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Sanfitec Brass Industry Co.,Ltd.
Sanfitec Brass Industry Co.,Ltd.

Function and Application Field of Brass Globe Valve

Brass is also called copper zinc alloy. The most commonly known is cartridge brass, that is, the ratio of 30% zinc and 70% pure copper. It is widely used because of its good mechanical properties and processability. Brass stop valves are widely used in marine valves. It has the advantages that ordinary stop valve does not have.


1. Introduction of brass stop valve


Stop valve refers to the valve whose closing part (disc) moves along the center line of the valve seat. According to this movement form of the disc, the change of the valve seat opening is in direct proportion to the disc stroke. Because the opening or closing stroke of the valve stem of this kind of valve is relatively short and has a very reliable cut-off function, and also the change of the valve seat opening is directly proportional to the stroke of the valve disc, it is very suitable for the regulation of flow. Therefore, this type of valve is very suitable for cut-off or regulation and throttling.


2. Function of brass stop valve


Once the disc of the brass stop valve is removed from the closed position, there is no contact between its seat and the sealing surface of the disc. Therefore, the mechanical wear of its sealing surface is very small, so its sealing performance is very good. However, if the valve disc is made into steel ball or porcelain ball, this problem will be solved. Because the valve seat and disc of most stop valves are relatively easy to repair or replace, and there is no need to disassemble the whole valve from the pipeline when repairing or replacing sealing elements, it is very applicable when the valve and pipeline are welded into one.


Because the flow direction of medium passing through such valves has changed, the minimum flow resistance of stop valves is also higher than that of most other types of valves. However, this condition 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. At the same time, because the stroke between the opening and closing of the stop valve disc is small, and the sealing surface can withstand multiple opening and closing, it is very suitable for occasions requiring frequent opening and closing.


3. Application field of stop valve


Stop valves can be used in most media process systems. Various forms of brass stop valves have been developed to meet various uses in petrochemical, electric power, metallurgy, urban construction, chemical and other departments.


The use of stop valves is very common. However, due to the large opening and closing torque and long structural length, the nominal diameter is usually limited to less than 250mm, and some to 400mm, but special attention should be paid to the inlet and outlet direction when selecting. Generally, most of the stop valve media below 150mm flows from below the valve disc, while most of the stop valve media above 200mm flows from above the valve disc. This is due to the closing torque of the valve. In order to reduce the opening or closing torque, brass stop valves above 200mm are generally equipped with internal bypass or external bypass valves.