Brass globe valve is a stop valve products. Its main material is brass. Brass, also known as copper and zinc alloy, the most commonly known is the March 7 brass, which is the ratio of zinc and copper. Because of its good mechanical properties and processability is widely consumed. Brass globe valves are widely used on marine valves. With the ordinary valve does not have the advantages. Shut-off valve is the closure of the valve (valve) moves along the valve seat center line. 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 flaps 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. At the same time as the closing flap between the opening and closing stroke is small, the sealing surface can withstand multiple opening and closing, so it is 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. The most obvious advantages of the globe valve are: (1) wear resistance due to the friction between the valve disc and the sealing face of the valve body during opening and closing (2) the opening height is generally only the valve seat channel diameter L / 4, so much smaller than the gate valve. (3) Usually there is only one sealing surface on the valve body and the valve flap, so the manufacturing technology is relatively good and easy to maintain. However, the shortcomings of the globe valve can not be ignored. The main drawback is the large flow resistance coefficient, resulting in pressure loss, especially in hydraulic devices, this pressure loss is particularly evident. More keyword search: Globe valve
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