How do I Check a Water Valve With Low Cracking Pressure?

Checking a water valve with low cracking pressure requires the installation of a pressure gauge on the water pipe, up line from the valve. Cracking pressure is the pressure required to open the check of a water valve. A check prevents the backflow of water up the line, while allowing water to move down the line. Check valves function mechanically without your assistance, and all of the parts of a water check valve are internal, so the valve cannot be adjusted. This is why it is important to check the cracking pressure of your water valve.Hydraulic Valves , Hydraulic Pressure Control Valves Instructions Turn off the water up line from the water check valve you are checking. If there is not a shutoff valve up line from the valve you are checking, you will have to shut off the main line. 2 Disassemble the pipe from the valve with your wrenches. You only need to disassemble the up line side; leave the down line pipe attached to the valve. 3 Install the pressure gauge between the water check valve and the pipe. The pipe should be attached to the pressure gauge and the pressure gauge should be attached to both the pipe and the water valve. 4 Slowly release water back into the line as you watch the pressure gauge. The pressure on the gauge should steadily build and then drop for a split second. That drop in pressure indicates the cracking pressure of the valve.

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