Chromolybdenum Steel Gate Valve
Stable performance
The performance has a reputation and the materials used can be seen. They have both real materials and core technologies.
Product overview
The opening and closing part of the soft seal gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, and cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used model gate valve form a wedge shape. The wedge angle varies with the valve parameters. The nominal diameter is DN50~DN1200, and the operating temperature is ≤120℃. The gate plate of the soft-sealing gate valve is integrally lined with rubber, and the rubber deformation compensation function ensures a tight seal and no leakage. The product has a wide range of applications and can be used on pipelines under various working conditions in metallurgy, coal, electric power, petroleum, chemicals, pharmaceuticals, environmental protection, water treatment and other industries with working temperatures of -20~120°C to cut off or connect pipeline media.
Product overview
The opening and closing part of the metal sealing gate valve is the gate plate. The movement direction of the gate plate is perpendicular to the direction of the fluid. The gate valve can only be fully opened and fully closed, but cannot be adjusted or throttled. The gate has two sealing surfaces. The two sealing surfaces of the most commonly used gate valve form a wedge shape. The wedge angle varies with the valve parameters, usually 50°, and 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; it can also be made into a gate that can produce slight deformation to improve its craftsmanship and compensate for the deviation of the sealing surface angle during the processing. This kind of gate The plate is called resilient gate.
Product details
Working principle
The gate plate of the gate valve moves linearly with the valve stem. There is usually a trapezoidal thread on the lifting rod. Through the nut at the top of the valve and the guide groove on the valve body, the rotational motion is changed into linear motion, that is, the operating torque is changed into operating thrust
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 to the valve seat on the other side to ensure the sealing of the sealing surface, which is self-sealing. Most gate valves adopt forced sealing, that is, when the valve is closed, external force must be relied on to force the gate plate to the valve seat to ensure the sealing performance of the sealing surface.
When the gate valve opens When the gate lift height is equal to 1:1 times of the valve diameter, the fluid channel is completely unobstructed, but during operation, this position cannot be monitored. In actual use, the top of the valve stem is used as a mark, that is, the position that does not open, as its fully open position. In order to consider the locking phenomenon due to temperature changes, the valve is usually opened to the top position and then retracted 1/2-1 turn as the fully open valve position. Therefore, the fully open position of the valve is determined by the position of the gate (that is, the stroke).
Product advantages
The fluid resistance is small, and the sealing surface is less brushed and eroded by the medium. Opening and closing requires less effort. The flow direction of the medium is not restricted, and there is no flow disturbance or pressure reduction. It has a simple shape, short structural length, good manufacturing process, and wide application range.
Precautions
The handwheel, handle and transmission mechanism are not allowed to be used for lifting, and collision is strictly prohibited.
Double-gate gate valves should be installed vertically (that is, the valve stem is in a vertical position and the handwheel is at the top).
Before opening the gate valve with a bypass valve, the bypass valve should be opened first (to balance the pressure difference between the inlet and outlet and reduce the opening force).
Gate valves with transmission mechanisms should be installed according to the product instruction manual.
If the valve is frequently used on and off, lubricate it at least once a month.
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