Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic) Northman Hydraulic Co.,Ltd Agent (ZHANGFA Hydraulic)

What is the working principle and use method of globe valve

What is the working principle and use method of globe valve

The globe valve opening and closing part is a plug shaped disc, the globe valve sealing surface is flat or conical, and the disc moves in a straight line along the center line of the fluid. The globe valve stem movement form, has the lifting rod type, also has the lifting rotary rod type. Globe valve is only suitable for full opening and full closing. It can also be adjusted and throttled.
 
Enter the standard valve globe valve belongs to the forced sealing valve, when the valve closes, must apply pressure to the valve disc, in order to force the sealing surface not to leak. When the medium enters the valve body, the resistance to be overcome by the operating force is the friction force of the globe valve stem and packing and the thrust generated by the pressure of the medium. The force of closing the valve is larger than that of opening the valve, so the diameter of the valve stem is larger, otherwise the fault of the globe valve stem top bending will occur. In recent years, after the appearance of self-sealing valve door, the medium flow direction of globe valve is changed to enter the valve cavity from above the disc. At this time, under the action of medium pressure, the force of closing globe valve is small, while the force of opening globe valve is large, and the diameter of globe valve stem can be correspondingly reduced. At the same time, under the medium action, this form of globe valve is also more strict.
 
Functions and advantages of globe valve:
 
The globe valve is simple in structure and convenient in manufacture and maintenance. Working travel is small, opening and closing time is short. Good sealing, small friction between sealing surface, long life. The disadvantages of globe valves are as follows:
 
The fluid resistance is high, the opening and closing force is large. Not suitable for medium with granule, high viscosity and easy coking. Poor adjustment performance.
 
Globe valve stem thread position can be divided into external thread type, internal thread type. According to the flow direction of the working medium, there are direct flow, direct flow and Angle. Globe valve is divided by the sealing form, with packing sealing globe valve and bellows sealing globe valve.
 
The following points should be paid attention to when the globe valve is installed and maintained:
 
Globe valve operated by hand wheel and handle can be installed in any position of pipeline. Handwheel, handle and moving mechanism are not allowed to be used for lifting. The flow direction of the medium should be the same as the arrow direction indicated by the valve body.
 
When the globe valve opens and the opening height of the disc is 25% ~ 30% of the nominal diameter, the flow has reached the maximum, indicating that the globe valve has reached the full open position. Therefore, the full open position of globe valve should be determined by the stroke of globe valve disc.

The above: Introduction to proportional valve

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