First close manual shutoff located before the fill-valve, then draw system pressure down to 12psi (or other presetpressure) and observe system for pressure buildup several hours later.
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。
3
Because of the dual-orifice design, there is a preset controlled pressure differential for the secondary steam system, while maximum pressure differential is available to discharge the condensate.