How to set the wiring of the self-operated regulating valve?
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Can it be set up as below? How to set it correctly? Process pipeline——Gate valve——Self-operated pressure regulating valve——Gate valve————Process pipeline | | ————Stop valve————The stop valve is placed between the upstream and downstream gates. Is this design reasonable?
unreasonable. The tees on both sides connecting the stop valve should be set outside the gate valve before and after the regulating valve, that is, the gate valve can be closed to cut off the gas used by the regulating valve, and the stop valve can be used to regulate pressure. In addition, a safety shut-off valve should be installed in front of the regulating valve to prevent downstream overpressure due to regulating valve failure. ； A filter should also be installed in front of the regulating valve, otherwise impurities in the gas will cause damage to the regulating valve. ； Also, it is not advisable to use only one stop valve. At least a ball valve should be connected in series before the stop valve. The best way is to install another regulating valve with the same configuration. Then there are the safety relief valves, pressure, temperature gauges/sensors and other ancillary equipment. Finally, it is recommended to use ball valves instead of gate valves in such a system. The comparison between ball valves and gate valves has been mentioned in many posts on the forum.
Process pipeline——Gate valve——Self-operated pressure regulating valve——Gate valve————Process pipeline | | ——— Gate valve———— Stop valve———— Gate valve—————— This modification is enough.
Why use so many gate valves? Remove the bypass gate valve, and what materials are used in the process pipeline. Why choose a gate valve?
Normally, it is enough to design a stop valve for the bypass valve of a regulating valve. However, it does not cost you any money to add 2 to 3 valves. Besides, the regulating valve is in normal use, and the bypass valve is basically closed and not used. Three valves are installed. By the way, the professional counterpart on the third floor!
Process pipeline——gate valve——purge valve——self-operated pressure regulating valve————gate valve————process pipeline | | ——— ———— Stop valve——————————————The purge valve is necessary. During maintenance, the purge material must be discharged. Only then can the regulating valve be dismantled to inspect the function of the globe valve. The main reason is that there is a problem with the regulating valve and it needs to be bypassed. Set without affecting production