Can a self-acting valve in a heating furnace’s gas pipeline be purged with steam?
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Can a self-acting valve in a heating furnace’s gas pipeline be purged with steam? If it has already been purged with steam, is low backpressure the reason?
Allowing the pressure tap to come into contact with steam (condensate) may cause some problems, especially in winter.
I agree with Lao’s view; self-acting control valves are significantly affected by the pressure guiding pipes
I’m not sure what the structure of this self-acting valve used by the original poster is like. The self-acting valve on our gas line doesn’t have a pressure guide tube; its internal structure consists of a spring and a diaphragm. If the pressure is low, it might be because the valve on the back side is open too much – reducing its opening slightly will help build up pressure. The pressure in the gas tank is actually high enough; just adjust the self-acting valve accordingly
It’s best not to use steam for purging, as steam carrying liquid might freeze something somewhere. After passing through the pressure regulator, the pressure naturally drops to the value set by it; if possible, disconnecting and making a short circuit will make things simpler and less troublesome