What is the principle of selection of the globe valve
A shutoff valve is a valve that closes the member and moves along the centerline of the seat. Generally, according to the movement form of the valve flap, the change of the valve seat opening is proportional to the valve stroke, and since the valve stem opening or closing stroke of the shut-off valve is relatively short and has a very reliable cutting function, Since the change of the valve seat opening is proportional to the stroke of the valve flap, it is very suitable for the adjustment of the flow rate.we are globe valve sellers,we can guarantee quality.
Therefore, the shut-off valve is very suitable for use as a cut-off or adjustment and throttling. The selection principle of the globe valve is:
1.A shut-off valve should be used on the pipeline or device of high temperature and high pressure medium. Such as thermal power plants, nuclear power plants, high-temperature pipelines of petrochemical systems.
2.On the pipeline where the flow resistance is not strict, that is, the place where the pressure loss is not considered. 3. Small valves are available with needle type, instrument valve, sampling valve, pressure gauge valve, etc.
4.There are flow regulation or pressure regulation, but the adjustment accuracy is not high, and the pipeline diameter is relatively small. For example, the pipeline with nominal diameter ≤ 50mm should be used.
5.For small chemical fertilizers and large chemical fertilizers in synthetic industrial production, high-pressure angle shut-off valves or high-pressure angle throttle valves with nominal pressure PN160 nominal pressure 16 MPa or PN320 nominal pressure 32 MPa should be used.
6.In the desiliconization workshop of alumina Bayer production, on the pipeline which is easy to coke, it is easy to choose the valve body to separate, the valve seat can be removed, the DC seal valve or the DC throttle valve of the carbide seal pair.
7.In the water supply and heating projects in urban construction, the pipeline with the smaller nominal diameter can be used as the cut-off, balance valve or plunger valve, such as the nominal diameter, such as the pipe with the nominal diameter less than 150mm, the most obvious advantages Yes: During the opening and closing process, since the friction between the valve disc and the sealing surface of the valve body is smaller than that of the gate valve, the wear resistance is generally only 1/4 of the diameter of the valve seat passage. Therefore, it is much smaller than the gate valve. Usually there is only one sealing surface on the valve body and the valve flap, so the manufacturing process is better and easy to repair.
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