Safety Valve Model Selection

Model	Temperature	Medium	Type
A27H	≤200℃	Water, Air, Steam	Low Lift- closed Bonnet-with lever
A27Y	≤200℃	Corrosive medium	Low Lift- closed Bonnet-with lever
A28H	≤200℃	Air, Steam, Water, Mixture of N₂& H₂	Full Lift- closed Bonnet-with lever
A28Y	≤200℃	Corrosive medium	Full Lift- closed Bonnet-with lever
A41H	≤300℃	Petroleum, Air, Water	Low Lift- closed Bonnet
A41Y	≤200℃	Corrosive medium	Low Lift- closed Bonnet
A47H	≤350℃	Steam, Air	Low Lift-Open Bonnet-with lever
A47Y	≤350℃	Steam, Air	Low Lift-Open Bonnet-with lever
A42Y	≤300℃	Air, Petroleum gas, Liquid	Full Lift-Closed Bonnet
A42Y	≤200℃	Corrosive medium	Full Lift-Closed Bonnet

A48Y	≤350℃	Steam, Air	Full Lift-Open Bonnet-with lever
A44Y	≤300℃	Air, Steam, Petroleum	Full Lift-Closed Bonnet-with lever
A44Y	≤200℃	Corrosive medium	Full Lift-Closed Bonnet-with lever
A37H, A38Y, A43H	≤350℃	Steam, Air	Twin Type
A42Y	≤200℃	Air,, Mixture of N₂& H₂	Full Lift-Closed Bonnet with high pressure.
A42Y	≤200℃	Corrosive medium	Full Lift-Closed Bonnet with high pressure.
A42F	-29～80℃	LPG or similar non-corrosive medium	Full Lift-Closed Bonnet
A40Y Cast Steel Body	≤400℃	Air, Petroleum Gas, Mixture of N₂& H₂	Full Lift-Closed Bonnet with heat radiator
A40Y 1Cr5Mo Body	≤450℃	Air, Petroleum Gas, Mixture of N₂& H₂	Full Lift-Closed Bonnet with heat radiator