Selection of valves is done on the following basis:
What to handle, liquid, gas or powder, fluid nature, function, construction material, disc type, stem type, how to operate, bonnet type, body ends, delivery time, cost, warranty.
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Selection of Valves
Re: Selection of Valves
What are functions of valves?
Isolation, regulation, non-return and special purposes.
What are isolating valves?
Gate, ball, plug, piston, diaphragm, butterfly, pinch.
What are regulation valves?
Globe, needle, butterfly, diaphragm, piston, pinch.
What are non-return valves?
Check valve.
What are special valves?
Multi-port, flush bottom, float, foot, pressure relief, breather.
What materials are used for construction of valves?
Cast iron, bronze, gun metal, carbon steel, stainless steel,alloy carbon steel, polypropylene and other plastics, special alloys.
What is trim?
Trim is composed of stem, seat surfaces, back seat bushingand other small internal parts that normally contact the surface fluid.
Which standard specifies trim numbers for valve?
API 600.
What are wetted parts of valve?
All parts that come in contact with surface fluid are called wetted parts.
What is wire drawing?
This term is used to indicate the premature erosion of the valve seat caused by excessive velocity between seat & seat disc, when valve is not closed tightly.
Isolation, regulation, non-return and special purposes.
What are isolating valves?
Gate, ball, plug, piston, diaphragm, butterfly, pinch.
What are regulation valves?
Globe, needle, butterfly, diaphragm, piston, pinch.
What are non-return valves?
Check valve.
What are special valves?
Multi-port, flush bottom, float, foot, pressure relief, breather.
What materials are used for construction of valves?
Cast iron, bronze, gun metal, carbon steel, stainless steel,alloy carbon steel, polypropylene and other plastics, special alloys.
What is trim?
Trim is composed of stem, seat surfaces, back seat bushingand other small internal parts that normally contact the surface fluid.
Which standard specifies trim numbers for valve?
API 600.
What are wetted parts of valve?
All parts that come in contact with surface fluid are called wetted parts.
What is wire drawing?
This term is used to indicate the premature erosion of the valve seat caused by excessive velocity between seat & seat disc, when valve is not closed tightly.