Pressure regulator with correlated relief valve

Claim 1

A PRESSURE REGULATOR FOR A CONTROL SYSTEM FOR A HYDRAULICALLY OPERATED VALVE, SAID REGULATOR COMPRISING: A HOUSING FORMED OF TWO GENERALLY CYLINDRICAL SECTIONS WHICH ARE ADJUSTABLY SECURED TO EACH OTHER BY MEANS OF MATING THREADS; THE FIRST SECTION HAVING AN INLET PORT WHICH IS IN COMMUNICATION BY A PASSAGE WITH A CYLINDRICAL CHAMBER IN WHICH IS POSITIONED A PISTON, A PROPET REGULATOR VALVE IN THE PASSAGE BETWEEN THE INLET PORT AND THE CYLINDRICAL CHAMBER, A POPPET RELIEF VALVE IN THE PISTON, THE RELIEF VALVE HAVING A PORTION NORMALLY CONTACTING AND HOLDING OPEN THE REGULATOR VALVE, AN OUTLET PORT IN COMMUNICATION WITH THE CYLINDRICAL CHAMBER; THE SECOND SECTION HAVING A SPRING WHICH BEARS AGAINS THE PISTON AND A CENTRAL MEMBER WHICH CONTACTS THE RELIEF VALVE IN THE PISTON, THE CENTRAL MEMBER HAVING A DISCHARGE PASSAGE, THE MAGNITUDE OF SPRING BEING ADJUSTABLE BY POSITIONING OF THE TWO SECTIONS RELATIVE TO EACH OTHER WHEREBY THE REGULATOR VALVE REMAINS OPEN UNTIL THE PRESSURE IN THE CYLINDRICAL SECTION OVERCOMES THE MAGNITUDE OF THE SPRING AT WHICH TIME THE RELIEF VALVE MOVES OUT OF CONTACT WITH THE REGULATOR VALVE CLOSING THE REGULATOR VALVE; UPON ANY FURTHER INCRESE IN PRESSUR IN THE CYLINDRICAL CHAMBER THE PISTON MOVES FURTHER INTO THE CHAMBER AND THE RELIEF VALVE CONTACTS THE CENTAL MEMBER AND RELIEVES EXCESS PRESSURE THROUGH THE DISCHARGE PASSAGE IN THE CENTRAL MEMBER.