Ushookup info

6854933580_2c8b688306_z

The water travels through this sensing line to the elastic element in the relief valve.

The elastic element is either a diaphragm, or a rolling diaphragm.

Ushookup info-33Ushookup info-32

The pressure after the 2nd check will be reduced by the amount of pressure it takes to open the 2nd check.Because of this flow of water, the pressure upstream of the RP is now great enough to cause the check valve to open and flow water to the fixture demanding water.Check valves only open enough to fill the demand for water; they do not open fully, but usually modulate to fill the demand for water.The higher inlet pressure (100 PSI) is placed on the high pressure side of the elastic element in the relief valve, and the lower pressure past the 1st check (90 PSI) is placed against the low pressure side of the elastic element.2nd Check Valve Once this area between the two checks and the low pressure side of the relief valve is pressurized, the pressure will now cause the 2nd check to open.This pressure will build up on the high pressure side of the elastic element, which will deflect and cause the relief valve stem to compress the relief valve spring, and move the relief valve disc to seal against the relief valve seat.

You must have an account to comment. Please register or login here!