Propane Pigtails Leaking
Perhaps someone can explain how these work or do not work. When I got my RV a few years ago, I had to replace the propane pigtails. One leaked at the connection to the tank. Now I have the same iss...
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ACME Nut components
Nipple:
Stub with metered hole. It pushes the spring-loaded shut-off valve inside cylinder service valve OPEN. Hose has to be attached to cylinder for propane to flow
Thermal Bushing:
Melts when exposed to temps over 240*F. Causes 'nipple' to slide and Closes spring-loaded shut-off valve inside propane cylinder service valve
2 Styles.........
Old version------thermal bushing exposed at backside of nut
NEW version------thermal bushing not exposed but identified by slits in nut
Excess Flow Check Valve:
Spring loaded 'steel ball' that moves against spring when cylinder service valve is opened (partially restricting propane flow). When downstream line pressure 'equalizes' the spring moves ball back allowing full propane flow. THIS is the 'check valve' that can trip closed when propane cylinder service valve is opened to quickly.
Nipple:
Stub with metered hole. It pushes the spring-loaded shut-off valve inside cylinder service valve OPEN. Hose has to be attached to cylinder for propane to flow
Thermal Bushing:
Melts when exposed to temps over 240*F. Causes 'nipple' to slide and Closes spring-loaded shut-off valve inside propane cylinder service valve
2 Styles.........
Old version------thermal bushing exposed at backside of nut
NEW version------thermal bushing not exposed but identified by slits in nut
Excess Flow Check Valve:
Spring loaded 'steel ball' that moves against spring when cylinder service valve is opened (partially restricting propane flow). When downstream line pressure 'equalizes' the spring moves ball back allowing full propane flow. THIS is the 'check valve' that can trip closed when propane cylinder service valve is opened to quickly.
