Wafer Swing Check Valve

The wafer swing check valve allows flow in one direction, sealing inside with a soft gasket to prevent backflow in the pipelines. You can easily implement these valves in many applications.

Usually, wafer swing check valves stop fluid backflow by using a swinging disk.

As you will notice from their designs, these check valves are wafer-shaped. They let flow in one direction while automatically blocking flow in the other.

It does not require bolts or nuts since it fits between two flanges.

Wafer Swing Check Valve
Wafer Swing Check Valve

Advantages of Wafer Swing Check Valve

  • Space-Efficient – Compact in size and requiring little room for support, the valve design allows for installation in the gap between flanges.
  • Lightweight Design – The wafer swing check valves’ light weight makes them simple to handle during installation and upkeep tasks.
  • Simple to Set Up – Wafer swing check valves are simple in their construction and arrangement.
  • Versatility – These valves are adaptable and work well in various settings and applications. They are available with features including cushions, weights, levers, vertical servicing, oxygen cleaning, silicone-free cleaning, and left-hand operation.
  • Economical – The wafer swing check valves are straightforward to manufacture.
  • Low-Pressure Drop – Wafer swing check valves reduce pressure while in the open position, which helps maximize fluid flow efficiency by reducing the effect on the system’s total pressure.
  • Fast Closing Action – The wafer swing check valve’s swing disc provides quick closing action to stop the reverse flow and water hammer effects, shielding the system from harm.
  • Durability – Cast iron, stainless steel, and ductile iron make these valves provide long-term stability against corrosion.
  • Decreased Maintenance Needs – Since seated O-rings are widely accessible in various sizes and designs, replacing a wafer swing check valve is simple.
  • Spring-Assisted Option – Certain wafer swing check valves have a spring-assisted mechanism to remove media that contains caustic or fibrous materials from the flow channel to increase the closing speed.

Main Features Valves with Swinging Disc

· Compact Design

They are inexpensive, simple to install, and appropriate for areas where space is an issue due to their lightweight and compact design.

· Configuration of Wafers

There is no need for extra gaskets because the wafer design makes it easy to fit between the flanges.  It makes replacement and upkeep easier.

· Low-Pressure Shut-Off

Wafer swing check valves reduce the effect on the system pressure by having a low-pressure drop across the valve in the open position. These avoid reverse flow or water hammer effects, which might harm the system if it completely closes the valve.

Wafer Swing Check Valve Specifications
Wafer Swing Check Valve Specifications

Parts and Function


The body is the primary external shell that protects the other parts. You can easily install these valves between pipe flanges. You will find the valves in narrow and positioned between two flanges.


The disc is a moving part that pivots or hinges inside the valve. Besides, the disc is in charge of permitting or preventing fluid passage via the valve.

Hinge/Pivot Pin

The disc swings around the hinge, also known as the pivot pin. Also, it gives the disc unrestricted motion, allowing it to swing either way in reaction to variations in fluid flow.


Help close the valve rapidly and stop any reverse flow or water hammer effects. The spring ensures the disc quickly returns to its closed position by exerting extra force.


When the disc is closed, it comes into contact with this sealing surface. Usually, it guarantees a tight seal, reducing leakage and stopping backflow.

Body Flanges

These sections of the valve join to the plumbing system. They offer a way to fasten the valve in the space between two pipe flanges.

Bolts and Nuts

To guarantee correct operation and stop leaks, bolts, and nuts tighten the valve’s connection between the flanges.

Body Gasket

It provides a safe, leak-tight seal between the pipe flanges and the valve body.

Parts of Wafer Swing Check Valve
Parts of Wafer Swing Check Valve

Working Principle of Wafer Swing Check Valve

Although there are many check valves with swinging discs, you will find that the working principle is nearly the same. Among the key working elements of these valves are:

Normal Flow

The fluid’s pressure opens the valve when it flows forward thereby causing the swing disc hanging at the top of the valve body to swing away from the flow path. As a result, it lets the fluid pass through freely.

Pivoting Disc

The disc is attached to a hinge or pivot pin, which allows it to swing in response to variations in the fluid flow.

Unobstructed Flow

As the fluid passes through the valve in a forward direction, the swinging disc moves away from the valve seat. As a result, it creates an unobstructed pathway for the fluid. At the same time, it minimizes resistance and pressure drop when the valve is in the open position.

Backflow Prevention

One purpose of the swing check valve is to stop backflow. The swing disc swings back toward the valve seat in the event of an attempt at reverse flow with the help of a spring or gravity.

Closure Mechanism

The swing disc returns to its closed position, obstructing the flow route, while the fluid tries to flow in the other direction. Therefore, you will realize the valve closes due to the disc’s weight and fluid pressure.


The swing disc creates a seal with the valve seat when it is in the closed position. The valve seat, a sealing surface inside the body, guarantees a tight closure and stops fluid leaks.

Quick Closing Action

By stopping fluid flow abruptly, this feature avoids water hammer effects, which can cause a shockwave that can harm pipes and other components.

Clearly, you will realize that the working principle of wafer swing check valves involves a series of activities. Each part of the section, performs specific functions in any fluid flow system.

Wafer Swing Check Valve Working Principle
Wafer Swing Check Valve Working Principle


Water Supply Systems

Wafer swing check valves guard against pollution by preventing water from flowing the wrong way and assisting in maintaining the intended path.

Industrial Processes

Use in manufacturing facilities, petrochemical plants, and chemical processing operations to restrict fluid movement in the opposite direction and preserve process integrity.

Sewage Treatment Plants

Ensures the sewage flows in the desired direction to prevent backflow.

HVAC (heating, ventilation, and air conditioning) systems

They regulate the flow of refrigerants or water by stopping unintentional backflow in the plumbing system.

Fire Protection Systems

Water flows in the proper direction when needed to control fires thanks to wafer swing check valves in fire prevention systems.

Pulp and Paper Industry

It regulates liquid flow in several operations, avoiding reverse flow, which might impede output.

Power Plants

Applied in applications where directing fluid flow is crucial, such as cooling systems and water circulation systems.

Chemical Processing Plants

They regulate the flow of different chemicals and stop backflow to guarantee process efficiency and safety.

Food and Beverage Sector

Wafer swing check valves provide product quality in procedures where regulating liquid flow is crucial to avoiding contamination.

Oil and Gas Sector

It helps to keep the fluid flow in pipes moving in a predetermined direction and eliminates backflow.


In various applications, wafer swing check valves provide dependable backflow protection.

Their lightweight construction, simplicity of installation, and rapid closure render them indispensable for effective fluid system control.

More Resources:

Check Valve – Source: KINVALVE

Types of Valves – Source: THOMASNET

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