introduce
This is the most complete guide on the internet
You will learn:

What is a spring check valve
What is a swing check valve
How spring check valves work compared to swing check valves
Types of Spring Check Valves
Types of Swing Check Valves
How Spring Check Valves and Swing Check Valves Connect to Pipelines
and more…
Spring and Swing Check Valves
Chapter 1 – What is a Spring Check Valve?
A spring check valve is a valve that ensures one-way flow and prevents reverse flow. They have an inlet and outlet and must be placed in the correct orientation to function properly. On the side of spring check valves and all check valves, there is an arrow pointing in the direction of flow. A spring-loaded check valve is called a one-way valve or one-way valve. The purpose of a spring check valve is to use a spring and pressure applied to the disc to stop backflow to close the valve.

spring check valve
Check-All Valve Mfg. Co’s Spring Check Valve

In order for a check valve to work properly, it must have a differential pressure, flow from high pressure to low pressure. High pressure or cracking pressure on the inlet side allows fluid to flow through the valve and overcome the strength of the spring in the valve.

In general, a check valve is a device that allows any form of media to flow in one direction. The shape of the check mechanism can be spherical, disc, piston or poppet, mushroom head. Spring check valves prevent reverse flow as a way to protect pumps, equipment and machinery when pressure in the system begins to decrease, slow, stop or reverse.

Chapter 2 – What is a swing check valve?
Swing check valves allow one-way flow and close automatically when cracking pressure decreases. They are a form of butterfly valve with a disc covering the valve opening. The puck is attached to a hinge so that when it is struck by the flow of media, the puck can swing open or closed. An arrow on the side of the valve body indicates the direction of fluid flow in and out of the valve.

The pressure level of the fluid pushes the disc or door open, allowing the fluid to pass through. When the flow moves in the wrong direction, the disc closes due to the thrust of the liquid or medium.

Swing check valve

Swing check valves do not require external power. The passage of fluids or media through them is not hindered by their presence. They are installed horizontally in pipes, but can be installed vertically as long as the flow is upwards.

Leading Spring Check Valve Manufacturer and Supplier
Check-All Valve Manufacturing Company – Logo
Check-All Valve Manufacturing Company
ASC Engineering Solutions – Logo
ASC Engineering Solutions
○
O’Keefe Controls
CPV Manufacturing, Inc. – Logo
CPV Manufacturing Company
contact these companies
Get your company listed above

Chapter 3 – Types of Spring Check Valves
For a spring-loaded check valve to work properly, it must have upstream pressure, called cracking pressure, to keep it open. The amount of cracking pressure required depends on the valve type, its construction, spring characteristics and its orientation in the pipeline. Specifications for cracking pressure are in pounds per square inch (PSIG), pounds per square inch (PSI), or bar, and the metric unit of pressure equals 14.5 psi.

When the upstream pressure is lower than the cracking pressure, back pressure becomes a factor and fluid will try to flow from the outlet on the valve to the inlet. When this happens, the valve closes automatically and flow stops.

Spring Check Valve Type
Axial flow silent check valve
With an axial flow silent check valve, the valve plate is held in place by a spring that centers the valve plate for smoother flow and immediate opening and closing. The spring and disc are in the center of the pipe, and the fluid flows around the disc. This is different from swing valves or other types of spring valves, which pull the disc completely out of the fluid, leaving a fully open tube.

The special design of the axial flow silent check valve makes it more expensive than traditional spring check valves and swing check valves. While they are more expensive, the return on investment is due to their long lifespan, which can take over three years to replace.

The unique construction of the Axial Flow Quiet Check Valve allows you to see below where the valve opens and fluid flows. Like spring check valves, axial check valves begin to close when upstream pressure drops. As the pressure slowly decreases, the valve slowly closes.

Axial static flow check valve

Ball spring check valve
Ball spring check valves use a ball as a sealing seat near the inlet hole. The seal seat is tapered to guide the ball into it and form a positive seal. When the cracking pressure from the flow is greater than the spring holding the ball, the ball is moved,