Selection principle of globe valve
The shut-off 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 valve disc, the change of the valve seat port is proportional to the valve disc stroke. Since the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat port is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for use as a shut-off or adjustment and throttling.
The shut-off 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 valve disc, the change of the valve seat port is proportional to the valve disc stroke. Since the opening or closing stroke of the valve stem of this type of valve is relatively short, and it has a very reliable cut-off function, and because the change of the valve seat port is in direct proportion to the stroke of the valve disc, it is very suitable for flow adjustment. Therefore, this type of valve is very suitable for use as a shut-off or adjustment and throttling.
The selection principle of the globe valve is:
1. The stop 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 and high-pressure pipelines of petrochemical systems.
2. On pipelines that do not require strict convection resistance. That is, where the pressure loss is not considered.
3. For small valves, needle valves, instrument valves, sampling valves, pressure gauge valves, etc. can be used.
4. There are flow adjustment or pressure adjustment, but the adjustment accuracy is not high, and the pipe diameter is relatively small, such as the pipe with a nominal passage of ≤50mm, it should be selected.
5. Small fertilizers and large fertilizers in synthetic industrial production should use high pressure angle globe valves or high pressure angle globe valves with a nominal pressure of PN160 and a nominal pressure of 16MPa or PN320 and a nominal pressure of 32MPa.
6. In the desiliconization workshop of the alumina Bayer process and the pipelines that are prone to coking, it is easy to choose the direct-flow stop valve or direct-flow stop valve with the valve body separated, the valve seat can be removed, and the cemented carbide sealing pair.
7. For water supply and heating projects in urban construction, smaller pipelines are nominally passed through, and stop valves, balance valves or plunger valves can be selected, such as pipelines with nominally passed through less than 150mm.
Nortech is one of the leading industrial valve manufacturers in China with quality certification ISO9001.
Major products: Butterfly Valve, Ball Valve,Gate Valve, Check Valve, Globe Vavlve,Y-Strainers, Electric Acurator , Pneumatic Acurators .
Post time: Sep-22-2021