According to the form of sealing components, gate valves are often divided into several different types, such as: wedge gate valve, parallel gate valve, parallel double gate valve, wedge double gate gate, etc. The commonly used forms are wedge gate valves and parallel gate valves.
1. Dark rod wedge gate valve
The opening and closing part of the dark stem 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 open and fully closed, can not be adjusted and throttled. The gate plate has two sealing faces. The two sealing faces of the commonly used mode gate valve form a wedge. The wedge Angle varies with the valve parameters, usually 50, and 2°52′ when the medium temperature is not high. The gate of wedge gate valve produced by Zhejiang Star Ou valve can be made into a whole, called rigid gate; It can also be made into a gate that can produce trace deformation to improve its technology and make up for the deviation of the sealing surface Angle in the process of processing. This gate is called elastic gate.
2. Insulation gate valve
Thermal insulation gate valve is mainly used in petroleum, chemical, metallurgy, pharmaceutical and other systems, the jacket of the valve is welded between the two flanges of the valve, the side of the valve, the bottom is provided with a jacket connection, the jacket can freely flow through steam or other hot thermal insulation medium, to ensure that the viscous medium can flow smoothly through the valve.
3. Bellows gate valve
The opening and closing part of the bellows gate valve is a plug shaped disc, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid. The movement form of the valve stem, there are lifting rod type (stem lifting, handwheel not lifting), there are also lifting rotating rod type (handwheel and valve stem together rotating lifting, nut in the valve body). Ribbled globe valves are only suitable for full opening and full closing. Adjustment and throttling are not allowed. This type of valve shall generally be installed horizontally in the pipeline.
4. Stainless steel gate valve
Stainless steel gate valve nominal pressure: 1.0Mpa, 1.6Mpa, 2.5Mpa; 2, shell test pressure: P= 1.5Pn; 3. Seal test pressure: P= 1.1Pn; 4, outlet pressure: PN1.0MPa stainless steel gate valve 0.09~ 0.8Mpa, PN1.6Mpa stainless steel gate valve 0.10~ 1.2Mpa, PN2.5Mpa stainless steel gate valve 0.15~ 1.6Mpa; 5. Applicable medium: water; 6. Applicable temperature: 0℃ ~ 180℃.
5. Elastic seat seal gate valve
6. Knife gate valve
The opening and closing part of the knife gate valve is the gate plate, the movement direction of the gate plate is perpendicular to the direction of the fluid, the manual knife gate valve can only be fully open and fully closed, can not be adjusted and throttled. The gate plate has two sealing faces. The two sealing faces of the commonly used mode gate valve form a wedge. The wedge Angle varies with the valve parameters, which is usually 50. Can also make it generates trace of deformation of ram, in order to improve the manufacturability, make up for the sealing surface Angle in the process of our processing deviation, the gate is called elastic disc type knife gate valve is closed, sealing surface can only rely on medium pressure to seal, that depend on medium pressure, the disc will be to the other side of the valve seat sealing surface pressure to ensure that the seal face seal, zhejiang star ou type knife gate valve is the valve production adopts forced sealing, the valve is closed, to rely on outside force forced the ram pressure to the seat, to ensure the sealing surface of this kind of valve sealing shall generally be installed in the pipeline.
7. Low temperature gate valve
The opening and closing part of the low temperature 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 open and fully closed, not for regulation and throttling. The gate plate has two sealing faces. The two sealing faces of the commonly used mode gate valve form a wedge. 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 the rigid gate; It can also be made into a gate that can produce trace deformation to improve its technology and make up for the deviation of the sealing surface Angle in the process of processing. This gate is called elastic gate.
8. Flanged manual gate valve
Flanged gate valve is a flange gate valve connection mode, this connection mode is common. Flanged gate valve is stable and reliable when used in the pipeline, so it is wrong to use flange gate valve in the high pressure pipeline.
9. Buried gate valve
10. Open stem wedge gate valve
The type of gate valve, according to the sealing surface configuration can be divided into wedge type gate valve and parallel gate valve, wedge type gate valve can be divided into: single gate type, double gate type and flexible gate type; Parallel gate valves can be divided into single gate and double gate. According to the screw position of the stem, it can be divided into bright stem gate valve and dark stem gate valve. When the stem 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 other side of the valve seat to ensure the sealing surface, which is 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 valve seat to ensure the sealing surface of the sealing.
Cast iron gate valve with internal thread
The opening and closing part of the internal thread gate valve is a plug shaped disc, the sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid. The movement form of the valve stem, there are lifting rod type (stem lifting, handwheel not lifting), there are also lifting rotating rod type (handwheel and valve stem together rotating lifting, nut in the valve body). Ribbled globe valves are only suitable for full opening and full closing. Adjustment and throttling are not allowed.
11. Flat gate valve
A flat gate valve is a sliding valve with a parallel gate closing element. The closing member may be a single gate or a double gate with a retracting mechanism between them. The pressure of the gate to the seat is controlled by the medium pressure acting on the floating gate or the floating seat. In the case of a double disc flat gate valve, the back-up mechanism seen on the two gates can supplement this compression.
12. Double disc cast iron gate valve
Double disc cast iron gate valves are widely used in petroleum, chemical, pharmaceutical, electric power and other industries. In nominal pressure ≤ L, 0MPa steam, water, oil and other media pipeline, used for opening and closing.
Post time: Mar-24-2021