Globe Valves Usage, Advantages, Disadvatages

Uasges of globe valves: 

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The globe valve is different from the ball valve, it is a valve used to adjust the flow in the pipeline, consisting of a movable plug or disc element and a stationary ring seat in a generally spherical body.

Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. 

Since the opening or closing stroke of the valve stem of this globe valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat port is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for use as a cut-off or adjustment and throttling for fluid control.

Once the valve disc of the shut-off valve is removed from the closed position, there is no more 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.

Since 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 shut-off valve is small, and the sealing surface can withstand multiple opening and closing, it is very suitable for occasions that require frequent switching.

The globe valve can be used in most media flow systems, especially used for corrosive or high viscous fluids which solidify at room temperature. Various types of globe valves have been developed to meet various applications in petrochemical, electric power, metallurgy, urban construction, chemical and other sectors.

The use of globe valves is extremely common, but due to the large opening and closing torque and the long structure length, the nominal diameter is usually limited to 250mm or less, and some are up to 400mm. However, special attention should be paid to the inlet and outlet directions when selecting. Generally, the globe valve medium below 150mm mostly flows in it from the below of the valve disc , while the globe valve medium above 200mm mostly flows in from above the valve disc. This is due to consideration of the closing torque of the valve. In order to reduce the opening or closing torque, the stop valve above 200mm is generally equipped with internal bypass or external bypass valve.

The globe valve has the following advantages:

• The globe valve has a simple structure and is more convenient to manufacture and maintain.

• The stop valve has a small working stroke and short opening and closing time.

• The stop valve has good sealing performance, small friction between the sealing surfaces, and long life.

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The disadvantages of the globe valve are as follows:

• The shut-off valve has high fluid resistance and large force required for opening and closing.

• The stop valve is not suitable for the medium with particles, high viscosity and easy to coke.

• The shut-off valve has poor regulation performance.

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Advantages and Disadvantages of Globe Valves

Globe valve refers to the valve that the plate moves along the center line of the valve seat. According to this form of the valve movement, the change of seat opening is proportional to the valve stroke. Because the opening or closing stroke of the stem is relatively short, and has a very reliable cutting function, it is very suitable for flow regulation. Globe valve can be divided into external thread type and internal thread type according to the thread. Globe valve can also be divided into straight type and angle type with the flow direction. Globe valve can also be divided into straight-flow type and angle type with the flow direction. Globe valve can be divided into packing sealing type and bellow sealing type according to the sealing form.

Advantages:

1. Simple structure, convenient manufacture and easy to maintenance

2. Small working stroke, short opening and closing time.

3. Good sealing, low friction between the sealing surfaces and long service life.

Disadvantages:

1. Big flow-resistance and large opening and closing power

2. It is not suitable for the medium with particle, viscosity and easy-coking.

3. Poor regulation performance