LGF-PA66 Flow Meter: Water Hammer Resistance in Pump Cycling Sites

Water hammer comes from sudden pump starts/stops or fast valve closure, with transient pressure peaks reaching several times the normal working pressure. It is the most common risk in valve pits and pump-house metering points. The LGF-PA66 body is injection-molded from aviation-grade PA66 composite and rated PN16. PA66 is a tough material - unlike cast iron bodies it carries no brittle-cracking risk under transient shock; combined with a PTFE liner and 316L electrodes, it steadily withstands the pressure fluctuations of normal municipal pump cycling.

For frequent pump-cycling sites we still recommend three measures:

• Install a water hammer eliminator or slow-closing check valve downstream of the pump to cut pressure peaks at the source;
• Do not mount the LGF-PA66 right at the pump outlet - keep at least 5D distance and respect the straight-run requirement of 5D upstream / 3D downstream;
• For severe fluctuations choose the PN25 flange rating or contact our technical team for a custom configuration.

The PA66 body is about 40% lighter than stainless steel (DN100 reference), so inertial loads on flange joints during water hammer are lower; with bolts tightened to standard torque, long-term sealing stays reliable.

For more details, please visit our product pages or contact our technical team.