Globe valve has the following advantages: 1. Globe valve structure is simple, more convenient manufacture and maintenance. 2. Stop valve work trip, opening and closing time is short. 3. Globe valve sealing, sealing surface friction, longer life expectancy. Cut-off valve shortcomings are as follows: 1. Cut-off valve fluid resistance, opening and closing the required force larger. 2. Globe valve does not apply to particles with a larger viscosity, easy to coke media. 3. Globe valve adjustment performance is poor. The type of stop valve by the location of the stem thread male threaded stop valve, threaded stop valve. According to the flow of media points, there are through-type globe valve, DC globe valve and angle valve. Globe valve by sealing form points, there are packing seal globe valve and bellows seal valve. Shut-off valve installation and maintenance should note the following: 1. Handwheel, handle operated shut-off valve can be installed in any position on the pipeline. 2. Handwheel, handle and Wei moving mechanism, do not allow lifting. 3. The flow direction of the medium should be the same as the arrow direction of the valve body. The purpose of the globe valve Globe valve is the closing piece (valve flap) moves along the valve seat centerline. Depending on the type of movement of the valve disc, the change in valve seat opening is in direct proportion to the valve disc stroke. Due to the valve stem of this type of valve opening or closing stroke is relatively short, but also has a very reliable cut-off function, but also because the valve seat opening changes in proportion with the valve stroke is proportional to the flow rate is very suitable for regulation. Therefore, this type of valve is ideally suited for shut-off or regulation as well as throttling. Once the valve disc of the stop valve is removed from the closed position, its valve seat and the valve disc sealing surface are no longer in contact with each other so that the mechanical wear of the sealing surface is very small, so the sealing performance is good, the disadvantage is Sealing surfaces may trap particles in the flowing medium. However, if the valve made of steel ball or ceramic ball, the problem will be solved. Since most shut-off valve seats and discs are relatively easy to repair or replace, and the entire valve does not have to be removed from the line for repair or replacement of seals, this is a good fit where the valve is welded to the line. As the flow of media through the valve changes direction, the minimum flow resistance of the shut-off valve is also higher than most other types of valves. However, depending on the body structure and the arrangement of the stem relative to the inlet and outlet passages, this condition can be improved. Simultaneously. As the closing flap between the opening and closing stroke is small, the sealing surface can withstand multiple opening and closing, it is very suitable for frequent switching applications. Shut-off valves are used in most media flow systems. Has developed to meet the petrochemical, electricity, metallurgy, urban construction, chemical and other sectors of the various forms of the globe valve. The use of stop valves is extremely common, but the larger the opening and closing torques, the longer the length of the structure, usually the nominal diameter is limited to below 250mm, but also to 400mm, but the choice of special attention to import and export direction. Most of the following 15Omm most of the cut-off valve media most of the inflow from the valve below, and more than 2O0mm most of the globe valve medium inflow from the top of the valve. This is due to the closing torque of the valve. In order to reduce the opening or closing torque, generally more than 2O0mm off valve are provided within the bypass or bypass valve.
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