LMV Series Technical Instructions
Document No. LV5-80
00
SCC Inc. Page 35 Appendix A
Valve Proving with Two Pressure Switches
Introduction
Valve proving detects i
f the main gas valves in a gas train are leaking. Typically, one pressure
switch, mounted between the main gas valves, is used to test for valve leaks. However, a more
sensitive test can be performed using two pressure switches, one switch to test the upstream
valve, and one switch to test the downstream valve. To perform valve proving with two
pressure switches, both switches must be mounted between the main gas valves as shown
below.
Wire the LMV5, pressure switches, main valve POC switches, and a relay as shown below.
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