The Globe Valve Is One Of The Most Used Of All Valves

The opening and closing part of the 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.

The globe valve belongs to the occlusive valve, which mainly plays the role of cutting off the pipeline. The globe valve is one of the most used valves, and it is also the most suitable valve form for throttling. Because it has good regulating performance and compared with other structural types of valves, the wear distribution caused by erosion is more uniform around the globe valve seat.

The globe valve is a forced sealing valve, so when it is closed, pressure must be applied to the disc so that there is no leakage between the two sealing surfaces. Since the sealing force of the globe valve and the medium pressure are on the same axis, and the direction is opposite, the sealing force will not be amplified, but must overcome the pressure of the medium, so the sealing force required by the globe valve is much larger than that of the gate valve.

Special attention should be paid to the selection of globe valves. Globe valves with flat seals cannot be used for dirty media or media containing solid particles. In these media, it is more appropriate to use a conical sealing surface to seal.

Generally, globe valves are recommended for throttling, regulation, and high-pressure pipeline systems; globe valves can be selected for double-position recommendations, light and small structural requirements, no strict requirements for structural length, low-pressure cut-off (small pressure difference), and high-temperature media. ; In mud, media containing solid particles, wear-resistant, diameter shrinkage, fast action is required, and the operating force is small, try not to use a stop valve; when good sealing performance is required, high-pressure cut-off (large pressure difference), low noise, and effective A stop valve with a special design structure can be used for cavitation and vaporization, a small amount of leakage to the atmosphere, abrasive media, and low temperature and cryogenic conditions.

Another important feature of the stop valve is that the seal of the valve stem can be replaced by bellows to replace the packing seal, forming a bellows stop valve. Bellows globe valves are suitable for flammable, explosive, toxic,  and very pure media, and can also meet the requirements of vacuum systems.

However, the globe valve also has its disadvantages, mainly caused by the internal shape of the valve body. In the body cavity of the globe valve, the medium changes from horizontal linear flow to upward or downward vertical flow, and then to horizontal flow, so pressure loss occurs, especially in hydraulic devices. This pressure loss should be taken seriously.

As one of the most important cut-off valves, the globe valve plays an important role in the aerospace field. As an important component of aerospace equipment, the globe valve realizes the functions of medium transmission, cut-off, adjustment, etc., and its sealing performance directly affects the safe and reliable operation of aerospace equipment. Studying the influencing factors and influencing laws of typical globe valve sealing characteristics has guiding significance for the structural design of the valve sealing pair, so as to improve the sealing performance and reliability of the valve.

Zhejiang Shunlin Valve Co., Ltd. is a China flange valves manufacturer and OEM flange valves supplier, We offer custom flange valves for sale.