Disassembly of membrane control valve
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Has anyone ever disassembled the actuator of a diaphragm control valve? I suspect the diaphragm is damaged and I want to take it apart; does anyone have any experience with disassembly?
There are springs inside the demon head; be careful when disassembling it – leave two long bolts in place to loosen it slowly.
The diaphragm head can be opened by unscrewing the screws around it, and the diaphragm itself can be removed by unscrewing the nut that holds it in place. When disassembling, be careful of the pre-tension of the internal springs to avoid injury. Generally, there are 2 longer screws used to secure the membrane head; when removing these screws, do not unscrew the nuts of these longer screws – wait until the spring has released its tension before removing them.
Just one thing: the two longest screws are removed last, and they are also the first to be installed when assembling……
Doubt? ~~The diaphragm is broken; either the valve must be fully open (air-shut) or fully closed (air-open)~~
I’ve learned from it; thank you all for the lively discussions