Structure Description of Balanced Pneumatic Globe Valve
Classification:
Release Time：2020-07-30
Balanced pneumatic globe valve refers to the switch part of the plug-shaped valve, the valve, the sealing surface is flat or conical, the valve along the fluid centerline linear movement. The movement of the valve stem has the lifting rod type (the valve stem rises and falls, but the hand wheel does not rise and fall) and the lifting rotating rod type (the hand wheel rotates and rises and falls together with the valve stem, and the nut is installed on the valve body). The stop valve is only suitable for full opening and full closing, and no adjustment and throttling are allowed. When the balanced pneumatic cut-off valve is opened, when the opening height of the valve is 25% ~ 30% of the nominal diameter, it means that the valve has reached the fully open position. Therefore, the fully open position of the cut-off valve should be determined by the stroke of the valve disc.
Balanced pneumatic stop valveRefers to the switch part of the plug-shaped disc, the valve, the sealing surface is flat or conical, the disc along the fluid center line linear movement. The movement of the valve stem has the lifting rod type (the valve stem rises and falls, but the hand wheel does not rise and fall) and the lifting rotating rod type (the hand wheel rotates and rises and falls together with the valve stem, and the nut is installed on the valve body). The stop valve is only suitable for full opening and full closing, and no adjustment and throttling are allowed. When the balanced pneumatic stop valve is opened, when the opening height of the disc is 25% of the nominal diameter ~ At 30%, it means that the valve has reached the fully open position. Therefore, the fully open position of the cut-off valve should be determined by the stroke of the valve flap. According to this form of movement, the change of the valve seat opening is proportional to the stroke of the valve flap. Because the opening or closing stroke of the valve stem is relatively short, and it has a very reliable cutting function, and because the change of the valve seat opening is proportional to the stroke of the valve disc, soBalanced pneumatic stop valveVery suitable for regulating flow. Therefore, the shut-off valve is very suitable for cutting off or regulating and throttling.
Nominal pressure: PN1.0-16.0 MPa, ANSI 150-900, JIS10-20K
Nominal size: DN10 ~ 500,NPS 1/2~36'
Connection mode: flange connection, butt welding connection, threaded connection, etc.
Balanced pneumatic stop valveApplicable temperature:-196~700
Drive mode: manual, pneumatic, electric, hydraulic and pneumatic
Body materials: WCB, ZG1Cr18Ni9Ti, ZG1Cr18Ni12Mo2Ti, CF8(304), CF3(304L), CF8M(316), CF3M(316L) and Ti.
Applicable medium: different materials are selected, and the valve can be applied to water, steam, oil, nitric acid, acetic acid, oxidation medium, urea and other media.
Working principle of balanced pneumatic globe valve
The closing principle of the globe valve is to make the sealing surface of the valve clack and the sealing surface of the valve seat closely fit through the pressure of the valve stem to prevent the flow of the medium.
The advantages of the valve are as follows:
1. Simple structure, convenient manufacture and maintenance.
2. The stop valve has short working stroke and short opening and closing time.
3. Good sealing performance, small friction between sealing surfaces and long service life.
Balanced pneumatic stop valveThe disadvantages are as follows:
1. The fluid resistance is large, and the force required to open and close is large.
2. It is not suitable for medium with large particles, high viscosity and easy coking.
3. The regulation performance of the stop valve is poor.
According to the position of the stem thread, the type of stop valve is divided into external thread type and internal thread type. According to the flow direction of the medium, there are straight cut-off valves, straight cut-off valves and corner cut-off valves. Globe valve is divided into sealed forms, including packing seal globe valve and bellows seal globe valve. the structure of the valve:
Balanced pneumatic globe valve body has straight-through, straight-through and right-angle structure. Straight-through is a common structure, but its fluid resistance is large. The DC fluid has low resistance and is mainly used for fluids containing solid particles or high viscosity. Right-angle valve bodies are mostly forged and are suitable for globe valves with smaller passages and higher pressures.
Installation and maintenanceBalanced pneumatic stop valveNote:
1. Handwheel and handle operated shut-off valve can be installed in any position of the pipeline.
2. Handwheel, handle and transmission mechanism are not allowed to be used for lifting.
3. The flow direction of the medium should be consistent with the direction shown by the arrow in the valve body.
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2026/02/28
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