By installing the spool piece upstream of the Wafer Check, an additional 3 pipe diameters can be gained. This will substantially reduce wear, decrease water hammer, and virtually eliminate seat scrubbing. Another cause of chattering is inappropriate flow rate. High liquid flow velocities can increase the frequency of the currents and vortices, leading to a reduced valve life as well as increased pressure drop across the valve. An insufficient flow rate can also cause disc chattering.
Minimum flows vary depending on the type of check valve, as shown.
For optimum performance, we recommend certain minimum and maximum velocities for liquid and gas installations. Gulf Valve Corp. All Rights Reserved.