PPR is a random copolymer of propylene and ethylene, and PP-R pipe is formed by extruding PP-R resin through an extruder. .Due to the small friction between the sealing surfaces during the opening and closing process, it is relatively durable, the opening height is not large, the manufacturing is easy, and the maintenance is convenient. It is not only suitable for medium and low pressure, but also for high pressure.
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.
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.
Such as: 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 is 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 type ppr globe valves or high pressure angle type throttle 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 pipeline that is prone to coking, it is easy to choose the direct-flow ppr stop valve or the direct-flow throttle valve with the valve body separated, the valve seat can be removed, and the cemented carbide sealing pair.
7. In the water and heat supply projects in urban construction, the nominally smaller pipelines pass through, and stop and balance valves can be used.
