Swing Check Valve vs. Wafer Check Valve

Attribute	Swing Check Valve	Wafer Check Valve
Valve Type	Check Valve	Check Valve
Design	Swing Disc	Wafer Type
Installation	Vertical or Horizontal	Horizontal
Size Range	1/2" - 24"	2" - 48"
Pressure Rating	150 - 2500 psi	150 - 600 psi

Check valves are essential components in piping systems to prevent backflow and ensure the flow of fluids in one direction. Two common types of check valves are swing check valves and wafer check valves. While both serve the same purpose, they have distinct attributes that make them suitable for different applications. In this article, we will compare the attributes of swing check valves and wafer check valves to help you understand their differences and choose the right valve for your specific needs.

Design

Swing check valves have a hinged disc that swings open to allow flow in one direction and closes to prevent backflow. This design is simple and effective, making swing check valves suitable for applications where minimal pressure drop is desired. On the other hand, wafer check valves have a disc that moves back and forth between the valve seats to control the flow of fluids. This design is compact and lightweight, making wafer check valves ideal for tight spaces and applications where space is limited.

Installation

Swing check valves are typically installed between flanges using bolts and nuts to secure the valve in place. This installation method provides a secure connection and allows for easy maintenance and replacement of the valve. In contrast, wafer check valves are installed between flanges without the need for bolts and nuts. Instead, the valve is held in place by the flanges, making installation quick and easy. However, this design may not be as secure as the bolted connection of swing check valves.

Pressure Rating

Swing check valves are available in a wide range of pressure ratings, making them suitable for high-pressure applications. The hinged disc design of swing check valves can withstand high pressures without compromising performance. On the other hand, wafer check valves are typically designed for lower pressure applications. While some wafer check valves can handle moderate pressures, they may not be suitable for high-pressure systems.

Flow Capacity

Swing check valves have a larger flow capacity compared to wafer check valves. The hinged disc design of swing check valves allows for a more unrestricted flow of fluids, making them ideal for applications where high flow rates are required. Wafer check valves, on the other hand, have a smaller flow capacity due to their compact design. While wafer check valves can still handle moderate flow rates, they may not be suitable for applications with high flow requirements.

Material Selection

Both swing check valves and wafer check valves are available in a variety of materials, including stainless steel, cast iron, and PVC. The choice of material depends on the specific requirements of the application, such as the type of fluid being handled and the operating conditions. Stainless steel valves are commonly used for corrosive environments, while cast iron valves are suitable for high-temperature applications. PVC valves are ideal for applications where chemical resistance is required.

Cost

Swing check valves are generally more expensive than wafer check valves due to their robust design and higher pressure ratings. The hinged disc mechanism of swing check valves requires precision engineering, which adds to the cost of manufacturing. On the other hand, wafer check valves are more cost-effective due to their simple design and lower pressure ratings. While both types of valves are durable and reliable, the cost difference may be a factor to consider when choosing between swing check valves and wafer check valves.