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Pressure Seal Check Valve Checking Test 2011-11-21

The Pressure Seal Check Valve design incorporates a metal-to-metal seal that becomes tighter as the pressure increases. The initial preload deforms the taper on the soft iron gasket to mate with the taper on the bonnet. The thin knife-edge on the gasket is wedged tightly between the body and the bonnet. The shallow angle insures that the gasket is sealed tightly with only a small upward force on the bonnet. Once the initial seal is created, the body/bonnet joint will remain leak free regardless of thermal or pressure conditions in the valve.After the joint has been assembled, there is no further need to adjust bonnet cap screws.

A Pressure Seal Check Valve that is installed on the water line in your home is designed to allow water to enter and leave the valve. These valves are typically automatic and do not require external controls or user input to operate. Pressure Seal Check Valves can be a single or double valve unit. You must test a Pressure Seal Check Valve to verify that the correct water pressure is coming into your home.

1 Open the high-side and low-side bypass valves. Turn the valves to the left or counterclockwise to open the valves.

2 Attach the high-side hose on the Pressure Seal Check Valve test kit to the fitting, on the testcock, which is on the left side of the Pressure Seal Check Valve.

3 Attach the low-side hose on the Pressure Seal Check Valve test kit to the fitting, on the testcock, which is on the right side of the Pressure Seal Check Valve.

4 Turn the #1 shut-off valve to the right or clockwise to close the valve. The #1 shut-off valve is the one that is connected to the water line in the house.

5 Open the testcocks that have the hoses attached. This needs to be done slowly.

6 Close the high-side bleed valve that is behind the left side of the Pressure Seal Check Valve test kit. Close the low-side bleed valve that is behind the right side of the Pressure Seal Check Valve kit.

7 Read the PSI pressure on the display of the Pressure Seal Check Valve test kit.

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