Gate, globe, and check valves should be inspected periodically for leaks and proper operation. If a leak is found or the valve operates improperly, the problem is located. A repair is made to restore the valve to a serviceable operating condition. See figures 11, 12 and 13.
Figure 11. Croll Section of Gate Valve
GATE VALVE MALFUNCTIONS AND REPAIRS
NOTE: If the valve cannot be repaired, replace it.
Figure 12. Cross Section of Globe Valve
GLOBE VALVE MALFUNCTIONS AND REPAIRS
NOTE: If valve cannot be repaired, replace it.
Figure 13. Cross Section of Swing Check Valve
SWING CHECK VALVE MALFUNCTIONS AND REPAIRS
|David L. Heiserman, Editor||
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Revised: June 06, 2015