Wafer Swing Check Valve supplier in Ahmedabad, Gujarat. Cast Iron (CI), WCB, SS304 (CF8), SS316 (CF8M) body — swing disc — gravity closure (no spring) — rubber-faced or metal-to-metal disc — wafer type between flanges — DN50 to DN600 —…
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
Feature
Wafer Swing Check (This Product)
Single / Dual Plate (Spring-Assisted Disc)
Spring Loaded Silent (Poppet / Nozzle)
Closure Mechanism
Gravity + reverse pressure — no spring
Spring-assisted disc — spring closes disc when flow stops
Heavy spring closes poppet before flow reverses
Cracking Pressure
✅ Near zero — no spring to overcome — opens at very low flow velocity
Low — must overcome spring force to open
Medium — must overcome heavy spring to open
Closure Speed
Slow — gravity only — depends on disc weight and flow deceleration
✅ Fast — spring assists rapid closure
✅ Fastest — closes before flow reverses
Water Hammer Risk
Higher — slow closure allows flow reversal before disc seats
Low — spring closes disc quickly
✅ Zero — closes before any flow reversal
Horizontal Pipeline
✅ Yes — standard installation
✅ Yes
✅ Yes
Vertical Upward Flow
❌ Not recommended — disc hangs open, may not close reliably without reverse pressure
✅ Yes — spring closes disc against gravity
✅ Yes — heavy spring holds poppet closed
Vertical Downward Flow
❌ Not suitable — disc falls fully open, cannot close
❌ Not suitable — disc falls open
✅ Only type suitable — spring keeps poppet closed against gravity
Pressure Drop (open)
✅ Low — disc swings fully clear of flow path
Low — disc folds away from flow path
Higher — nozzle restricts bore area
Best For
✅ Large bore horizontal, low velocity, gravity-fed, irrigation main, water treatment inlet
✅ Standard pump discharge DN40–DN600, HVAC, fire fighting, horizontal and vertical upward
✅ Boiler feed, compressor, vertical downward, high velocity, zero water hammer required
Cost
✅ Low — simple mechanism, no spring component
Low to medium
Higher — precision machined poppet
Body Material Comparison
Body Material
Pressure Rating
Media
Specify For
Cast Iron (CI) ASTM A126 / IS 210
PN10 / PN16
Water, HVAC, sewage, general utility
✅ Most economical — municipal water supply, irrigation, ETP, cooling water, fire fighting — most common Indian specification for large bore water service
WCB (Carbon Steel) ASTM A216 WCB
Class 150 / Class 300
Water, steam, process utility, oil, mild chemical
Higher pressure industrial service — process plant, power plant cooling water headers, steam condensate recovery — where CI pressure rating is insufficient or CI excluded by project spec
CF8 (SS304) ASTM A351 CF8
Class 150 / Class 300
Corrosive water, food, pharma, dilute chemical
Corrosion-resistant service — pharma process water, food and beverage, coastal fresh water — where CI or WCB corrodes
CF8M (SS316) ASTM A351 CF8M
Class 150 / Class 300
Chemical, seawater, chloride, aggressive media
Chemical plant, marine, coastal seawater, chloride-rich service — molybdenum addition gives better pitting resistance than CF8
Technical Specifications
Parameter
Specification
Valve Type
Wafer Swing Check Valve — gravity closure — no spring
CI with EPDM / NBR face (standard) / SS304 / SS316
Hinge Pin
SS304 / SS316
Seat
Machined body seat — rubber-faced disc (soft seat) / metal-to-metal
End Connection
Wafer — between EN 1092-2 (PN) / ASME B16.5 (Class) flanges
Size Range
DN50 to DN600 (2″ to 24″)
Pressure Rating
PN10 / PN16 (CI) — Class 150 / Class 300 (WCB / SS)
Installation
Horizontal ONLY — not suitable for vertical pipelines
Flow Direction
Marked on body — must be observed during installation
MOQ
10 Nos
HSN Code
84814000
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
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.
