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.

The purpose of using a check valve is to prevent the reverse flow of the medium, and a check valve is generally installed at the outlet of the pump. In addition, a check valve should also be installed at the outlet of the compressor. In short, in order to prevent the reverse flow of the medium, a check valve should be installed on the equipment, device or pipeline.

The disc of the ball check valve is a sphere covered with rubber or engineering plastic, so its sealing performance is reliable. Ball check valve can be divided into single ball and multi-ball according to the size of its nominal diameter.

The disc of the swing check valve rotates around the rotating shaft in the valve body. The axis of the rotating shaft must be on the same plane as the sealing surface of the valve body to ensure the sealing when closed.

The structure of the lift check valve is generally similar to that of the globe valve, and its disc is raised and lowered along the centerline of the channel.