As a globe valve manufacturer in China, COVNA manufactures globe valves in manually operated, electrically operated and pneumatically operated types to meet your project requirements.
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The globe valve is a valve whose disc moves along the centerline of the valve seat. The globe valve can be used in most media flow systems. Various types of globe valves have been developed to meet various purposes in petrochemical, electric power, metallurgy, urban construction, chemical and other sectors.
According to the operation mode, it can be divided into manual globe valve, electric globe valve and pneumatic globe valve to meet your different working conditions.
According to the movement form of the valve disc, the change of the valve seat port is proportional to the valve disc stroke. Because the opening or closing stroke of the valve stem of this kind of valve is relatively short, and it has a very reliable shut-off function. At the same time, since the change of the valve seat port is proportional to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for cutting, regulating and throttling.
Once the valve disc of the globe valve is removed from the closed position, there will be no contact between its valve seat and the sealing surface of the valve disc, so its sealing surface has very little mechanical wear, so its sealing performance is very good. The disadvantage is Particles in the flowing medium may be trapped between the sealing surfaces. However, if the valve disc is made of a steel ball or a ceramic ball, this problem will be solved. Since most of the valve seats and discs of globe valves are easier to repair or replace, and there is no need to disassemble the entire valve from the pipeline when repairing or replacing the sealing element, this is very suitable when the valve and the pipeline are welded together.
Because the flow direction of the medium through this type of valve changes, the minimum flow resistance of the globe valve is also higher than that of most other types of valves. However, this situation can be improved according to the structure of the valve body and the layout of the valve stem relative to the inlet and outlet channels. Simultaneously. Since the stroke between the opening and closing of the globe valve is small, and the sealing surface can withstand multiple openings and closings, it is very suitable for occasions that require frequent switching.
The use of globe valves is extremely common, but due to the large opening and closing torques and the long structure length, the nominal diameter is usually limited to 250mm or less, and there are some up to 400mm. However, special attention should be paid to the inlet and outlet directions when selecting.
Generally, for globe valves with a diameter of less than 150mm, a large amount of medium flows in from below the valve disc. The medium of the globe valve with a diameter of more than 200mm mostly flows in from above the valve disc. The specific situation needs specific analysis and research and development.
Post time: Jul-28-2021