Refrigeration pressure regulator

Claim 1

IN A PRESSURE REGULATING VALVE FOR MAINTAINING A PREDETERMINED REFRIGERANT PRESSURE AT ITS INLET COMPRISING: A HOUSING HAVING A PARTITION WALL DIVIDING IT INTO AN INLET CHAMBER AND AN OUTLET CHAMBER WITH AXIALLY ALIGNED INLET AND OUTLET PORTS, SAID PARTITION HAVING AN APERTURE THERETHROUGH INTERCONNECTING THE CHAMBERS, A VALVE SEAT MEMBER MOUNTED IN SEALED RELATIONSHIP IN SAID APERTURE AND HAVING AN OPENING EXTENDING INTO THE OUTLET CHAMBER FROM A VALVE SEAT LOCATED AT THE INLET END THEREOF, A VALVE PLUG HAVING AN END PORTION RECIPROCABLY GUIDED IN SAID OPENING AND HAVING A RADIAL LAND ENGAGING SAID VALVE SEAT, A VALVE STEM CARRIED BY SAID VALVE PLUG FOR MOVING SAME TO OPEN POSITION, A DIAPHRAGM SECURED CENTRALLY TO SAID VALVE STEM AND MARGINALLY TO THE HOUSING TO DEFINE A SEALED PRESSURE CHAMBER, A GUIDE CARRIED BY SAID HOUSING TO RECIPROCABLY SUPPORT SAID VALVE STEM IN GUIDED RELATIONSHIP, A BLEED PASSAGE INTERCONNECTING THE SEALED PRESSURE CHAMBER AND OUTLET CHAMBER TO EQUALIZE PRESSURES ON OPPOSITE SIDES OF THE DIAPHRAGM WHEN THE VALVE PLUG IS CLOSED, PRESSURE RESPONSIVE PILOT VALVE MEANS FOR ADMITTING PRESSURE IN THE INLET CHAMBER TO SAID SEALED CHAMBER WHEN SAME EXCEEDS A PREDETERMINED PRESSURE, AND CONDUIT MEANS CONNECTING SAID INLET CHAMBER WITH THE PRESSURE CHAMBER AND INCLUDING A PILOT VALVE FOR CONTROLLING THE FLOW OF REFRIGERANT TO THE PRESSURE CHAMBER WHEN THE PRESSURE IN THE INLET EXCEEDS A PREDETERMINED LEVEL TO EFFECT MOVEMENT OF THE DIAPHRAGM AND OPEN THE VALVE PLUG TO THE FLOW OF REGRIGERANT THROUGH THE VALVE PORT TO THE OUTLET CHAMBER, AND AN ELONGATED PICK-UP TUBE HAVING ONE END THEREOF DISPOSED AT THE CENTERMOST POINT OF THE INLET OPENING TO RECEIVE REFRIGERANT FROM THE CENTER OF SAID INLET OPENING FREE OF DIRT AND OIL.