Japanese standard gate valve is a type of gate valve. Its production standards are produced according to Japanese standards. The opening and closing component of a gate valve is the gate, and the movement direction of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully open and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces, and the most commonly used mode is that the two sealing surfaces of the gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50, and is 2 ° 52 'when the medium temperature is not high. The gate plate of the wedge gate valve can be made into a whole, called a rigid gate plate; It can also be made into a gate that can produce slight deformation to improve its processability and compensate for the deviation of the sealing surface angle during the processing. This type of gate is called an elastic gate. The types of gate valves can be divided into wedge gate valve and parallel gate valve according to the sealing surface configuration. Wedge gate valve can be further divided into single gate pole type, double gate plate type, and elastic gate plate type; Parallel gate valves can be divided into single gate and double gate types. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valves and non rising stem gate valves.