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MSS SP-133-2005 Excess Flow Valves for Low Pressure Fuel Gas Appliances
standard by Manufacturers Standardization Society, 01/01/2005
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Full Description
The purpose of this document is to provide a standard practice for excess flow valves installed in low pressure fuel gas piping systems which are designed to protect the appliance and its connections to the piping system by reducing the flow of gas should the flow in the line exceed some predetermined level.