Valve Proving With Two Pressure Switches; Introduction - Siemens LMV5 Series Technical Instructions

LMV Series Technical Instructions
Document No. LV5-8000

Valve Proving with Two Pressure Switches

Introduction

Valve proving detects if 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.
SCC Inc. Page 35 Appendix A
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