Temperature compensated compressor bleed control mechanism

Claim 1

BLEED CONTROL APPARATUS FOR A COMPRESSOR OF THE TYPE HAVING A BLEED PASSAGE LEADING FROM A SELECTED STAGE OF THE COMPRESSOR AND A BLEED VALVE IN THE BLEED PASSAGE, SAID CONTROL APPARATUS COMPRISING: FIRST FLUID PRESSURE RESPONSIVE MEANS ADAPTED TO BE OPERATIVELY CONNECTED WITH THE BLEED VALVE FOR OPENING AND CLOSING THE BLEED VALVE; A PASSAGE FOR SUPPLYING FLUID PRESSURE TO SAID FIRST FLUID PRESSURE RESPONSIVE MEANS; SECOND FLUID PRESSURE RESPONSIVE MEANS FOR CONTROLLING THE FLOW OF FLUID PRESSURE THROUGH SAID PASSAGE TO SAID FIRST FLUID PRESSURE RESPONSIVE MEANS; PILOT CONTROL MEANS FOR CONTROLLING THE FLOW OF FLUID PRESSURE TO SAID SECOND FLUID PRESSURE RESPONSIVE MEANS SAID PILOT CONTROL MEANS INCLUDING A FIRST PASSAGE AND A SECOND PASSAGE BOTH OF WHICH ARE CONNECTED AT ONE OF THEIR ENDS WITH A SOURCE OF FLUID PRESSURE AND AT THE OTHER OF THEIR ENDS WITH SAID SECOND FLUID PRESSURE RESPONSIVE MEANS, AN OUTLET FOR EACH OF SAID PASSAGES INTERMEDIATE THE ENDS THEREOF, PILOT VALVE MEANS MOVABLE FROM ONE POSITION WHEREIN BOTH OF SAID OUTLETS ARE OPEN TO A SECOND POSITION WHEREIN FLUID PRESSURE IS CAUSED TO FLOW THROUGH SAID FIRST PASSAGE TO SAID SECOND FLUID PRESSURE RESPONSIVE MEANS, AND TO A THIRD POSITION WHEREIN BOTH OF SAID OUTLETS ARE CLOSED, AND SENSOR MEANS ADAPTED TO BE CONNECTED WITH SELECTED STAGES OF THE COMPRESSOR FOR SENSING THE RATIO OF PRESSURES THEREIN AND OPERATIVELY CONNECTED WITH SAID PILOT VALVE MEANS FOR MOVING SAID PILOT VALVE MEANS TO ANY ONE OF SAID THREE POSITIONS IN RESPONSE TO VARIATIONS OF THE RATIO; AND RESET MEANS IN COMMUNICATION WITH SAID SECOND PASSAGE FOR CONTROLLING THE EXHAUSTING OF FLUID PRESSURE THROUGH SAID SECOND PASSAGE FROM SAID SECOND FLUID PRESSURE RESPONSIVE MEANS INCLUDING A FLUID PRESSURE RESPONSIVE ELEMENT ACTUATED BY FLUID PRESSURE IN SAID SECOND PASSAGE AND A VALVE ACTUATED BY SAID ELEMENT, SAID VALVE OPENING SAID SECOND FLUID PRESSURE RESPONSIVE MEANS DIRECTLY TO THE OUTLET IN SAID SECOND PASSAGE WHEN SAID PILOT VALVE IS IN THE THIRD POSITION.