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Check Valves
Check Valves
Check valves are also called one way valves. The valve only allows the gas to flow one way. It is important when you buy check valves to have the correct male or female input and output as there is no turning them around. The flow direction is marked on the check valve with an arrow. Check valves are used in mixing whips to prevent gas from flowing back into the main storage tank. A check valve is also used on compressor and mixing panels for the same basic things.
Johns Tip’s: Brass versus Stainless
The choice is yours here. Either one will work on mixing whips. The real problem comes into play if the panel will also see high pressure air above 3,000psi.
Brass 3,000psi working pressure
Stainless 5,000psi working pressure
Johns Tip’s: Teflon Taping Parts
Teflon tape is not for sealing, yeah I said it what you gone to do about it! Follow my train of thought here Teflon tape is guess what Teflon. The Teflon tape is used to make the parts go together smooth. They actually seal by the metal parts coming in tight contact with each other. Teflon tape needs to be wrapped the same direction that the part is being screwed in. You only need one and half to two wraps no more. If the part does not seal with that amount check the threads for foreign material.
Stainless Steel Additional Tips
If you are putting together two stainless steel parts you have to be sure to watch for galling. Stainless steel heats up quick when you put it together and the parts will lock up before the seal is complete. If it is a bad case you might not even be able to get the two parts apart. To avoid having this happen, run a tap “lightly” in the female side of the fitting. Then Teflon tape, after you Teflon tape it run a light bead of christo lube on the starting couple of threads. Then slowly tighten the parts.