A brief introduction to the open spherical gate valve
Upload time：2023-05-03 16:28:23Clcks：
The opening and closing part of the gate valve is a gate, and the direction of movement of the gate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and is not suitable for adjustment and throttling. The gate has two sealing surfaces. The two sealing surfaces of the commonly used wedge gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 5o. The gate of the wedge gate valve can be made as a whole, which is called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its manufacturability and compensate for the deviation of the sealing surface angle during processing. This kind of gate is called an elastic gate.
The types of gate valves can be divided into wedge gate valves and parallel gate valves according to the sealing surface configuration. Wedge gate valves can be further divided into: single gate type, double gate type and elastic gate type; parallel gate valves can be divided into single gate type and double gate type. According to the thread position of the valve stem, it can be divided into two types: rising stem gate valve and dark stem gate valve. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, relying on the medium pressure to press the sealing surface of the gate plate to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most of the gate valve is forced seal, that is to say, when the valve is closed, the gate should be pressed to the valve seat by external force, so as to ensure the sealing surface sealing. The utility model relates to an open spherical gate valve, which comprises a valve body,
Bonnet, bracket, valve stem and gate plate. The valve stem is connected with the gate plate in the valve body. The gate plate is composed of a wedge-shaped cone and a spherical disc connected by dovetail grooves on both sides of the wedge-shaped cone. The upper and lower sides of the spherical valve disc are respectively provided with a limit ring and a limit plate. The valve stem is connected with the wedge-shaped cone. The valve stem is equipped with a horizontal pin. Hongfeng believes that the utility model overcomes the defects of large moving distance of the gate plate, long opening and closing time, and fast wear of the sealing surface when the existing gate valve is opened and closed, and has the advantages of fast opening and closing speed, no relative friction between the sealing pairs, labor-saving operation, and long service life.
Gate valves have the following advantages:
1. The fluid resistance is small, and the sealing surface is less eroded and eroded by the medium.
2. Opening and closing is more labor-saving.
3. The flow direction of the medium is not restricted, without disturbing the flow and reducing the pressure.
4. The shape is simple, the structural length is short, the manufacturing process is good, and the application range is wide.
Nominal pressure or pressure level: PN1.0-16.0MPa, ANSI CLASS 150-300LB, JIS10-20K
Nominal diameter or caliber: DN10～1000, NPS 1/2～36"
Connection method: flange, butt welding, thread, etc.
Applicable temperature: -196℃～700℃
Drive mode: manual, bevel gear transmission, pneumatic, electric, hydraulic, gas-hydraulic linkage, electro-hydraulic linkage
