan — Jaipur, Jodhpur, Udaipur, Kota, Bhilwara Delhi NCR — Delhi, Noida, Gurgaon, Faridabad, Ghaziabad Tamil Nadu — Chennai, Coimbatore, Madurai, Tirupur, Salem Karnataka — Bangalore, Hubli, Mysore, Belgaum, Mangalore Telangana and Andhra Pradesh — Hyderabad, Vizag, Vijayawada, Kakinada Madhya Pradesh — Indore, Bhopal, Jabalpur, Pithampur Punjab and Haryana — Ludhiana, Amritsar, Chandigarh, Panipat West Bengal — Kolkata, Durgapur, Asansol, Haldia Odisha, Jharkhand, Chhattisgarh — all industrial zones Export supply available FOB Mundra / JNPT for UAE, Saudi Arabia, Vietnam, and other markets. IEC registered exporter — IEC: AKLPP6499B. Quality and Documentation Material Test Certificate (MTC) from manufacturer Hydrostatic pressure test certificate Seat leakage test certificate — API 598 / IS 6157 Dimensional inspection records on request GST invoice — GSTIN: 24AKLPP6499B1ZT Industrial packaging with size, body material, pressure rating, and seal material labeling E-way bill and delivery challan for PAN India transport Related Products from Krishna Industries (KELOR) CI Wafer Check Valve (Single Plate) — economical NRV for smaller bore and lower velocity lines SS304 Wafer Check Valve — corrosion-resistant single plate NRV SS316 Wafer Check Valve — aggressive chemical and pharma service NRV PN10 / PN16 Butterfly Valve — isolation valve for pump discharge lines Lug Type Butterfly Valve — isolation with one-side pipeline access Y Strainer Valve — pipeline protection upstream of pump suction All available from Krishna Industries — single GST invoice, consolidated PAN India dispatch. Frequently Asked Questions 1. What is a dual plate check valve? A dual plate check valve has two spring-loaded semicircular plates (discs) hinged on a central pin. Under forward flow the plates open; when flow stops or reverses the spring snaps both plates shut immediately — preventing backflow, protecting pumps, and reducing water hammer. Also called Double Door Check Valve, Dual Disc NRV, or Split Disc Check Valve. 2. What is the difference between dual plate and single plate check valve? Dual plate has two smaller semicircular plates — faster closing speed, lower pressure drop, less water hammer, more compact. Single plate has one full circular plate — simpler, more economical for smaller sizes and lower velocity service. Use dual plate for 150mm and above pump discharge lines and high-velocity applications. 3. Why is dual plate preferred for large diameter pump discharge? In large diameter lines the single plate becomes heavy and slow to close — allowing reverse flow to build up before closure causing severe water hammer. The two smaller plates of a dual plate valve are lighter, travel half the distance, and close much faster — significantly reducing water hammer and pump damage risk. 4. Which body material for water and HVAC pump discharge? Cast Iron (CI) is most economical and widely used for water supply, HVAC, STP, ETP, and fire fighting pump discharge lines up to PN16. Ductile Iron for higher pressure water mains. 5. Which body material for oil, gas, and process service? WCB (Carbon Steel) for oil, gas, petrochemical, and steam service. SS304 for moderate chemical service. SS316 for aggressive chemical, pharmaceutical, and coastal applications. 6. Which seal for water service? EPDM is the standard seat seal for water, hot water, HVAC, and fire fighting applications across India. 7. Can dual plate check valve be installed vertically? Yes — the spring-loaded design allows reliable operation in horizontal, vertical upward flow, and vertical downward flow orientations. No orientation restriction unlike swing check valves. 8. What sizes are available? 50mm to 600mm (2 inch to 24 inch). Larger sizes available on project basis. 9. What is API 594? API 594 is the American Petroleum Institute standard for check valves — covering design, dimensions, testing, and material requirements. Dual plate check valves conforming to API 594 are accepted in Indian EPC oil and gas, petrochemical, and process piping projects. 10. Do you provide MTC and GST invoice? Yes — every order includes GST invoice (GSTIN: 24AKLPP6499B1ZT), Material Test Certificate, and hydrostatic test certificate. Seat leakage test certificates available on request. 11. What is the MOQ? MOQ is 10 Nos. Bulk project orders welcome with better pricing and confirmed delivery timelines. 12. Can I order dual plate check valves together with butterfly valves and flanges? Yes — Krishna Industries supplies dual plate check valves, single plate check valves, butterfly valves, ball valves, Y strainers, flanges, fittings, and fasteners in consolidated single orders — single GST invoice, single dispatch. Conclusion The Dual Plate Check Valve supplied by Krishna Industries (KELOR) is a reliable API 594 / IS 5312 compliant non-return valve — available in Cast Iron, Ductile Iron, WCB, SS304, and SS316 body — SS304 / SS316 plates — EPDM, NBR, Viton, and metal seat seals — sizes 50mm to 600mm — PN10, PN16, PN25, Class 150, and Class 300 — wafer and lug type. Sourced from verified Indian manufacturers and supplied with complete MTC, hydrostatic test certificate, GST documentation, and fast PAN India dispatch from Ahmedabad. For EPC contractors, purchase managers, MRO teams, and bulk buyers — contact Krishna Industries (KELOR), your trusted Dual Plate Check Valve supplier in Ahmedabad, Gujarat, India. WhatsApp your size, body material, seal, and quantity for bulk pricing within 2 hours.