What is a protective gate valve

Protective valve is a one-to-one valve in various pipelines in civil air defense engineering, which requires a production license for civil air defense products. Other gates, such as performance stable valves, are used in workshops of factories and mines. The functions of protective valves and performance stable valves are completely different. The difference is that protective valves are generally used in civil defense engineering, while performance stable valves are used in factories, mines, and workshops. A protective valve is a valve installed to prevent impact and nuclear, chemical, and biological warfare agents from entering the interior of the project through pipelines. Due to the storage of water inside the air defense basement, the protective valve on the water supply can be closed during an air raid alarm to cut off the connection with the outside world and prevent shock waves and nuclear, chemical, and biological warfare agents from entering the project through pipelines. Stable performance valves are generally used in workshops of factories and mines to prevent gas or other areas that are prone to combustion and explosion (such as high gas mines). Additional information: Key points for installing protective valves: Carefully check whether the models and specifications of all valves meet the design requirements. According to the valve model and factory manual, check whether they can be used under the required conditions, and conduct water or air pressure tests if necessary. In addition, check whether the packing is intact, whether the gland bolts have sufficient adjustment allowance, and whether the valve stem and disc are flexible, whether they are stuck or skewed. The sealing surface of the valve disc needs to be tightly closed. For valves with threaded connections, the quality of the threads should be checked. Unqualified valves cannot be installed and should be stacked separately or marked. Remove debris from the valve. When lifting the valve, do not tie the rope to the handwheel or valve stem to avoid damaging these components. It should be tied to the flange.