Stop valve, throttle valve, pressure reducing valve, check valve and other valves are directional. If they are installed upside down, the throttle valve will affect the service effect and service life; The pressure reducing valve does not work at all, and the check valve can even cause danger.

For general valves, there are direction marks on the valve body; If not, it shall be correctly identified according to the working principle of the valve.

The valve cavity of the stop valve is asymmetric from left to right. The fluid should 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 does not press the packing after closing, which is convenient for maintenance. This is why the stop valve cannot be reversed. Other valves also 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 be considered.

It is best to align the valve handwheel with the chest (generally 1.2m away from the operating floor), so as to save effort in opening and closing the valve. The hand wheel of the landing valve shall be upward and not inclined to avoid awkward operation. For the valves near the wall machine and equipment, the room for the operator to stand shall also be reserved. Avoid upward operation, especially acid-base and toxic media, otherwise it is very unsafe.

Do not install the gate valve upside down (i.e. the hand wheel is downward), otherwise the medium will remain in the bonnet space for a long time, which is easy to corrode the valve stem, and is contraindicated by some process requirements. It is very inconvenient to replace the packing at the same time.

1. The pressure reducing valve shall be installed vertically on the horizontal pipeline without tilting in all directions.

2. When installing the lift check valve, ensure that its disc is vertical so that it can be lifted flexibly.

3. For swing check valve, ensure that its pin shaft is horizontal during installation, so as to rotate flexibly.

4. Do not install the rising stem gate valve underground, otherwise the exposed stem will be corroded due to humidity.