American standard gate valve
introduction
The opening and closing part of the 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 model 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 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 an resilient gate.
Advantages
details
Real stuff
The wall thickness is clear at a glance, forged with care, long service life, forged appearance, long service life, beautiful and smooth appearance
Polished
The surface of the valve body is carefully polished, as smooth as a mirror, with a strong metallic feel and is not easy to hurt your hands.
Flange face
Thickening the valve body can increase the pressure-bearing pressure to a higher level under the same pressure-bearing conditions, making safety more secure.
Application specifications
Classification
According to the sealing surface configuration, it can be divided into wedge gate gate valve and parallel gate gate valve. Wedge gate gate valve can be further divided into: single gate type, double gate type and resilient gate type; parallel gate gate valve can be divided into single gate type. Plate 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 non rising stem gate valve.
The following matters should be paid attention to when installing and maintaining gate valves: 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.
Advantages
1. Small fluid resistance. The internal mass channel of the valve body is straight, the mass flows in a straight line, and the flow resistance is small.
2. Water hammer is not easy to occur. The reason is the long shutdown time.
3. Simple shape, short structural length and good manufacturing process. Scope of application
4. When fully open, the sealing surface is less eroded by the working mass than that of the stop valve.
5. The body shape is relatively simple and the casting process is good.
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