the relief Industrial Valves in the pressure equipment, containers, or pipe used for overpressure protection device. When equipment, containers, or in the pipeline pressure exceeds allowable values, the valve automatically open, and then released in full, to prevent equipment, containers, or in the pipeline pressure continues to rise; When the pressure drop to the specified value, the valve should be closed automatically in time, in order to protect the safe operation of the equipment, containers, or pipe. Relief valve can be directly driven by the valve inlet system pressure, in this case, the spring or a heavy hammer provide mechanical load can overcome the effect of dielectric pressure under the disc. They can be closed by a release or apply force to open or close the Industrial Valves body. Therefore, according to the drive way, and type of relief valve can be divided into direct action into straight-pilot. Within the scope of the relief valve can be opened in the height or in considerable height range open in proportion, or only in a small open height range, then suddenly open to the fully open position. Therefore, the relief valve can be divided into the proportion type and open type. Due to relief valve is a kind of automatic valve, therefore the relief valve with ordinary relief valve on the structure and performance parameters of the there is a big difference. Some special terms easily confused, in order to make customers have a more clear understanding about the relief Industrial Valves, and can correct selection, the following will be to explain some of the main terms.

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