And even that is only during winter when and if you drain the batch heater and use regular water pressure.
甚至乎只有在冬季，在你排空批量加热器、采用正常水压的时候才有压力。
2
The filter pressure drainage and drainage are two ways to manually drain. Manual drainage when the water level below the level reached before the filter must be excluded.
本过滤器排水有压差排水与手动排水二种方式。手动排水时当水位达到滤芯下方水平之前必须排除。
3
A small valve or faucet used to drain or reduce pressure, as from a boiler.