Valve-Ex Flo Mpol X 1/4 Mpt 1.5 Gpm Br

Excess flow check valves close when the flow rate of vapor or liquid exceeds the valve’s rated flow capacity. They are used to protect cylinder, tank, and piping systems. The valves are available in a variety of sizes and body configurations. When flow exceeds the valve’s setting, the valve closes and remains closed until the system equalizes. A built-in equalizing passage automatically opens the valve once pressures on both sides of the poppet are equal. A rule of thumb for sizing excess flow valves is to choose a valve with a closing flow 1.5 times the maximum operating flow. For surge conditions, 2 times maximum flow may be required. However, the excess flow valve’s closing flow rate must be less than the capacity of the LP-Gas or NH3 system in which the valve is being used. The flow rating of the piping, fittings, pump, valves, and hose on both the inlet and outlet of the excess flow valve must be greater than the flow rating of the excess flow valve. If branching, piping length, additional valves, reduction in pipe size, elbows, or other necessary components in the piping system create restrictions which reduce the flow rating to less than that of the excess flow valve rating, the valve will not give excess flow protection, and additional excess flow valves must be installed at these points. Excess flow valves are non-repairable. Replace non-functioning valves.