The opening and closing parts of the hard seal gate valve are the ram. The movement direction of the ram is perpendicular to the fluid direction. The gate valve can only be fully opened and closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most common mode gate valve form wedges, and the wedge angle varies with the valve parameters, usually 50'. When the medium temperature is not high, it is 2°52'. The gate of wedge gate valve can be made into a whole, which is called rigid gate; It can also be made into a ram that can produce slight deformation to improve its processability and compensate for the deviation of sealing surface angle during processing. This ram is called elastic ram.