The selection of wedge gate valve is generally based on the following principles: 1. Requirements for valve fluid characteristics. Gate valves are selected for working conditions with small flow resistance, strong flow capacity, good flow characteristics and strict sealing requirements.

Among various types of valves, the gate valve is the most widely used one. It is generally only suitable for fully open and fully closed, cannot be used for adjustment and throttling.

The sealing principle of the wedge gate valve is sealed by the tight combination of the two sealing surfaces on the wedge disc and the two sealing surfaces on the valve body when wedging. The purpose of using the wedge disc is to increase the auxiliary sealing load, so that the metal-sealed wedge gate valve can seal both high medium pressure and low medium pressure.

The disc of the wedge gate valve is wedge-shaped, and the purpose of using the wedge shape is to increase the auxiliary sealing load, so that the metal-sealed wedge gate valve can not only ensure high medium pressure sealing, but also low medium pressure. In this way, a metal-sealed wedge gate valve can achieve a higher potential level of sealing than a common metal-sealed parallel gate valve.

Under the action of the fluid pressure flowing in one direction, the valve disc opens, when the fluid flows in the opposite direction, the fluid pressure and the self-coincidence of the valve disc act on the valve seat, thereby cutting off the flow. Among them, the swing check valve belongs to this