Corrosion Resistant Wafer Silent Check Valve Metallic Seat PN16 Quiet Check Valve

Working Pressure:16kg/cm²
Shell Test Pressure:24kg/cm²
Seat Test Pressure:18kg/cm²

Media:Water,Neutral Oil
Working Temperature:0-52°C 1

00％ Fusion Bonded Epoxy Coating for Inner and Outside Surface

Size:DN50--DN200

The Hidden Failure Mode — Corrosion Inside a Check Valve

A check valve's defining feature — the freely swinging disc — is also its single point of failure. If corrosion seizes the hinge pin, the disc cannot close. If corrosion eats through the disc body, it loses balance and fails to seat. If internal corrosion builds tuberculation, it physically blocks the swing path. All three failures share the same condition: the pump stops, forward flow decays, reverse flow begins — but the check valve, corroded and frozen, does not close. The pump spins backwards. The pipeline drains. In a fire protection system, the jockey pump cannot maintain pressure. In a process loop, the entire batch is contaminated with backflow. In a building, the basement floods. Corrosion inside a check valve is not a cosmetic issue — it is a functional failure waiting to happen. The Model 2212W is engineered specifically to prevent it.

Product Overview

The Model 2212W is a corrosion-resistant wafer silent check valve with metallic gunmetal seat, PN16 rated, DN50–DN200. It takes the proven short-stroke silent swing geometry of the Model 2212 platform and packages it in a compact wafer body that mounts directly between EN1092 PN10/PN16 or ANSI B16.5 Class 150 pipe flanges. The corrosion-resistant construction is the valve's defining engineering statement: SS304 swing arm, SS304 hinge pin, SS304 disc core with gunmetal seat face, 100% fusion bonded epoxy coating on all body surfaces at 250 um DFT — every single wetted surface is either inherently corrosion-resistant (stainless steel, gunmetal) or protected by an impermeable, spark-tested FBE barrier. There is no galvanised steel in the hinge. There is no bare iron in the flow path. There is no unprotected surface that can initiate the corrosion cascade that ultimately seizes a check valve. Manufactured by Shandong Huaze Valve Co., Ltd. (ISO 9001, since 1998), every valve is individually hydro-tested (24 bar shell, 18 bar seat) and spark-tested (3 kV, full surface) before leaving the factory.

How Corrosion Kills a Check Valve — And How the 2212W Prevents It

Key Features

Full Stainless Steel 304 Internal Assembly — The Heart of Corrosion Resistance

Every moving internal component is austenitic stainless steel 304: the swing arm, the hinge pin, the disc core. This is the single most important design decision in the 2212W. In a typical budget check valve, the hinge pin is steel — sometimes nickel-plated, sometimes galvanised, but always vulnerable. Once the plating develops a pinhole — and in turbulent, oxygenated water, it always does — galvanic corrosion between the steel pin and the cast iron body accelerates, and within months the hinge seizes. The 2212W eliminates this failure path entirely. SS304 is inherently passive in water — it forms a self-healing chromium oxide layer that prevents corrosion without coatings, without platings, without sacrificial anodes. An SS304 hinge pin running in an SS304 swing arm bore, submerged in treated water, will operate freely for decades.

Gunmetal Seat Ring — The Industrial-Grade Alternative to EPDM

An EPDM resilient seat provides bubble-tight zero leakage — but EPDM has limits. It degrades at elevated temperatures. It swells in certain oils. Suspended abrasive particles — sand, scale, corrosion debris from upstream pipework — embed in the EPDM surface and create permanent leak paths. A gunmetal (bronze) seat ring does none of these things. It is dimensionally stable across the full 0–52°C operating range. It is chemically compatible with neutral oils as well as water. Its surface hardness resists abrasive scoring. The SS304 disc rim mates against the gunmetal ring to achieve EN 1074-3 Rate A seal performance — tight enough for industrial water and neutral oil service — with the mechanical toughness to survive years of normal operational cycling without degradation. For process water loops, cooling tower circuits, factory water distribution, and oil transfer lines, metallic seat durability is the right engineering choice.

100% FBE Coating — Verified by Spark Test on Every Valve

Fusion bonded epoxy is the corrosion protection standard for ductile iron water valves worldwide — but only if it is applied correctly. The 2212W's FBE coating is electrostatically applied at minimum 250 um dry film thickness on every internal and external surface, then oven-cured to achieve full cross-linking. After curing, every single valve undergoes a 3 kV spark test (holiday detection) across the entire coated surface. A holiday — a pinhole, a thin spot, a missed area — is detected instantly and the valve is rejected. This is not a statistical quality control process where 1 in 10 valves is tested; it is a 100% verification that every valve that ships has an intact, impermeable FBE barrier. For a check valve that may sit idle and water-filled for months between pump cycles, the certainty of a verified coating is the difference between a valve that wakes up and closes when called — and one that has quietly rusted into a seized-open position.

Wafer Body — Compact, Lightweight, Universal Fit

The wafer body design eliminates integral flanges — the valve is a compact disc that inserts between two standard pipe flanges and is retained by the pipework's own stud bolts. The face-to-face dimension is approximately 25% of an equivalent flanged check valve; the weight is approximately 35%. This makes the 2212W the ideal check valve for: (1) compact plant rooms where pipe gallery length is limited, (2) factory-assembled pump skids where every millimetre and kilogram counts, (3) retrofit installations where an existing flanged valve has failed and the replacement must fit the existing flange gap without pipe modification, and (4) any DN50–DN200 application where the cost and space benefits of wafer over flanged are significant. The wafer body fits between EN1092 PN10/PN16 and ANSI B16.5 Class 150 flanges — dual-standard compatibility for international projects.

Silent Short-Stroke Swing — Quiet Enough for Occupied Buildings

The short-stroke swing geometry — the engineering signature of the 2212 platform — reduces the disc's angular travel from fully open to seated. Less travel distance = faster closure = disc arrives at the seat before reverse flow velocity has built = lower impact energy. While a metallic seat by its nature produces a detectable sound on closure (a sharp click rather than the muffled thud of an EPDM seat), the short-stroke design ensures that the click is a contained mechanical event — not a full-velocity slam that rings through connected pipework and into building structures. For plant rooms within occupied buildings, for pump stations under residential streets, and for any installation where chronic water hammer damage to pipe supports and flanges is the real cost concern, the short-stroke silent geometry provides acoustic performance that is a clear step above a standard full-stroke commercial swing check.

DN50–DN200 — The Sweet Spot for Wafer Check Valves

The 2212W is offered in DN50 through DN200 — the size range where wafer check valves deliver the greatest value. Below DN50, the space and weight savings of wafer over flanged are marginal. Above DN200, the weight of the wafer body requires the pipe flanges to carry more load than they are typically designed for, and a flanged body with integral bolting is the better engineering choice. DN50–DN200 covers the vast majority of building services, process water, and irrigation pump discharge applications: the booster pump in an apartment basement (DN65), the cooling water pump in a factory (DN100), the jockey pump on a fire system (DN50), the irrigation pump at a golf course (DN80–DN150). The 2212W is engineered precisely for this operational sweet spot.

Materials of Construction — Corrosion-Resistant by Design

Technical Data

Applications — Where Corrosion Resistance Matters Most

• Industrial Process Water Loops: Factory cooling water, process water recirculation, wash water systems. Water quality is often variable — slightly acidic, slightly alkaline, containing dissolved salts or trace chemicals from the process. The all-SS304 internal assembly resists chemical attack that would aggressively corrode a standard iron/steel hinge in months.
• Neutral Oil Transfer Lines: Lubricating oil, hydraulic oil, heat transfer oil (neutral, non-corrosive grades). The gunmetal seat ring is oil-compatible — no swelling, no softening, no degradation. The SS304 disc and hinge are impervious to oil contact. An EPDM seat in the same service would swell and fail.
• Building Services — MEP Plant Rooms: Chilled water, condenser water, domestic water booster pumps in commercial buildings. Space constraints make the wafer body essential — and the corrosion-resistant construction ensures reliable closure over decades of seasonal cycling with extended idle periods.
• Fire Protection Jockey Pump Discharge: Jockey pumps cycle frequently to maintain system pressure. Each cycle is a check valve closure event. A corroded hinge that seizes open during a fire event means the main pump discharge flows backwards into the jockey line — a fire protection system failure. The 2212W's SS304 hinge assembly eliminates this risk.
• Packaged Pump Skids & OEM Equipment: Pump manufacturers and skid builders specifying check valves for factory-assembled units. The wafer body reduces skid length and weight; the corrosion-resistant internals mean fewer warranty claims for seized check valves; the FBE coating means no external rust during ocean freight or outdoor storage.
• Irrigation Pump Stations: Agricultural and landscape irrigation pump stations where water may carry dissolved fertilisers, soil minerals, or brackish groundwater. The metallic seat and SS304 internals handle variable water chemistry that would attack standard components.
• Retrofit & Replacement: When an existing check valve has failed due to corrosion — the most common failure mode — the replacement must not fail the same way. The 2212W's full corrosion-resistant design means the replacement is a permanent fix, not a repeat of the original specification's weakness.