electric gas shut/off valve

Rogershaw said:
I would think is a spring closed poppet valve that will only stop any flow in one way. The inlet pressure keeps the vlave closed and the solonoid opens the valve against the inlet pressure and spring.
Click to expand...
Yep, that's right. If there is no pressure in the input side it's only the weak little spring which is keeping the valve closed. If there is equal pressure on both sides, then the spring is plenty strong enough. :)

Richard
 
RichardS said:
It's a very old thread ..... but here's an interesting conundrum that might amuse our most technically astute forumites. :)

I have my gas solenoid valve and all my boat gas system here at home whilst I replace some of the flexible gas pipe. Having fitted the new pipe, I decided to test the assembly using my compressor. I put 100 psi into the end which connects to the butane cylinder on the boat with the solenoid valve disconnected from a battery and left it for a few days. After a few days the pressure was still 100 psi. Result.

I then connected the compressor to the end of the pipe with connects to the cooker in the galley so that's through 10m of 10mm hose and hence a large volume of gas. As soon as the pressure rose above a couple of psi, the solenoid valve opened (still no electric connected) and the entire contents of the hose were released into the "boat" through a vent in the bottom of the gas regulator which is connected directly to the cylinder-side of the solenoid valve.

Jeez, I thought, no wonder we can smell gas on the boat! So I decided to dismantle the solenoid valve to find out why it was failing so miserably.

It took me a few minutes but then the penny dropped. ;)

What do you think?

Richard
Click to expand...

I think you've got too much time on your hands. :) :) :) :) :)
 
RichardS said:
Yep, that's right. If there is no pressure in the input side it's only the weak little spring which is keeping the valve closed. If there is equal pressure on both sides, then the spring is plenty strong enough. :)

Richard
Click to expand...

Thanks

I spent several years designing pneumatic and hydraulic systems for tube making and manipulating machines.

I also have hydraulic operated stern hatch on my boat.
 
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