Shut-off valve
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Details
The opening and closing part of the stop valve (Globe Valve) is a plug-shaped disc, the sealing surface is flat or sea-cone, and the disc moves linearly along the centerline of the valve seat. The movement form of the valve stem, (common name: dark rod), also has a lifting and rotating rod type that can be used to control various types of fluids such as air, water, steam, various corrosive media, mud, oil, liquid metal and radioactive media. flow. Therefore, this type of shut-off valve is very suitable for cutting or regulating and throttling. Because the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, it is very suitable for flow adjustment.
Features:
(1) The structure of the stop valve is simpler than that of the gate valve, and it is more convenient to manufacture and maintain.
(2) The sealing surface is not easy to wear and scratch, and the sealing performance is good. There is no relative sliding between the valve disc and the sealing surface of the valve body when opening and closing, so the wear and scratch are not serious, the sealing performance is good, and the service life is long.
(3) When opening and closing, the stroke of the disc is small, so the height of the stop valve is smaller than that of the gate valve, but the structural length is longer than that of the gate valve.
(4) The opening and closing torque is large, the opening and closing is laborious, and the opening and closing time is long.
(5) The fluid resistance is large, because the medium channel in the valve body is tortuous, the fluid resistance is large, and the power consumption is large.
(6) When the nominal pressure of the medium flow direction is PN≤16MPa, it generally adopts downstream flow, and the medium flows upward from the bottom of the valve disc; when the nominal pressure PN≥20MPa, generally adopts reverse flow, and the medium flows downward from the top of the valve disc. To increase the performance of the seal. When in use, the globe valve medium can only flow in one direction, and the flow direction cannot be changed.
(7) The disc is often eroded when fully open.
The stem axis of the globe valve is perpendicular to the sealing surface of the valve seat. The opening or closing stroke of the valve stem is relatively short, and it has a very reliable cut-off action, making this valve suitable for cutting or regulating and throttling the medium.
shortcoming
1. The fluid resistance is large, and the force required for opening and closing is relatively large.
2. It is not suitable for media with particles, high viscosity and easy to coke.
3. Poor adjustment performance.
Advantage
1. Double sealing design (bellows + packing) If the bellows fails, the stem packing will also be avoided;
2. External leakage, and in line with international sealing standards;
3. There is no fluid loss, reducing energy loss and improving the safety of factory equipment;
4. Long service life, less maintenance times and lower operating costs;
5. The strong and durable bellows seal design ensures zero leakage of the valve stem and provides maintenance-free conditions.
6. The bellows seal globe valve adopts the design of bellows seal, which completely eliminates the shortcomings of ordinary valve stem packing seal aging and easy leakage. It not only improves the energy efficiency, increases the safety of production equipment, but also reduces maintenance costs and frequent maintenance. Maintenance, also provides a clean and safe working environment.
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