Swing Check Valve

Wafer Type Check Valve

A wafer type check valve is a compact, lightweight, non-return valve designed to allow fluid flow in one direction and automatically prevent reverse flow. It is installed between two pipe flanges, making it suitable for systems where space and weight are important considerations.

Construction

A typical wafer type check valve consists of:

Valve body (wafer-shaped)

Disc or dual plates

Hinge pin

Spring mechanism (in spring-loaded designs)

Seat

Working Principle

When fluid flows in the intended direction, the disc or plates open due to flow pressure.

When flow stops or reverses, the spring and/or back pressure forces the disc to close.

The closed disc prevents backflow, protecting pumps, compressors, and other equipment.

Features

Compact and lightweight design

Easy installation between flanges

Low pressure drop

Quick closing action

Minimal maintenance requirements

Suitable for horizontal and vertical pipelines (depending on design)

Advantages

Saves installation space

Lower cost compared to larger swing check valves

Reduces water hammer effects in spring-assisted models

Available in various materials for different fluids and environments

Applications

Water supply systems

HVAC systems

Pump discharge lines

Chemical processing plants

Oil and gas pipelines

Fire protection systems

Wastewater treatment plants

Types of Wafer Check Valves

Single Disc Wafer Check Valve

Dual Plate (Double Door) Wafer Check Valve

Spring-Loaded Wafer Check Valve

Silent Check Valve

Materials Commonly Used

Cast Iron

Ductile Iron

Carbon Steel

Stainless Steel

Bronze

Conclusion

A wafer type check valve is an efficient and economical solution for preventing reverse flow in piping systems. Its compact design, ease of installation, and reliable operation make it widely used across water, industrial, HVAC, and process applications.