Fully open closed high-pressure safety valve

【The function of fully open closed high-pressure safety valve】
The fully open closed high-pressure safety valve plays a safety protection role in the system. When the system pressure exceeds the specified value, the safety valve opens and releases a portion of the gas/fluid in the system into the atmosphere/pipeline, ensuring that the system pressure does not exceed the allowable value and preventing accidents due to excessive pressure.
【Materials and connection dimensions of fully open closed high-pressure safety valve components】

【Adjustment steps for opening pressure of fully open closed high-pressure safety valve】
① Before the safety valve leaves the factory, its opening pressure should be adjusted one by one to the set value required by the user. If the user requests the working pressure level of the springThen adjust the factory according to the lower limit value of the pressure level as usual.
② Before installing the safety valve onto the protected equipment or before installation, the user must readjust it at the installation site to ensure the set pressure of the safety valveThe value meets the requirements.
③ Within the working pressure range indicated on the nameplate, the opening pressure can be adjusted by rotating the adjusting screw to change the compression of the spring.
④ Before rotating the adjusting screw, the inlet pressure of the valve should be reduced to below 90% of the opening pressure to prevent the valve disc from being driven to rotate when rotating the adjusting screw, which may damage the sealing surface.
⑤ To ensure accurate opening pressure values, the medium conditions during adjustment, such as medium type, temperature, etc., should be as close as possible to the actual operating conditions. When the type of medium changes, especially when the accumulated state of the medium is different (such as from liquid phase to gas phase), the opening pressure often changes. When the working temperature increases, the opening pressure generally decreases. Therefore, when adjusted at room temperature and used for high temperatures, the set pressure value at room temperature should be slightly higher than the required opening pressure value. The degree to which it is high is related to the valve structure and material selection, and should be based onShanghai Zhenggang Valve FactoryThe explanation is based on.
⑥ The conventional safety valve is used to fix the additional back pressure. When the opening pressure is adjusted after inspection (the back pressure is atmospheric pressure at this time）The setting value should be the required opening pressure value minus the additional back pressure value.
【Common faults of fully open closed high-pressure safety valves】
The valve disc does not return to its seat after discharge
This is mainly caused by the bent valve stem of the spring, improper installation position of the valve disc, or being stuck. Should be reassembled.
leak
Under normal operating pressure of the equipment, leakage exceeding the allowable level occurs between the valve disc and the sealing surface of the valve seat. The reason is that there is dirt between the valve disc and the sealing surface of the valve seat. Can use a lifting wrenchOpen the valve several times to flush away the dirt; Sealing surface damage. According to the degree of damage, repair should be carried out by grinding or grinding after turning; The valve stem is bent, tilted, or the lever and fulcrum are skewed, causing the valve core to be misaligned with the valve disc. Should be reassembled or replaced; The elasticity of the spring decreases or loses its elasticity. Measures such as replacing the spring and readjusting the opening pressure should be taken.
Do not open when the specified pressure is reached
The reason for this situation is inaccurate constant pressure. The compression amount of the spring or heavy hammer should be readjustedThe location; The valve disc is stuck to the valve seat. Regular manual air release or water discharge tests should be conducted on safety valves; The lever of the lever type safety valve is stuck or the heavy hammer is moved. The position of the heavy hammer should be readjusted and the lever should move freely.
The pressure continues to rise after exhaust
This is mainly because the displacement of the selected safety valve is smaller than the safety discharge capacity of the equipment, and a suitable safety valve should be re selected; The centerline of the valve stem is not aligned or the spring is rusted, which prevents the valve disc from opening to the desired height. The valve stem should be reassembled or the spring replaced; The exhaust pipe section is insufficient, and an exhaust pipe that meets the safe emission area should be used.
Open below the specified pressure
Mainly due to inaccurate constant pressure; The spring has aged and its elasticity has decreased. The adjusting screw should be tightened appropriately orReplace the spring.

Ordering Notice:

1、 ① Product name and model of fully open closed high-pressure safety valve ② Diameter of fully open closed high-pressure safety valve ③ Does the fully open closed high-pressure safety valve come with accessories for us to correctly select for you.

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