Installed in a mainline it prevents upstream pressure from dropping below a preset minimum. Solenoid override of the sustaining function allows for electrical on-off operation.

安装在主管线内，防止上游压力降到预置最小压力以下。电磁阀的过载平衡功能使其能够进行电气开-关操作。

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Solenoid or manual operation, press the button and rotate manual operation can achieve a state of lock manually. Reset pneumatic spring, mechanical spring reset, reset electromagnet operation.

电磁铁或手动操作，按下并旋转手动操作钮可实现手动状态锁定。气动弹簧复位、机械弹簧复位、电磁铁操作复位。

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This machine is furnished with solenoid braking motor and other safety devices and can be adjusted and operated during operation.

本机配有电磁制动电动机和其它安全保护装置，运行时也能调整与操作。

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