1 Inch Single Plate Check Valve | CI Body Nitrile NBR Seat MS Disc | DN25 Wafer NRV | Supplier India

Description

1 Inch Single Plate Check Valve Supplier India | CI Body | NBR Nitrile Seat | MS Disc | DN25 Wafer NRV | KELOR

Supplier: Krishna Industries (KELOR) – Ahmedabad, Gujarat, India
Established: 2017 | GSTIN: 24AKLPP6499B1ZT | IEC: AKLPP6499B
MOQ: 10 Nos | Size: DN25 (1 inch) standard — DN15 to DN50 available
Body: Cast Iron (CI) | Seat: Nitrile (NBR) | Disc: Mild Steel (MS)

1 Inch Single Plate Check Valve — CI Body NBR Seat — Supplier in India

Krishna Industries (KELOR), based in Ahmedabad, Gujarat, is a B2B supplier of the Single Plate Check Valve in 1 inch (DN25) — Cast Iron (CI) body — Nitrile (NBR) seat — Mild Steel (MS) disc — SS304 spring — wafer type — PN16 — API 594 / BS 5153 — GST invoice — MOQ 10 Nos — Pan India dispatch from Ahmedabad. Full range DN15 (½”) to DN50 (2″) in CI/NBR/MS available from stock. EPDM seat and SS disc variants on request.

The 1 inch single plate wafer check valve — CI body, NBR nitrile seat, mild steel disc — is the correct small bore non-return valve for oil, fuel, diesel, hydraulic fluid, and general utility service where cost is a priority and media is non-corrosive. The nitrile (NBR) seat is specifically chosen for oil and fuel compatibility — it resists swelling and degradation in hydrocarbon media where EPDM (the standard water service seat) would swell and fail. The mild steel disc is the economical choice for non-corrosive utility media where SS disc is over-specified.

Small Bore Check Valve — Size Guide in Inches

For DN65 (2½”) and above: See the Single Plate Wafer Check Valve page for full industrial range DN40–DN300 with all material options.

Nitrile (NBR) vs EPDM Seat — Which to Specify

MS Disc vs SS Disc — When MS is the Correct Choice

Important: If your service medium is water — even intermittent water contact — specify SS304 disc instead of MS. MS disc in water service will rust, produce rust particles downstream, and eventually seize or fail to seal. MS disc is the correct specification only for oil, fuel, and dry utility service.

Technical Specifications

Applications — Where CI Body NBR Nitrile MS Disc Is Correct

• Diesel day tank systems — 1 inch to 1½ inch CI NBR MS — pump discharge NRV on diesel day tank fuel transfer pumps in generator rooms, DG sets, industrial facilities — NBR seat handles diesel without swelling, MS disc acceptable for diesel service
• Hydraulic power packs — DN25 CI NBR — hydraulic oil return line NRV — NBR compatible with hydraulic mineral oil — prevents backflow through pump when system pressure holds load
• Lube oil systems — DN25 CI NBR — lube oil pump discharge — prevents oil drain-back when pump stops — NBR correct for lubricating oil media
• Fuel transfer pump discharge — DN25 to DN40 CI NBR MS — HSD, kerosene, and furnace oil transfer lines — small bore fuel transfer in industrial plants
• Small compressor outlet (oil-lubricated) — DN25 CI NBR — oil-flooded screw compressor outlet check valve — NBR handles trace oil in compressed air from oil-lubricated compressors
• Industrial utility lines (non-aqueous) — general purpose CI NBR MS for non-corrosive utility service where lowest cost is the priority

Related Products — Krishna Industries (KELOR)

• Single Plate Wafer Check Valve — Full Industrial Range — DN40 to DN300, CI/DI/WCB/SS304/SS316 body, EPDM/NBR/PTFE/metal seat, PN10/PN16/Class 150 — for pump discharge, fire fighting, HVAC, water supply
• Spring Loaded Wafer Check Valve — Nozzle/Poppet Type — silent check valve for high-velocity, boiler feed, compressor outlet, vertical downward flow
• CI Wafer Check Valve — CI body EPDM seat SS disc — standard specification for water service
• Y Strainer Valve — install upstream of all check valves to protect disc seat from debris

Frequently Asked Questions

1. Why is nitrile (NBR) seat specified instead of EPDM for this valve?

Nitrile (NBR) is resistant to oil, diesel, fuel, and hydrocarbon media — it does not swell or degrade in oil contact. EPDM (the standard seat for water service) swells significantly in oil and fuel contact within weeks, causing the seat to deform and lose its sealing ability. If your application involves diesel, lube oil, hydraulic fluid, or any petroleum product, specify NBR seat. If your application is water, specify EPDM.

2. Can the MS disc be upgraded to SS304 or SS316?

Yes — SS304 disc and SS316 disc are available on request for the same CI body NBR seat valve. If your service involves water, acidic media, or any application where rust particles downstream are not acceptable, specify SS304 disc instead of MS. MS disc is the correct choice only for oil and fuel service where water contact is absent.

3. Is this valve available in screwed end (BSP) for small bore?

Screwed end (BSP threaded) NRV is available for DN15 to DN50 — specify at inquiry. Screwed end is used where flanged piping is not present — domestic pump connections, borewell rising main top connection, instrument impulse lines. Wafer type (this product) requires flanged piping on both sides. Confirm end connection requirement when ordering.

4. What is the difference between single plate and dual plate check valve?

Single plate has one disc and one spring — simpler, lower cost, available from DN15 upward. Dual plate has two half-discs and two springs — higher Cv, lower pressure drop, faster closure — specified for DN200 and above or high-flow low pressure drop service. For DN25 (1 inch) service, single plate is always the correct specification — dual plate is not practical at small bore.

5. Is this suitable for borewell pump discharge?

For a borewell with a surface-mounted centrifugal pump drawing through a suction pipe, a foot valve at the suction end is the primary backflow prevention device — the check valve at pump discharge is secondary. Specify EPDM seat (not NBR) for borewell water service. This product with NBR seat is for oil and fuel service — specify EPDM seat variant for water service borewell installation.

6. What is the MOQ?

MOQ is 10 Nos. Mixed size orders accepted — for example 5 Nos DN25 + 5 Nos DN40 = 10 Nos total. WhatsApp size, seat material, disc material, and quantity for pricing within 2 hours.

Conclusion

The 1 inch Single Plate Check Valve — CI body, Nitrile (NBR) seat, Mild Steel (MS) disc — supplied by Krishna Industries (KELOR) is the correct small bore NRV for diesel day tank, lube oil, hydraulic fluid, fuel transfer, and oil-service pump discharge applications — DN25 (1 inch) standard, full range DN15 to DN50 available — wafer type PN16 — SS304 spring — API 594 — API 598 tested. EPDM seat and SS disc variants available on request for water service. GST invoice, fast dispatch from Ahmedabad. WhatsApp size, seat, disc material, and quantity for pricing within 2 hours.

Additional information