Wafer Double Flap Swing Check Valve

Check Valve

※ Product model: H76H/W
※ Nominal diameter: DN50mm-1400mm
※ Nominal pressure: PN1.0MPa-25.0MPa, 150LB-900LB
※ Applicable medium: water, gas, oil
※ Applicable temperature: -20℃-425℃
※ Body material: carbon steel, stainless steel, etc.
※ Design standard: GB/T12221, API6D, API594

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Description

Wafer Double Flap Swing Check Valve – Overview

The wafer double flap swing check valve is designed for reliable backflow prevention in medium and large diameter pipelines while maintaining a compact and lightweight structure. Its double-door disc design allows for smooth, low-resistance opening during forward flow and rapid closure when reverse flow is detected, minimizing water hammer and pressure surges. The wafer body construction makes it suitable for installations with limited space between flanges.

Key Design Features

Wafer-Type Body
Slim profile for easy installation between standard pipeline flanges, reducing weight and material cost compared to full-bodied check valves.
Dual Flap Disc Assembly
- Each flap operates independently to reduce the force required for opening.
- Torsion springs ensure quick closing to prevent reverse flow.
Low Pressure Drop
Streamlined internal passage minimizes turbulence and energy loss.
Materials
- Body: Carbon steel, stainless steel, or ductile iron.
- Discs: Stainless steel or alloy steel for corrosion and wear resistance.
- Springs: Stainless steel for fatigue resistance.
Standards Compliance
Built according to API 6D or EN 12334, with face-to-face dimensions per API 594 or ISO 5752.

Applications

Water Supply & Distribution Systems – Prevents reverse flow in pump stations and distribution pipelines.
Marine & Offshore Piping – Compact form factor is ideal for restricted spaces.
HVAC Systems – Ensures directional flow in chilled and hot water circuits.
Oil & Gas Pipelines – Suitable for non-corrosive and mildly corrosive hydrocarbon service.

Advantages

Space-Saving Design – Ideal for retrofit projects or systems with short pipeline lengths.
Reduced Water Hammer – Dual flap and spring-assisted closure minimize pressure surges.
Lightweight Construction – Easier handling and installation compared to traditional swing check valves.
Versatile Material Options – Adaptable to a range of fluids and temperature conditions.

With over 15 years of professional expertise, YIXIN has been specializing in manufacturing industry-specific flow control solutions – particularly industrial valves – catering to sectors such as oil & gas, chemical engineering, power stations, water supply, and energy.
Equipped with state-of-the-art facilities and a comprehensive manufacturing system, YIXIN delivers high-quality industrial valves, including pneumatic actuated ball valves, DBB valves, and top entry ball valves.

We have cooperated with experienced shipping forwarders for many years, they arrange the shipment. No matter by express, by air or by sea, we will track the course of the goods all the way, to make sure goods arrive at you on time and in good condition.

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Wafer Double Flap Swing Check Valve

yixin@yixin-valve.cn