Ball valves in the use of water, also plays a non-negligible role, but for a long time there will be some problems, which will affect the specific functionality, it is necessary to understand clearly at this time.
The gate should not be inverted (that is, the handwheel is down), otherwise the medium will be retained in the cover space for a long time, easy to corrode the stem, and for some process requirements taboo. It is extremely inconvenient to replace packing at the same time. Open STEM GATE VALVES, DO NOT INSTALL underground, otherwise due to damp corrosion of the exposed stem. Lift check valve, installation to ensure that the valve disc vertical, so that the lift flexible.