Shanghai Lianggong valve is no stranger to everyone. It plays an important role in our life. Valve is an improved device used to control the direction, pressure and flow of fluid in the fluid equipment system. It is a device that can make the medium in piping and equipment flow or stop and control its flow. The valve is generated with the generation of fluid pipeline. How many pressure test methods are there for the valve? Let's follow Lianggong valve to learn about it!

1、隔膜阀的试压方法

1. Pressure test method of diaphragm valve

隔膜阀强度试验从任一端引入介质，开启阀瓣，另一端封闭，试验压力升规定值后，看阀体和阀盖无渗漏为合格。然后降压密封性试验压力，关闭阀瓣，打开另一端进行检查，无渗漏为合格。

In the strength test of diaphragm valve, the medium is introduced from either end, the valve disc is opened, and the other end is closed. After the test pressure rises to the specified value, it is qualified if there is no leakage in the valve body and bonnet. Then depressurize to the sealing test pressure, close the valve disc, open the other end for inspection, and it is qualified if there is no leakage.

2、截止阀和节流阀的试压方法

2. Pressure test method of stop valve and throttle valve

截止阀和节流阀的强度试验，通常将组装好的阀门放在试压架中，打开阀瓣，注入介质规定值，检查阀体和阀盖是否冒汗和渗漏。也可单件进行强度试验。密封性试验只做截止阀。试验时截止阀的阀杆成垂直状态，阀瓣开启，介质从阀瓣底下一端引入规定值，检查填料和垫片处;待合格后关闭阀瓣，打开另一端检查是否有渗漏。如果上海良工阀门强度和密封性试验都要做时，可先做强度试验，然后降压密封性试验规定值，检查填料和垫片处;再关闭阀瓣，打开出口端检查密封面是否渗漏。

For the strength test of stop valve and throttle valve, the assembled valve is usually placed in the pressure test frame, the valve disc is opened, the medium is injected to the specified value, and the valve body and bonnet are checked for sweating and leakage. The strength test can also be carried out on a single piece. The sealing test is only for the stop valve. During the test, the valve stem of the stop valve is vertical, the valve disc is opened, the medium is introduced from the lower end of the valve disc to the specified value, and the packing and gasket are checked; After passing the inspection, close the valve disc and open the other end to check whether there is leakage. If the strength and sealing test of Shanghai Lianggong valve are required, the strength test can be carried out first, then the pressure can be reduced to the specified value of sealing test, and the packing and gasket shall be checked; Then close the valve disc, open the outlet end and check whether the sealing surface leaks.

3、闸阀的试压方法

3. Pressure test method of gate valve

闸阀的强度试验与截止阀一样。闸阀的密封性试验有两种方法。

The strength test of gate valve is the same as that of stop valve. There are two methods for sealing test of gate valve.

①闸板开启，使阀内压力升规定值;然后关闭闸板，立即取出闸阀，检查闸板两侧密封处有否渗漏或者直接往阀盖上的堵头内注入试验介质规定值，检查闸板两侧密封处。以上方法叫做中间试压。这种方法不宜在公称通径DN32mm以下的闸阀做密封试验。

① The ram is opened to raise the pressure in the valve to the specified value; Then close the ram, take out the gate valve immediately, check whether there is leakage at the seals on both sides of the ram, or directly inject the test medium into the plug on the valve cover to the specified value, and check the seals on both sides of the ram. The above method is called intermediate pressure test. This method is not suitable for sealing test on gate valves with nominal diameter below dn32mm.

②另一种方法是将闸板开启，使阀门试验压力升规定值;然后关闸板，打开一端盲板，检查密封面是否渗漏。再倒头，作以上重复试验合格为止。

② The other method is to open the ram to raise the valve test pressure to the specified value; Then close the ram, open the blind plate at one end and check whether the sealing surface leaks. Then turn over and repeat the above tests until they are qualified.

气动闸阀填料和垫片处密封性试验应在闸板密封性试验之前进行。

The tightness test at the packing and gasket of pneumatic gate valve shall be carried out before the ram tightness test.

4、蝶阀的试压方法

4. Pressure test method of butterfly valve

气动蝶阀的强度试验与截止阀一样。蝶阀的密封性能试验应从介质流人端引入试验介质，蝶板应开启，另一端封闭，注入压力规定值;检查填料和其他密封处无渗漏后，关闭蝶板，打开另一端，检查蝶板密封处无渗漏为合格。作为调节流量用的蝶阀可不做密封性能试验。

The strength test of pneumatic butterfly valve is the same as that of stop valve. For the sealing performance test of butterfly valve, the test medium shall be introduced from the medium flow end, the butterfly plate shall be opened, the other end shall be closed, and the injection pressure shall reach the specified value; After checking that there is no leakage at the packing and other seals, close the butterfly plate, open the other end, and check that there is no leakage at the seal of the butterfly plate. The butterfly valve used for regulating flow may not be subject to sealing performance test.