Selection of valves and design of pipes shall comply with the following principals:
In terms of locations and purposes of valves, the suitable valves can be selected after knowing relevant specification, size, standards,principal and permission;
Need to specify the working condition, applicable medium, working pressure and working temperature of media;
Need to specify the nominal diameter to match the pipeline: DN(mm)
Need to specify the connecting type of the pipeline, including flanged type, inside&outside screwed type, welded type, wafer type, clip type, groove type,and union type etc.;
Need to specify the operating type of the valve, including lever, worm gear, pneumatic actuator, hydraulic actuator,
electromagnetic actuator and electromagnetic-hydraulic actuator etc.;
Need to specify the working type of valve, including on-off type, adjusting type, safety type etc.;
Need to specify material of body and trim, including grey iron, ductile iron, carbon steel, alloy steel, stainless steel, monel alloy,copper alloy, aluminum alloy, plastic etc.;
Need to specify the requirements on seal performance and grade or leakage;
Need to specify the requirements on coating, packing and transportation;
Need to specify face to face dimension, height, outline sizes, flow resistance, drainage ability, flow characteristic, protected grade, anti-explosive performances etc. for special valves;
Need to specify the installed position and direction for the valve.
