MS Wafer Check Valve (NRV) — Mild Steel Body Manufacturer & Supplier India | KELOR, Ahmedabad

Also Available In — Other Body Materials

The MS Wafer Check Valve (also known as a Mild Steel NRV, MS Non-Return Valve, MS wafer type check valve, or wafer type NRV) is a compact single-plate backflow prevention valve designed to be clamped between two pipe flanges. The mild steel (WCB carbon steel) body provides higher pressure and temperature rating than cast iron, making it the preferred choice for steam lines, oil and gas utilities, compressed air systems, and higher-temperature water systems where CI would be inadequate.

Krishna Industries (KELOR Valves), Ahmedabad, manufactures and supplies MS body wafer check valves from 1″ to 24″ — ready stock in common sizes — with GST invoice, MTC on request, and pan India dispatch. Buyers also commonly compare this valve with our cast iron wafer check valves for cold-water duty and the stainless steel wafer check valve range for corrosive and hygienic service.

MS Wafer Check Valve Price List — Indicative (Ex-Ahmedabad)

Prices are indicative for standard MS body + SS disc + EPDM seat configuration at PN16 rating. Final price depends on quantity, disc/seat material, and delivery. WhatsApp for confirmed bulk pricing within 2 hours.

For a wider comparison across valve types, see our updated Industrial Valve Price List India 2026 — Ball, Gate, Check & Butterfly Rate Chart.

Technical Specifications — MS Body Wafer Check Valve

MS vs CI vs SS304 Wafer Check Valve — When to Specify Mild Steel

Most buyers default to Cast Iron (CI) wafer check valves for cost reasons — but MS (WCB carbon steel) is the correct specification in several common situations. Use this guide to choose correctly.

And when is SS304 the right choice? Specify the SS304 (CF8) wafer check valve or SS316L body when the media itself is corrosive or hygiene-critical — chemicals, pharma, food and beverage, marine or coastal plants, and demineralized water loops. Stainless costs more than MS but resists internal corrosion without coatings. A cost-effective middle path many EPC buyers use is an MS body with SS304 or SS316 disc and EPDM seat — the wetted moving part is stainless while the pressure-holding body stays carbon steel. For a deeper technical walkthrough, see our guide on stainless steel grades for valves — 304, 316, CF8, CF8M.

Seat Material Selection — EPDM vs NBR vs PTFE

Applications — Where MS Wafer Check Valves Are Used

How an MS Wafer Check Valve Works

The MS body wafer check valve operates entirely automatically — no actuator, handwheel, or external signal required:

• Forward flow: Upstream pressure exceeds downstream pressure → spring-loaded disc opens → fluid flows through
• Flow stop / reversal: Upstream pressure drops below downstream → spring closes disc before flow reverses → backflow is prevented
• Water hammer prevention: Spring-assisted fast closure means the disc closes before a significant reverse flow velocity builds up — this eliminates the pressure spike (water hammer) that causes pipeline damage and noise in swing check valves
• Installation: Clamped between two pipe flanges using standard bolts — no special bolting required. Flow direction arrow on valve body must point in the direction of desired forward flow

Comparing valve styles before you order? See the full technical comparison wafer check valve vs swing check valve, or the beginner-friendly explainer what is a wafer check valve.

Installation Guidelines — MS Wafer Check Valve

Correct installation is what protects your pump and pipeline — most wafer check valve failures on site trace back to one of the steps below being skipped:

1. Check the flow arrow printed on the valve body before lifting it into position — it must point in the direction of intended forward flow (normally away from the pump, on the discharge side).
2. Match the flanges. The valve sits between two standard ANSI, DIN, or IS flanges of the same size and rating as the valve (PN10/PN16 or ANSI 150). Flange faces should be clean and undamaged.
3. Fit a full-face flat gasket on both sides of the valve body. The wafer body has no flange drilling of its own — the gaskets seal against the pipe flange faces.
4. Align before tightening. Bring the flanges together squarely so the valve body is not cocked or stressed, then hand-tighten all bolts.
5. Tighten diagonally in stages (cross-pattern), increasing torque gradually over 2–3 passes so the body seats evenly and the gaskets compress uniformly.
6. Mind the orientation. Horizontal pipelines are preferred. Vertical installation is acceptable only with upward (bottom-to-top) flow — never install a wafer check valve in a vertical line with downward flow.
7. Avoid severe turbulence at the inlet where practical — where space allows, keep a short straight pipe run between the valve and the nearest pump nozzle, elbow, or reducer.
8. Pressure-test the joint at commissioning and re-check bolt tension after the first thermal cycle on steam or hot-water lines.

For the complete walkthrough with vertical-pipeline rules and common mistakes, read our wafer check valve flow direction and installation guidelines.

Maintenance & Troubleshooting — MS Wafer Check Valve

MS wafer check valves are low-maintenance because the disc, spring, and seat are the only moving parts, but a routine check keeps them slam-free and leak-tight:

• Disc chatter or flutter: A rattling or hammering sound during operation usually means flow velocity is too low for the size installed, or the valve is oversized for the duty. Confirm the line flow rate against the valve size — an oversized wafer check valve never fully opens and wears its seat unevenly.
• Leakage past the seat: Backflow or a dripping discharge points to a worn or swollen soft seat. EPDM seats swell in oil service; NBR hardens in hot water. Replace the seat with the correct media-compatible material — see the seat selection table above.
• Sluggish closure: A fatigued or fouled spring closes the disc late and lets reverse flow start. Inspect the spring and disc pin during planned shutdowns and replace the spring if the disc does not snap back freely by hand.
• Body and coating check: On carbon steel bodies, inspect the external coating and internal bore for rust scale during shutdowns, especially on untreated water loops. Re-coat or specify epoxy coating when renewing.
• Keep a spare seat-and-spring kit for critical pump-discharge lines — the soft parts are inexpensive relative to pipeline downtime.
• Re-verify the flow arrow whenever the valve is removed and refitted after maintenance — reversed installation is the single most common field error with wafer check valves.

Why Contractors & Traders Choose KELOR for MS Wafer Check Valves

Pan India Supply — MS Wafer Check Valve

Krishna Industries dispatches MS body wafer check valves from Ahmedabad to all major cities and states: Mumbai, Pune, Nashik, Nagpur (Maharashtra) · Chennai, Coimbatore (Tamil Nadu) · Bengaluru, Hubli (Karnataka) · Hyderabad, Visakhapatnam (Telangana & Andhra) · Delhi, Noida, Gurugram, Faridabad, Ludhiana (Delhi NCR & Punjab) · Kolkata, Bhubaneswar (East India) · Jaipur, Indore, Bhopal, Lucknow, Kanpur (Central & North India) · Surat, Vadodara, Rajkot, Vapi (Gujarat) and all other industrial cities across India. Export enquiries (FOB Mundra/Nhava Sheva) welcome.

Frequently Asked Questions — MS Wafer Check Valve (NRV)

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