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(wú)信號(hào)：①調(diào)節(jié)器故障。②信號(hào)管泄漏。③定位器波紋管漏氣。④調(diào)節(jié)網(wǎng)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(wú)氣源：①過(guò)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(wú)輸出：定位器的節(jié)流孔堵塞。

d. The positioner has air source and no output: the orifice of the positioner is blocked.

e.有信號(hào)、無(wú)動(dòng)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(jié)或焦塊污物。⑤執(zhí)行機(jī)構(gòu)彈簧因長(zhǎng)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(diào)節(jié)閥的動(dòng)作不穩(wěn)定，故障現(xiàn)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(wěn)定：①壓縮機(jī)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(hào)壓力不穩(wěn)定：①控制系統(tǒng)的時(shí)間常數(shù)(T=RC)不適當(dāng)。②調(diào)節(jié)器輸出不穩(wěn)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(wěn)定，信號(hào)壓力也穩(wěn)定，但調(diào)節(jié)閥的動(dòng)作仍不穩(wěn)定：①定位器中放大器的球閥受臟物磨損關(guān)不嚴(yán)，耗氣量特別大時(shí)會(huì)產(chǎn)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(zhí)行機(jī)構(gòu)剛性太小。⑤閥桿運(yùn)動(dòng)中摩擦阻力大，與相接觸部位有阻滯現(xiàn)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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