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US 4,303,372 AGranted
Bleed valve particularly for a multi-stage compressor
AssigneeDavey Compressor Company
InventorTerence Caffrey
Life of this patent
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AssigneeDavey Compressor Company
InventorTerence Caffrey
Estimating the term…
A multi-stage compressor has a trap between adjacent stages to collect moisture from the compressed air passing from the exit of one compression stage to the entrance of the next compression stage. Each of the traps communicates with the next of the preceding traps through a bleed valve whereby moisture passes from one trap to another without having any effect on the substantial pressure differential between the two traps. The bleed valve has a diaphragm within a housing to divide the housing into first and second chambers with the first chamber communicating with the high pressure side trap and the second chamber communicating with the low pressure side trap. The flow from the high pressure side trap to the first chamber and the second chamber is controlled so that a predetermined pressure differential of one p.s.i. is maintained across the diaphragm.
A multi-stage compressor for a gas having a plurality of compressor stages, each of said compressor stages increasing the pressure of the gas from the prior stage, non-electrical means disposed between at least one adjacent pair of said stages to remove moisture in the compressed gas from the entrance side of the higher pressure stage of said adjacent stages to an ambient having the pressure of the entrance side of the lower pressure stage of said adjacent stages and at a pressure greater than atmospheric without affecting the pressure differential between the entrance sides of said adjacent stages, and means to prevent the return of the removed moisture to the entrance side of any of said compressor stages having its ambient at a pressure greater than atmospheric.
A multi-stage compressor for a gas having a plurality of compressor stages, each of said compressor stages increasing the pressure of the gas from the prior stage, means disposed between at least one adjacent pair of said stage to remove moisture in the compressed gas from the entrance side of the higher pressure stage of said adjacent stages to an ambient having the pressure of the entrance side of the lower pressure stage of said adjacent stages without affecting the pressure differential between the entrance sides of said adjacent stages, said disposed means including a bleed valve, said bleed valve including a housing having an inlet communicating with the ambient having the pressure of the entrance side of said higher pressure adjacent stage and an outlet communicating with the ambient having the pressure of the entrance side of said lower pressure adjacent stage, said housing having first and second chambers therein, said first chamber communicating with said inlet, said second chamber communicating with said outlet, and control means in said housing to allow flow to said second chamber while maintaining a maximum predetermined pressure differential between said first and second chambers irrespective of the pressure differential between said inlet and said outlet.
A multi-stage compressor for a gas having a plurality of compressor stages, each of said compressor stages increasing the pressure of the gas from the prior stage, means disposed between each adjacent pair of said stages to remove moisture in the compressed gas from the entrance side of the higher pressure stage of said adjacent stages to an ambient having the pressure of the entrance side of the lower pressure stage of said adjacent stages without affecting the pressure differential between the entrance sides of said adjacent stages, each of said disposed means including a bleed valve, said bleed valve including a housing having an inlet communicating with the ambient having the pressure of the entrance side of said higher pressure adjacent stage and an outlet communicating with the ambient having the pressure of the entrance side of said lower pressure adjacent stage, said housing having first and second chambers therein, said first chamber communicating with said inlet, said second chamber communicating with said outlet, and control means in said housing to allow flow to said second chamber while maintaining a maximum predetermined pressure differential between said first and second chambers irrespective of the pressure differential between said inlet and said outlet.
A method of continuously removing moisture in the compressed gas of a multi-stage compressor having a plurality of compressor stages in which each of the compressor stages increases the pressure of the gas from the prior stage including continuously removing moisture in the compressed gas from the entrance side of the higher pressure stage of at least one adjacent pair of the stages to an ambient having the pressure of the entrance side of the lower pressure stage of the adjacent stages and of a pressure greater than atmospheric without affecting the pressure differential between said entrance sides of the adjacent stages and preventing the return of the removed moisture to the entrance side of any of the compressor stages having its ambient at a pressure greater than atmospheric.
Dependencies are inferred from the claim text.