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| Analysis of compressed air system valve selection considerations |
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Such valves shall be lug or international standard IPS pipe tubular port body, and in accordance with U.S. valve and pipe fittings Manufacturers Standardization Society MSS-SP67 standards of manufacture; Path DN50 ~ DN300 rated working pressure is 200psi non-shock cold water , DN350 above 150psi. For insulating the body with 2 inch longer diameter, cast iron or ductile iron. Disc material is aluminum bronze alloy valve seat and Buna-N seals; or Buna-N disc coated with polymer coated body. Stem shall be 400 series stainless steel, not have exposed stem to disc fasteners. DN65 to DN150 diameter should be configured with 10 operating handle position throttling plate; diameter DN200 above shall have gear operators. Lug butterfly valve and slotted structure should be used as isolation valves, and the need for downstream flanges at full pressure without the pipeline terminal. Handle operation of the valve should be applied to lock in the open or closed position.
ACCEPTABLE VALVES:
Lug body, plated ductile iron disc NIBCO LD3110-3 valve (lever operator); LD3110-5 Butterfly (gear operator)
Lug body, aluminum bronze disc NIBCO LD2100-3 valve (lever operator); LD2100-5 Butterfly (gear operator)
Tubular body, rubber coated disc NIBCO GD4775-3 valve (lever operator); GD4775-5 Butterfly (gear operator)
Check: (Note: If the air compressor is reciprocating type, the valve should be located downstream of receiving slot.
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