Common faults and causes of self-operated steam regulating valves
date:2025-12-03 08:25
1. No signal, no air source. ① The air source is not turned on, ② The air source contains water, which freezes in winter, causing blockage of the air duct or malfunction of the filter or pressure reducing valve due to blockage, ③ Compressor failure; ④ Leakage in the main air source pipe.
2. There is a gas source but no signal. ① The regulator is faulty, ② the signal pipe is leaking; ③ the bellows of the positioner is leaking; ④ the regulating diaphragm is damaged.
3. The positioner has no air source. ① The filter is blocked; ② The pressure reducing valve is faulty; ③ The pipeline is leaking or blocked.
4. The positioner has an air source but no output. The throttle hole of the positioner is blocked.
5. There is a signal but no action. ① The valve core falls off; ② The valve core is stuck with the society or the valve seat; ③ The valve rod is bent or broken; ④ The valve seat and valve core are frozen or contaminated with coke; ⑤ The actuator spring is rusted due to long-term disuse
