Expanding Gate Valve
The opening and closing part of the gate valve is the gate, the movement direction of the gate is perpendicular to the direction of the fluid, and the gate valve can only be fully opened and closed, and cannot be adjusted and throttled. The gate has two sealing surfaces, the two sealing surfaces of the most commonly used mode gate valve form a wedge, the wedge angle varies with the valve parameters, usually 5°, and 2°52 when the medium temperature is not high. The gate of the wedge-type gate valve can be made into a whole, called a rigid gate; it can also be made into a gate that can produce a small amount of deformation to improve its workmanship and make up for the deviation caused by the angle of the sealing surface during the processing, this gate is called an elastic gate. When the gate valve is closed, the sealing surface can be sealed only by the medium pressure, that is, the sealing surface of the gate is pressed to the seat on the other side by the medium pressure to ensure the sealing of the sealing surface, which is called self-sealing. Most gate valves are forced to seal, that is, when the valve is closed, it is necessary to rely on external force to force the gate to the seat to ensure the sealing of the sealing face. The gate of the gate valve along with the stem for linear movement, is called the lifting rod gate valve, also known as the open rod gate valve.
1.The installation position, height, import and export direction must meet the design requirements, and the connection shall be firm and tight.
2. All kinds of manual valves installed on the insulation pipe, the handle shall not be downward.
3.The valve must carry on the appearance inspection before the installation, the valve nameplate should comply with the current national standard < general valve mark > gb12220 stipulation. For valves whose working pressure is greater than 1.0mpa and which are cut off on the main pipe, the strength and tight performance test shall be carried out before installation, and shall be used only after qualified. strength test, the test pressure is 1.5 times the nominal pressure, the duration is not less than 5min, valve shell, packing should be qualified without leakage. when tightness test, the test pressure is 1.1 times of the nominal pressure; the test pressure shall meet the gb50243 standard for the duration of the test, and the disc sealing face shall be qualified without leakage.
4. The handwheel, handle and transmission mechanism are not allowed for lifting, no collision. The gate valve with transmission mechanism shall be installed in accordance with the specifications of the product.
Our company is specialized in manufacturing and various valves . To guarantee good quality, we follow ISO9001 standards to inspect our goods. From raw material purchase to pre-shipment inspection, we keep an eye on every step to ensure the satisfaction of our customer on quality.