The Harm of Abnormal Pressure Boost in the Cavity of Gate Valve

The formation of abnormal pressure boost will occur surprisingly similarly in many gate valve applications, because the two elements of its occurrence are similar in many industrial systems, that is, the system medium changes from a cold state to a hot state after starting up; Off in hot state, on in hot state. Therefore, if no measures are taken for the system, the damage to the system caused by abnormal voltage boost is almost unavoidable, and there are three hazards:
(1) Damage to the valve itself
The strength of the valve shell, bonnet and valve stem parts is generally designed according to the nominal pressure of the valve. When the pressure is increased abnormally, the opening pressure will be doubled, resulting in a double increase in the service stress of the relevant parts. When the actual stress of the material When the allowable stress is exceeded, the high-stress parts will be fractured and damaged, resulting in the failure of the valve to open, and the whole valve will be damaged or scrapped.
(2) Destruction of system security
It is obvious that pressure-bearing parts such as shells and bonnets are very dangerous when they are over-pressurized. Once over-pressured, the weak parts may be perforated first, causing medium leakage; the packing and self-sealing ring parts are often washed out by high-pressure fluid. , causing a large amount of medium leakage. When the medium is high-temperature gas, toxic gas, or harmful gas, it will be more serious, and even cause damage to equipment and personnel.
(3) Huge loss to the production control process
The normal opening and closing of valves is the key to the control of various industrial processes. Once this control cannot be realized, the system must be shut down for maintenance, which will cause huge direct or indirect losses.