The Role Of The Stop Valve In The Pipeline

Jan. 15, 2020

Stainless steel globe valve is a kind of globe valve, which has high requirements for the material of the valve body. Generally, there are several materials such as 301.304.316. They are widely used in chemical, marine, pharmaceutical, food machinery and other industries. Stainless steel globe valve is divided into manual stainless steel globe valve, pneumatic stainless steel globe valve, electric stainless steel globe valve, and also Stainless Steel Thread Globe Valve.

The opening and closing part of the stop valve is a plug-shaped valve disc, the sealing surface is flat or conical, and the valve disc moves linearly along the center line of the fluid. The movement of the valve stem also has a lifting and rotating lever type. The globe valve is only suitable for full opening and full closing, and it is not allowed to adjust and throttle.

The globe valve is a compulsory sealed valve, so when the valve is closed, pressure must be applied to the disc to force the sealing surface to not leak. When the medium enters the valve from below the valve disc, the resistance to be overcome by the operating force is the friction between the valve stem and the packing and the thrust generated by the pressure of the medium. The force to close the valve is greater than the force to open the valve. The diameter must be large, otherwise the valve top bending failure will occur. In recent years, after the emergence of self-sealing valves, the medium flow direction of the shut-off valve has changed from the upper part of the valve disc into the valve cavity. At this time, under the action of the medium pressure, the force to close the valve is small, and the force to open the valve is large. The diameter can be reduced accordingly. At the same time, this type of valve is also tight under the action of the medium. The flow direction of the shut-off valve is always from top to bottom.

Stainless Steel Thread Globe Valve

Stainless Steel Thread Globe Valve

When the shut-off valve is opened, the opening height of the valve flap is 25% ~ 30% of the nominal diameter, and the flow has reached the maximum, indicating that the valve has reached the fully open position. Therefore, the fully open position of the shut-off valve should be determined by the stroke of the disc.

The following Handwheel Forged Steel Gate Valve Manufacturer introduce the matters needing attention in the installation and maintenance of globe valves:

1. Stop valves operated by handwheels and handles can be installed at any position in the pipeline.

2. Handwheel, handle and rotating mechanism are not allowed for lifting.

3. The flow direction of the medium should be consistent with the direction of the arrow shown on the valve body.

4. Regularly check the seal.

The globe valve plays an important role in cutting off and throttling the medium in the pipeline where it is located. As a very important shut-off valve, the globe valve is sealed by applying torque to the valve stem, and the valve stem is in the axial direction. Apply pressure to the valve disc to make the valve disc sealing surface and valve seat sealing surface closely fit to prevent the medium from leaking along the gap between the sealing surfaces.

The sealing pair of the cut-off valve is composed of a valve disc sealing surface and a valve seat sealing surface, and the valve rod drives the valve disc to move vertically along the center line of the valve seat. During the opening and closing process of the shut-off valve, the opening height is small, the flow rate is easy to adjust, and the manufacturing and maintenance are convenient, and the pressure is applicable in a wide range.

Compared with another commonly used shut-off type valve in industrial production, the stop valve is simpler in structure than the former, and is easier to manufacture and maintain. In terms of service life, the sealing surface of the shut-off valve is not easy to wear and abrasion, and there is no relative sliding between the valve disc and the sealing surface during the valve opening and closing process. The service life of the shut-off valve in the fully closed process is small, the height of the valve flap is relatively small. The disadvantage of the globe valve is that the opening and closing torque is large and it is difficult to achieve fast opening and closing. Because the flow passage in the valve body is relatively tortuous, the fluid flow resistance is large, resulting in a large loss of fluid power in the pipeline.

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