In metallurgical industry, it is a necessary controlling unit to adjust the pressure in the in industrial furnace by valve and position controlling system of the valve.
在冶金生产过程中，通过阀门及其位置控制系统来调节工业炉内的压力是必不可少的控制环节。
Meanwhile, the flap valve can be used to adjust weight, spring tension and the bottom outlet valve flap valve opening size to determine the pressure and open and close time.
同时，可以利用调整阀瓣的自重、弹簧的弹力以及阀瓣的底孔大小来确定阀门的开启压力和启闭时间。
In the lack of condition for the pressure test, it is not allowed to remove the lead sealing of the reversing valve to adjust the pressure regulating button.
在不具备压力试验条件时，不允许拆掉换向阀的铅封和调整调压弹簧座。
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