Wafer Swing Check Valve | CI WCB SS304 SS316 | Gravity Closure | DN50–DN600 | PN16 Class 150 | Supplier India

Description

Wafer Swing Check Valve Supplier India | CI / WCB / SS304 / SS316 | Gravity Closure | DN50–DN600 | PN16 / Class 150 | API 594 | KELOR

Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 10 Nos | Closure: Gravity — no spring
Standard: API 594 / BS 5153 | Sizes: DN50–DN600 | Rating: PN10–Class 300

Wafer Swing Check Valve Supplier in India

Krishna Industries (KELOR), based in Ahmedabad, Gujarat, is a B2B supplier of Wafer Swing Check Valves — Cast Iron (CI), WCB (carbon steel), CF8 (SS304), and CF8M (SS316) body — swing disc with gravity closure — no spring — rubber-faced or metal-to-metal disc — wafer body between flanges — DN50 to DN600 — PN10 / PN16 (CI) / Class 150 / Class 300 (WCB / SS) — API 594 / BS 5153 — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad.

The wafer swing check valve is the correct non-return valve for large bore horizontal pipelines at low to moderate flow velocity — where gravity closure (no spring) gives near-zero cracking pressure, allowing the valve to open even at very low forward flow velocity without spring resistance. The slim wafer body fits between standard pipe flanges — lighter and more economical than a flanged-body swing check valve with the same disc mechanism. The absence of a spring is the defining characteristic — it is also the primary limitation: wafer swing check valves are horizontal pipeline only — they do not function reliably in vertical pipelines where the disc cannot close by gravity.

Swing Check Valve — How Gravity Closure Works and Why It Matters

In a wafer swing check valve, the disc is hinged at the top of the body and swings freely. There is no spring. When forward flow pressure exceeds the disc weight, the disc swings open — the cracking pressure is essentially the pressure required to lift the disc weight, which at large bore is very low. When flow stops, gravity pulls the disc downward and reverse pressure pushes it closed against the seat. The closure speed depends on how fast the flow decelerates and how heavy the disc is — heavier discs at large bore close faster under gravity.

This is why swing type is preferred for large bore, low velocity, horizontal service — and why spring-assisted types are preferred for high-velocity pump discharge and vertical pipelines where reliable fast closure is critical.

Swing Check vs Spring-Assisted Disc vs Spring Loaded Poppet

Body Material Comparison

Technical Specifications

Applications in Indian Industries

• Municipal water supply mains — large bore — CI PN16 EPDM disc — DN200 to DN600 — gravity-fed distribution mains, pumping station discharge headers where flow velocity is low and water hammer risk is manageable — IS 14846 compliant
• Irrigation pump stations — CI PN10/PN16 — large bore horizontal pump discharge — DN200–DN400 — low head pumping, canal distribution, agricultural water supply — near-zero cracking pressure ideal for low-head low-velocity systems
• Water treatment plant — inlet and distribution — CI PN16 — raw water inlet channel valves, treated water distribution headers — horizontal large bore service at moderate velocity
• Cooling water systems — industrial plants — CI or WCB — cooling tower return headers, condenser cooling water discharge — large bore horizontal, steady flow, low velocity — swing closure adequate, spring resistance not desirable
• HVAC — large bore building services — CI EPDM — DN150–DN300 chilled water and condenser water horizontal mains in large commercial buildings and industrial HVAC plants
• ETP and STP — CI EPDM — treated effluent discharge headers, sludge recirculation horizontal mains — large bore, low velocity, horizontal
• Chemical plant — SS316 body — CF8M Class 150 — horizontal chemical transfer headers where CI or WCB body corrodes and spring resistance at large bore is undesirable — low velocity gravity-assisted flow
• Power plant auxiliary water — WCB Class 150 — service water, make-up water, ash handling water horizontal mains — large bore, steady flow

Related Products — Krishna Industries (KELOR)

• Single Plate Wafer Check Valve — spring-assisted — horizontal AND vertical upward — DN40–DN300 — for pump discharge where fast spring closure is required
• Dual Plate Check Valve — CI / WCB — spring torsion — DN50–DN600 — lower pressure drop than swing at large bore — horizontal and vertical upward
• Spring Loaded Silent Check Valve — poppet type — zero water hammer — vertical downward flow — boiler feed — compressor outlet
• Cast Iron Foot Valve — suction line NRV for pump priming — borewell and sump applications
• Disc Check Valve — All NRV Types — full selection guide for choosing the right check valve type for your application

Frequently Asked Questions

1. Why does a wafer swing check valve not work in vertical pipelines?

A swing check valve closes by gravity — the disc swings downward and back against the seat when flow stops. In a vertical pipeline with upward flow, the disc hangs in the fully open position under gravity and only closes when reverse pressure pushes it back — by then, significant backflow has already occurred. In vertical downward flow, the disc falls fully open and cannot close at all. For vertical pipelines in either direction, specify a spring-assisted disc type (single plate or dual plate) for upward flow, or a spring loaded silent (poppet) type for downward flow.

2. Is swing type suitable for pump discharge?

Swing type is suitable for large bore, low velocity, horizontal pump discharge where the pump stops gradually and water hammer is not a concern — for example, large irrigation pump stations or gravity-fed distribution systems. For high-velocity pump discharge where the pump trips suddenly — fire pumps, boiler feed pumps, HVAC chilled water pumps — spring-assisted single plate or dual plate is the correct specification. The faster spring-assisted closure prevents the velocity reversal that causes water hammer.

3. What is the difference between wafer swing and flanged swing check valve?

Both use the same swing disc mechanism — gravity closure, no spring. The difference is body construction. A flanged swing check valve has integral flanges cast onto the body — thicker, heavier, longer face-to-face, higher cost. A wafer swing check valve has a slim body that fits between two pipe flanges using through-bolts — thinner, lighter, lower cost, same disc mechanism. For standard in-line industrial pipelines, wafer type is preferred for cost and space. Flanged type is specified where the valve must be self-supporting or for underground/buried service.

4. When should I use swing type instead of dual plate?

Dual plate (spring torsion) is the standard recommendation for DN200 and above in most Indian industrial applications — it gives lower cracking pressure, lower pressure drop, and faster closure than a single plate, with spring-assisted closure preventing water hammer. Swing type is specified when spring resistance to opening must be eliminated entirely — very low head gravity systems where even torsion spring resistance would prevent the valve from opening. For most Indian pump discharge applications, dual plate is the better choice at large bore.

5. What is the MOQ?

MOQ is 10 Nos. Project orders for water treatment, municipal, irrigation, or industrial cooling water — 10 to 200+ Nos across sizes — with hydro test reports and API 598 certificates. WhatsApp body material, size list, pressure class, and quantity for bulk pricing within 2 hours.

Conclusion

The Wafer Swing Check Valve supplied by Krishna Industries (KELOR) is the gravity-closure non-return valve for large bore horizontal pipelines at low to moderate flow velocity — CI (PN10/PN16), WCB (Class 150/300), CF8 (SS304), and CF8M (SS316) body — swing disc, rubber-faced or metal-to-metal — wafer body between flanges — DN50 to DN600 — API 594 / BS 5153 — API 598 tested. Horizontal installation only — not suitable for vertical pipelines. For vertical upward flow specify single plate or dual plate with spring. For vertical downward flow specify spring loaded silent (poppet) type. GST invoice, Pan India dispatch from Ahmedabad. WhatsApp body material, size, pressure class, and quantity for bulk pricing within 2 hours.