Vacuum solenoid valve, is used for vacuumpiping system, or vacuum equipment, electromagnetic valve is used to control the vacuum.
是指用于真空负压管道系统，或者真空设备上，用来控制真空的开关的电磁阀。
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6although the vacuumpiping system passes the gas leakage test it shall also bear a test of vacuum degree prior to the linkage trial run of the vacuum system.
6真空管道在气体泄漏性试验合格后，真空系统联动试运转时，还应进行真空度试验。
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Piping service include fire protection piping, chilled process piping, hot water pipings, steam piping, hot vacuumpiping, cold vacuumpiping. drain water, city water piping etc.