a.無信號、無氣源：①氣源未開。②由于氣源含水在冬季結冰，導致風管堵塞或過濾器、減壓閥堵塞失靈。③壓縮機故障。④氣源總管泄漏。
a. No signal and no air source: ① the air source is not turned on. ② Because the water in the air source freezes in winter, the air duct is blocked or the filter and pressure reducing valve are blocked and fail. ③ Compressor failure. ④ Leakage of air supply main pipe.
b.有氣源，無信號：①調節器故障。②信號管泄漏。③定位器波紋管漏氣。④調節網膜片損壞。
b. Air source, no signal: ① regulator failure. ② The signal tube is leaking. ③ Air leakage of positioner bellows. ④ The adjusting omentum is damaged.
c.定位器無氣源：①過濾器堵塞。②減壓閥故障。③管道泄漏或堵塞。
c. The positioner has no air source: ① the filter is blocked. ② The pressure reducing valve is faulty. ③ Leakage or blockage of pipes.
d.定位器有氣源，無輸出：定位器的節流孔堵塞。
d. The positioner has air source and no output: the orifice of the positioner is blocked.
e.有信號、無動作：①閥芯脫落，②閥芯與閥座卡死。③閥桿彎曲或折斷。④閥座閥芯凍結或焦塊污物。⑤執行機構彈簧因長期不用而銹死。
e. Signal and no action: ① the valve core falls off, and ② the valve core and valve seat are stuck. ③ The valve stem is bent or broken. ④ The valve seat and valve core are frozen or burnt and dirty. ⑤ The actuator spring is rusted due to long-term use.
(2)調節閥的動作不穩定，故障現象和原因如下：
(2) The action of the regulating valve is unstable, and the fault phenomena and causes are as follows:
a.氣源壓力不穩定：①壓縮機容量太小。②減壓閥故障。
a. Unstable air source pressure: ① the compressor capacity is too small. ② The pressure reducing valve is faulty.
b.信號壓力不穩定：①控制系統的時間常數(T=RC)不適當。②調節器輸出不穩定。
b. Unstable signal pressure: ① the time constant (t = RC) of the control system is inappropriate. ② The regulator output is unstable.
c.氣源壓力穩定，信號壓力也穩定，但調節閥的動作仍不穩定：①定位器中放大器的球閥受臟物磨損關不嚴，耗氣量特別大時會產生輸出震蕩。②定位器中放大器的噴咀擋板不平行，擋板蓋不住噴咀。③輸出管、線漏氣。④執行機構剛性太小。⑤閥桿運動中摩擦阻力大，與相接觸部位有阻滯現象。
c. The air source pressure is stable and the signal pressure is also stable, but the action of the regulating valve is still unstable: ① the ball valve of the amplifier in the positioner is not tightly closed due to dirt wear, and the output oscillation will occur when the air consumption is particularly large. ② The nozzle baffle of the amplifier in the positioner is not parallel, and the baffle cannot cover the nozzle. ③ Air leakage of output pipe and line. ④ The rigidity of the actuator is too small. ⑤ The friction resistance of the valve rod is large during the movement, and there is blocking at the contact part.
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