Selection Guide

F-26752-12 Copyright 2008 TAC All Rights Reserved. 15
Cavitation Limitations on Valve Pressure Drop
A valve selected with too high a pressure drop can cause erosion of discs and/or wire drawing of the seat. In addition, cavitation
can cause noise, damage to the valve trim (and possibly the body), and choke the flow through the valve.
Do not exceed the maximum differential pressure (pressure drop) for the valve selected. Refer to the chart in Figure-7.
Additional Valve Sizing Information
For additional valve sizing information, refer to the “Applicable Literature” section for a list of documents pertaining to valve sizing.
70
65
60
55
50
45
40
35
30
25
20
15
10
5
0
0 102030405060708090100110120
130
Maximum ΔP of Valve (psi)
Inlet Pressure to Valve (psi)
50 °F Water
140 °F Water
160 °F Water
180 °F Water
200 °F Water
220 °F Water
Cavitation Zone
1
1 Maximum allowable ΔP for a valve with 45 psi
and 50 °F water is 30 psi, based on cavitation.
Figure-7 Maximum Allowable Differential Pressure (DP) for Water Valves.