Excess Flow Valve

Excess Flow Valve

Excess Flow Valve

Excess Flow Valve / Pipe-break Valve

PN 325
DN 6 - 120
NPS 1/8" - 6"
Class 150# - 1500#
Temperature Rating -196°C up to +800°C
Body forms

Angle pattern body

Basic Shell materials

Carbon steel, Stainless steel, Hastelloy, Inconel, Pure nickel, Titanium, Other special alloys


Flanged ends, butt welding ends
Socket welding ends, threaded ends

Operation & Options

Threaded flanges and other requirements


Excess Flow valves are known by other names such as pipe-break valve, velocity check-valve or The valve seat is held open by a spring. When the flow of the fluid exceeds a certain preset limit the valve seat, or disc in this case, closes and shuts off flow. In normal operations of loading and unloading, the in-line flow is restricted by the pressure drop through the hose and or pipeline. In the event of a rupture, disconnection, or line break, the pressure will drop, the flow will surge exceeding the spring load limit, and the valve will close.

Main installed base of our excess flow valves is in bullet storage tanks.


Leakrate A

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