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Repair The Handles On Cryogenic Knife Gate Valve 2012-03-05

Gate valves are so named because they close off the flow of water through a pipe just as gates in fences prevent passage from one side to the other. Gate valves have a wedge-shaped internal plunger that is raised and lowered into a housing, properly called a “valve bonnet,” by the twisting of a stem. This design ensures that, when fully open, the valves have the same bore as the pipe they interrupt; they do not constrict flow at all. Gate valves typically have a round handle at the end of the stem that looks like a small boat helm; these handles are often painted red.

1 Turn the water supply off for the home at the main supply valve.

2 Locate the Cryogenic Gate Valve that has the bad or broken handle.

3 Turn the valve all the way to the left.

4 Place an adjustable wrench over the nut on the valve.

5 Hold the valve with your hand and turn the wrench to the left to loosen the nut.

6 Unscrew the nut by hand until it comes off and then take off the handle.

7 Place the new handle on the valve and replace the nut.

8 Tighten the nut by hand and then use the adjustable wrench to make sure the nut is tight to properly secure the handle.

9 Turn the water back on at the main supply valve.

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