Water hammer can damage or burst pipes, valves, storage tanks and filter housings.  Hammer occurs when water moving at high velocity is suddenly stopped (e.g. washing machine and dishwasher solenoids, lever taps).  Unlike air, water is not compressible so the energy stored in the column of water cannot simply be dissipated by momentarily “squashing” up.

The pressure surge travels back and forth along the pipes trying to disperse the energy where it can and this is where the damage is sustained if there is no “give” in the system. 

While lowering the water pressure (ALL filters are rated for a max of 125psi) will lower the velocity of the water and thus reduce water hammer effects, the damaging energy surge can still occur at quite low pressures.

Dual Check, Anti-Hammer Limiting Valves

Many of the in-line static pressure limiting valves (not to be confused with the Waterline PRV) available for water filter systems, also incorporate dual check valves.  When the pressure surge from a sudden stoppage of water flow travels back to the limiting valve, the check valves halt the movement and all the energy has to be dissipated within the short distance from tap to valve; this is where damage can be sustained to filter housings.

The reference to “Anti-Hammer” means that the pressure surge does not travel any further back from the limiting valve and therefore there is no water hammer throughout the rest of the house.

 Waterline PRV

 The Waterline PRV has an expansion chamber and no check valve/s and therefore substantially reduces potential water hammer damage to filters by:

v           expanding the upper chamber of the PRV (the rubber diaphragm has air on the other side of it) thus dissipating much of the energy surge.

v           allowing the pressure surge to travel right through and dissipate any remaining energy throughout the whole house.

      Comes with 1/4" push lock fittings, ready to instal, no tools required.