Wenzhou Unique Valve Co., Ltd.
Effects of Abnormal Pressure Rises in the Gate Valve Cavity
Feb 07, 2021
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The abnormal pressure rise in the cavity of the gate valve will occur in many related applications, because the two major factors of its occurrence are similar in many industrial systems, that is, the medium in the system changes from a cold state to a thermal state after the system is on. The gate is closed when the medium is a cold state and opened when the medium is in a thermal state. Therefore, if no measures are taken for the system, the damage to the system caused by abnormal pressure rises is almost inevitable.
Damage to the valve itself
Generally, the strength of the valve casing, bonnet and stem is designed according to the nominal pressure of the valve. When the pressure of the valve rises abnormally, the opening pressure of the valve will multiply, causing the service stress of related parts to multiply. When the actual stress on the material exceeds the allowable stress, high stress on the parts will cause them to break. As a result, the valve can’t be opened, and the whole valve is damaged or scrapped.
Damage to piping systems
Obviously, the overpressure of the pressure-containing member such as the valve body and bonnet is very dangerous. If so, perforations may be happen to the weak area of the valve, causing valve leakage. The packing and self-sealing O-ring are often washed away by high-pressure fluid, bringing about a large amount of medium leakage. The high temperature gas, toxic gas or harmful gas will even damage equipment and cause the worker to suffer injuries.
Damage to the valve itself
Generally, the strength of the valve casing, bonnet and stem is designed according to the nominal pressure of the valve. When the pressure of the valve rises abnormally, the opening pressure of the valve will multiply, causing the service stress of related parts to multiply. When the actual stress on the material exceeds the allowable stress, high stress on the parts will cause them to break. As a result, the valve can’t be opened, and the whole valve is damaged or scrapped.
Damage to piping systems
Obviously, the overpressure of the pressure-containing member such as the valve body and bonnet is very dangerous. If so, perforations may be happen to the weak area of the valve, causing valve leakage. The packing and self-sealing O-ring are often washed away by high-pressure fluid, bringing about a large amount of medium leakage. The high temperature gas, toxic gas or harmful gas will even damage equipment and cause the worker to suffer injuries.
