Check valves prevent flow reversal in a line. When open and under pressure, the checking mechanism moves freely in the media, offering little resistance and minimal pressure drop.
Common types are swing check valves and ball check valves.
A swing check valve utilizes a swinging disc, which requires only minimal back pressure to close the valve. This valve can also be modified, with a lever and weight or spring, to assist in seating faster to eliminate shock.
A ball check valve employs a free-moving ball, which unseats to permit flow in one direction, but seals against a seat to prevent backflow.
Title: How does a check valve work?
Description: Explanation of how a check valve works.
Published: 6/4/2008
Last Edited: 1/20/2023
Information disclaimer:
The information contained in this article is for general information purposes only. The information is provided by
United States Plastic Corp. and while we endeavor to keep the information up to date and correct, we make no representations or
warranties of any kind, express or implied, about the completeness, accuracy, reliability, suitability or availability with
respect to the website or the information, products, services, or related graphics contained on the website for any purpose.
Any reliance you place on such information is therefore strictly at your own risk.
In no event will we be liable for any loss or damage including without limitation, indirect or consequential loss
or damage, or any loss or damage whatsoever arising from loss of materials, time or profits arising out of,
or in connection with, the use of this information.