Self-acting valve
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Dear experts, does a self-acting valve actually regulate the pressure before or after the control valve? In regards to the two diagrams above, my understanding is that the side from which the dashed line originates is the side whose pressure is being regulated. Is this understanding correct?
It can be placed before or after the valve depending on process requirements.
Yes, that triangular face faces that way, and that is the pressure after pressure reduction.
Yes, the pressure before and after the control valve is acceptable; it’s just a difference in the way the spring force and the pressure tapping tube exert their effects.
Yes, the pressure before and after the control valve is acceptable; it’s just a difference in the way the spring force and the pressure tapping tube exert their effects.
Shouldn’t the direction of the triangle be determined by which side is used for voltage regulation? The level of pressure isn’t necessarily fixed, right?
The understanding should be correct; the pressure set value mentioned above also indicates the control pressure value
This depends on the requirements of your process flow. As can be seen from the arrows in the flow diagram above, this is a pressure relief valve that controls the pressure before the valve.
The stand-alone control valve can be used to adjust pressure either before or after the valve; as you can imagine, the pressure at the area indicated by the dashed line is the one that is adjusted.