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Installation and Maintenance Best Practices for Loose Flange Connections

Installation and Maintenance Best Practices for Loose Flange Connections

Apr 09,2024

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Overview of High-Pressure Gate Valve and Installation and Maintenance Issues

1. The overview of the high-pressure gate valve

Because a high-pressure gate valve is a forced-sealing type valve, when the valve is closed, the valve flap pressure must be provided to push the sealing surface high tight and not leak. Begin the medium by the valve flap below the opening into the valve, manipulation of the strength required to overcome the resistance, is the stem and packing friction, and by the medium of operation pressure generated by the original level of thrust, the force when the valve is closed is much greater than the strength of the open valve, so the high pressure gate valve stem diameter must be large, otherwise the internal failure of the stem directly top bend will occur.

Since the development of self-sealing valves in recent years, the media flow of the globe valve has been changed from the valve flap above the opening into the valve cavity, this time in the media under the action of working pressure. Always remember to close the work when the valve force is small, and open the valve when the force is large, the diameter of the valve stem can be avoided correspondingly reduced. At the same time, this type of valve is more firmly controlled by the medium. The top-down flow direction is used by all shut-off valves.

2. When installing and maintaining a high-pressure gate valve, the following considerations should be made

(1) Handwheel, handle-operated high-pressure gate valve may be put in any position of the pipeline.

(2) Operation of the handwheel, handle, and linkage is not permitted for lifting.

(3) The medium delivered by the pipeline shall have the same flow direction as the arrow on the valve body.

According to the configuration of the sealing surface, gate valves can be divided into wedge gate valve and parallel gate valve. Wedge gate valve (high pressure grade) can be divided into single gate pole type, double gate series, and resilient gate series; parallel gate valve can be divided into single gate type and double gate type. It may be separated into two types of high quality open stem gate valve and concealed stem gate valve based on the thread position of the valve stem.

MSTN International Technologies Company, a reputable gate valve supplier in China, specializes in bolted bonnet, wedge gate valve, and pressure seal bonnet gate valves, which are extensively utilized in the natural gas, petrochemical, oil, maritime, power station, and refinery sectors, industries such as power plants and refineries. An industrial gate valve's gate is utilized to open and close the valve. It travels in a path perpendicular to the flow of the fluid. Flow control is not possible with gate valves since they can only be completely opened and closed. As a result, when the valve is fully open, the flow channel is straight through, with minimum pressure loss. As a result, the gate valve has a wide range of applications.

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