原文：
　 故障之一，阀门不通。原因有： ①控制通道被杂物堵塞(通道细小，容易堵塞)； ②活塞因锈渍卡在{zg}位置；虽上部受力，但不能向下移动，打不开主通道。 所以，活塞减压阀前必须安装过滤器；对于新安装或长期停用的减压阀，一定要拆开检查和清洗。 故障之二，阀门直通，不起减压作用。原因有： ①活塞在某一位置(不是{zg}位置)卡住； ②主阀阀柄在汽缸盘导向孔某一位置 (不是密合位置)卡住； ③主阀阀瓣下部弹簧断裂或失效； ④脉冲阀阀柄在阀座孔内某一位置(不是密合位置)卡住，使活塞总是受压力； ⑤主阀瓣与主阀座两密封面之间，有污物卡住或有刻痕； ⑥膜片因疲劳或损坏而失灵。 对于减压阀，特别要强调定期检查。如发现污物、锈渍要及时除去；活塞环损坏应更新；弹簧失效要换成可用的；密封面如不密合，应重新研磨；膜片不灵要更换；经使用如确认阀柄较粗，应用砂纸打磨。 三，阀后压力不能调节。除上述各种原因外，还有： ①调节弹簧失灵；②帽盖接缝泄漏，不能保持压力。 这也要靠及时检查处理来预防。 此外，还有一种现象，就是阀后压力脉冲波动，极不稳定。这是输入介质与输出介质差量太大之故，应重新选择阀径相当的阀门。还有一个造成阀后压力不稳的原因是，调节弹簧选择不当；一种公称压力的减压阀，调节弹簧有几种，例如公称压力为16公斤/平方厘米，调节弹簧就有1－3公斤/平方厘米、2－8公斤/平方厘米、7－11公斤/平方厘米三种，假如阀后压力只需1－3公斤/平方厘米，而弹簧却是7－11公斤/平方厘米的那种，阀后压力就调不准了。

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译文：
Fault, one of valve barrier. The reasons are: ① control channel of the culvert blocked (channel small, easy to plug); ② piston for rust stains card in the highest position; although the upper force, but can not move down, could not open the main channel. Therefore, the piston valve to be installed before the filter; for new installations or long-term out of the valve, must be open inspection and cleaning. The second failure, the valve through, can not afford to decompression. The reasons are: ① piston in a position (not the highest position) jam; ② the main valve stem hole in the cylinder of a disk-oriented position (not seal location) jam; ③ the main valve spring breakage or failure of the lower lobe; ④ Pulse valve stem hole in the seat of a position (not the seal location) get stuck, so that the piston is always under pressure; ⑤ main valve and main valve seat sealing surface between the two, with dirt stuck or have scored; ⑥ membrane damage due to fatigue or failure. The valve, in particular, regular checks should be emphasized. Found dirt, rust stains to be removed in a timely manner; piston ring damage should be updated; spring failure to replace available; sealing surface if not close together, should be re-grinding; patch not working need to be replaced; as identified by the use of valve handle more rough, application sandpaper. Third, the valve can not regulate the pressure. In addition to the above-mentioned reasons, there are: ① adjusting spring failure; ② cap seams leak, can not maintain the pressure. This also depends on timely check processing to prevent. There is also a phenomenon that the valve pressure pulse wave, highly volatile. This is the input medium and output medium is too big difference, therefore, to be re-select valve diameter equivalent valve. There is also a cause of instability in pressure causes the valve is properly adjusted spring choice; a nominal pressure of the valve, adjust the spring there are several, such as nominal pressure of 16 kg / square centimeter, adjust the spring have 1-3 kg / cm 2-8 kg / sq cm, 7-11 kilograms / square centimeter of three, if the pressure valve just after the 1-3 kg / square centimeter, while the spring is 7-11 kg / square centimeter of it species, the valve pressure adjustment was not allowed.