can gate valves be installed upside down

- Apr 17, 2020-

Can gate valves be installed upside down

Globe valve, throttle valve, pressure reducing valve, check valve and other valves have directionality. If the throttle valve is installed reversely, the service effect and service life will be affected. If the pressure reducing valve does not work at all, the check valve will even cause danger.

For general valves, there is a direction mark on the valve body; if not, it should be correctly identified according to the working principle of the valve.

The valve cavity of the stop valve is not symmetrical. The fluid should be allowed to pass through the valve port from bottom to top, so that the fluid resistance is small (determined by the shape), the opening is labor-saving (due to the upward pressure of the medium), and the medium is not pressurized after the closing, which is convenient for maintenance. This is the reason why the stop valve can not be reversed. Other valves have their own characteristics.

The installation position of the valve must be convenient for operation; even if the installation is temporarily difficult, the long-term work of the operator should also be considered.

The hand wheel of Zui valve should be aligned with the chest (generally 1.2m away from the operating floor), so that the opening and closing of the valve is more economical. The hand wheel of landing valve shall face up, and do not tilt to avoid awkward operation. The valve of the wall leaning machine and the equipment shall also leave room for the operator to stand. It is not safe to operate in the sky, especially in acid and alkali, toxic media, etc.

Do not install the gate valve upside down (i.e. the hand wheel is downward), otherwise, the medium will remain in the valve cover space for a long time, which is easy to corrode the valve stem, and is forbidden by some process requirements. At the same time, it is inconvenient to change the packing.

1. The pressure relief valve shall be installed vertically on the horizontal pipeline and shall not be inclined in all directions.

2. When installing the lift check valve, make sure that the valve disc is vertical, so that the lift is flexible.

3. The swing check valve shall be installed with its pin shaft horizontal so that it can swing flexibly.

4. Open stem gate valve shall not be installed underground, otherwise exposed stem will be corroded due to humidity.

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