Here are some steps to test the gate valve on a foam bladder tank:
Ensure the tank is empty and the bladder is deflated before testing the valve.
Locate the china gate valve on the tank. It will be a valve body with a lever or handle to open and close the valve.
Ensure the valve is in the closed position (handle down) to start the test.
Pressurize the tank bladder using an air compressor to a pressure of around 2-5 psi.
Check for any air leaks around the valve seal or stem. If leaks are found, the valve may need repair or replacement.
Carefully open the gate valve by raising the handle or lever.
Ensure air flows through the valve smoothly without obstruction. Some resistance is normal, but the valve should not get stuck open or closed.
Check that the air pressure in the tank reduces at a controlled rate when the valve is open.
The air should not rush out rapidly or escape silently. Some air flow audible.
Close the gate valve to shut off air flow.
Ensure it seals properly and air pressure in the tank holds. No leaks should be detected.
Repeat the opening and closing of the valve a few times to further test its functionality and ensure there are no binding, sticking or sealing issues.
Deflate and depressurize the tank bladder completely when done testing the gate valve. Leave the valve in the closed position for future use.
Test the valve again, if any problems were found during the initial test. Sometimes valve seats can seating may require some cycling to become fully seated for a proper seal.
