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Globe Valve Manufacturing And Maintenance More Convenient
Jul 04, 2017

The opening and closing of the Globe Valve is a plug-shaped disc, the sealing surface was flat or cone, the valve flap along the center line of the fluid for linear motion. The movement of the stem, there are lift rod (stem lift, hand wheel does not lift), there are lifting and rotating rod (hand wheel and stem together with the lift, the nut is located on the valve body). The globe valve is only suitable for full and full clearance and is not allowed to be adjusted and throttled.

The Globe Valve is a forced seal valve, so when the valve is closed, pressure must be applied to the valve to force the sealing surface from leakage. When the medium from the bottom of the valve into the valve six, the operating force to overcome the resistance is the stem and packing friction and pressure generated by the medium thrust, off the valve force than the valve, so the valve Rod diameter to be large, otherwise there will be stem stem bending failure. In recent years, from the self-sealing valve appears, the valve flow of the valve will be changed from the top of the valve into the valve chamber, then under the action of the medium pressure, the valve is small, and open the valve force, The diameter can be reduced accordingly. At the same time, in the role of the media, this form of the valve is also more tight. China's valve "three to" has been provided, the flow of the valve, all from top to bottom.

When the valve is opened, the opening height of the valve is 25% ~ 30% of the nominal diameter, the flow has reached the maximum, indicating that the valve has reached the full position. So the full stop position of the cut-off valve should be determined by the stroke of the valve.

The cut-off valve has the following advantages:

Simple structure, manufacturing and maintenance more convenient.

Work trip is small, short opening and closing time.

Good sealing, sealing surface friction between the small, long life.

The shortcomings of the cut-off valve are as follows:

Fluid resistance, open and close when the greater demand.

Does not apply to the particles with a larger viscosity, easy to coke medium.

Poor regulation.

The type of the valve according to the position of the stem thread is divided into external thread type, internal thread type. According to the flow of the media points, straight, DC and angle. Cut valve in the form of sealing points, there are packing seal valve and bellows sealing valve.

The installation and maintenance of the Globe Valve should note the following:

Handwheel, handle operated shut-off valve can be installed in any position on the pipe.

Handwheel, handle and motto, do not allow lifting.

The flow of the media should be consistent with the direction of the arrow shown in the valve body.

Cut-off valve, also known as cut-off door, is the most widely used a valve, it is popular, because the opening and closing process between the sealing surface friction is small, more durable, open height is not large, easy to manufacture Convenient, not only for medium and low pressure, but also for high pressure. Its closed principle is to rely on the pressure of the valve, so that the valve sealing surface and the valve seat sealing surface close to prevent the media circulation.

Only one-way flow of the valve, the installation of directional. Its structure length is greater than the gate valve, while the fluid resistance, long-term operation, the sealing reliability is not strong.

Cut-off valves are divided into three categories: straight-through, right angle and DC oblique cut valves.

Shut-off valve

The opening and closing of the Globe Valve is a plug-shaped disc, the sealing surface was flat or cone, the valve flap along the center line of the fluid for linear motion. The movement of the stem, there are lift rod (stem lift, hand wheel does not lift), there are lifting and rotating rod (hand wheel and stem together with the lift, the nut is located on the valve body). The globe valve is only suitable for full and full clearance and is not allowed to be adjusted and throttled.

The Globe Valve is a forced seal valve, so when the valve is closed, pressure must be applied to the valve to force the sealing surface from leakage. When the medium from the bottom of the valve into the valve six, the operating force to overcome the resistance is the stem and packing friction and pressure generated by the medium thrust, off the valve force than the valve, so the valve Rod diameter to be large, otherwise there will be stem stem bending failure. In recent years, from the self-sealing valve appears, the valve flow of the valve will be changed from the top of the valve into the valve chamber, then under the action of the medium pressure, the valve is small, and open the valve force, The diameter can be reduced accordingly. At the same time, in the role of the media, this form of the valve is also more tight. China's valve "three to" has been provided, the flow of the valve, all from top to bottom.

When the valve is opened, the opening height of the valve is 25% ~ 30% of the nominal diameter, the flow has reached the maximum, indicating that the valve has reached the full position. So the full stop position of the cut-off valve should be determined by the stroke of the valve.

The cut-off valve has the following advantages:

1, simple structure, manufacturing and maintenance more convenient.

2, the work of small travel, opening and closing time is short.

3, good sealing, sealing surface friction between the small, long life.

The shortcomings of the cut-off valve are as follows:

1, the fluid resistance, open and close when the greater demand.

2, does not apply to the particles, the viscosity of large, easy coking media.

3, poor regulation performance.

The type of the valve according to the position of the stem thread is divided into external thread type, internal thread type. According to the flow of the media points, straight, DC and angle. Cut valve in the form of sealing points, there are packing seal valve and bellows sealing valve.





Yuhuan Sinpo Valve Co.,LtdTel: +86-576-89903137