Check valves are important to many different processes and applications, including gas and fluid systems. But how does a check valve work? In this article, we will be discussing the check valves working principle, as well as check valve types and applications.
The check valve working principle is based on allowing flow in one direction and automatically preventing flow in the reverse direction. Check valves are one of the only valves that are completely self-automated and do not require human interaction to manually cycle them.
The construction of a check valve is normally quite simple including components such as a body, seat, disc and cover. These valves are flow sensitive and depend on media to open and close the seat. The internal disk allows media to flow forwards, which forces the valve to open. The flow is then reversed, closing the valve.
There are six different check valve types, all of which can be used in an array of applications and processes. These include:
• Swing check valves
• Dual disc check valves
• Silent check valves
• Nozzle check valves
• Ball check vales
• Tilted check valves
When discussing check valve applications, we must first consider the media being processed. In relation to gaseous processes, check valves are often used when multiple gases are mixed into one gas stream. A check valve is installed on each of the individual gas streams to prevent mixing of the gases in the original source.
Check valves are also used in many fluid systems, such as those in chemical and power plants. Typical applications in the nuclear industry include feed water control systems; dump lines; make-up water; miscellaneous process systems; N2 systems; and monitoring and sampling systems. In aircraft and aerospace, check valves are used where high vibration, large temperature extremes and corrosive fluids are present.
At Fluid Controls, we are proud distributors of Parker check valves. Designed for uni-directional flow control of fluids and gases, Parker check valves are a cut above the rest, offering many check valve types. Mainly used in industries such as chemical processing, oil and gas production and transmission, Parker check valves are perfect for any application.
Veriflo Division’s F9 Series Check Valve is an all welded high purity check valve, featuring a patented asymmetric spring design for a consistently quiet operation. The F9 Series Check Valve offers high Cv (up to Cv = 0.90) in a small footprint to conserve much-needed panel space.
These high-performance check valves offer two options for cold working pressure ratings of Class 2500 and Class 4500, with an opening pressure of 10 psi max. By offering a true two-piece design, body leakage paths are kept to a minimum.
Parker’s CO Series of uni-directional flow control valves are suitable for the control of fluids and gases in industries such as chemical processing, oil and gas production and transmission, pharmaceutical, pulp and paper, power and utilities. The CO Series Check Valve is particularly suitable for applications requiring high integrity leak rates and re-sealing capabilities.
Speak to a Fluid Controls expert today about check valve types and applications by calling 0118 970 2060. For more information, on how a check valve works send us an email at email@example.com our technicians will be happy to help.