Malleable iron pipe fittings manufacturers to introduce the next how to identify some small knowledge valve
1, applies to keep the valve fully open, fully closed the case, do not use the throttle or adjust.
2, the shut-off valve is suitable for frequent switching of the occasion, with a shut-off valve can be used, does not apply to two-way flow of process piping and piping containing solid particles of the medium.
3, check valves adapted to prevent the media back in the pipeline, the impact of the requirements of small, l low flow resistance. When the medium flow fluctuation range is large, the check valve should be set up buffer means.
4, having a cut-off valve and open function, when opening angle of 15 ° -70 °, the flow rate can be adjusted.
5, having a cut-off valve, open and moderate throttling capabilities for high-viscosity and medium pipe with suspended particles. Arts for conveyor material is extremely hazardous, highly hazardous and flammable media valve piping should be used anti (resistance) fire, anti-static structure.
Threaded bonnet structure shall meet the following requirements:
1, the valve cover should be used for threaded connection nominal diameter less than or equal to the gate and globe valves 50MM.
2, the valve cap male thread should be used for nominal diameter less than or equal to the valve 80MM.
The following conditions are not threaded bonnet connection:
1, may cause stress corrosion and crevice corrosion of pipes.
2, the pressure pulsation and temperature changes frequently pipeline.
3, the degree of contact is extremely harmful medium hazard, high hazard media and liquefied hydrocarbon pipelines.
4, nominal pressure exceeds 1.6MPa steam pipe.
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