Patent ID: 7481241

Claim:
An apparatus for regulating fluid pressure, comprising: a body having a cavity, an inlet, an exit, and an outlet bore, the inlet and the exit having sealable fluid communication with the cavity; an insert having an insert bore therethrough, the insert positioned in the cavity thereby forming a piston portion and a seal carrier portion of the cavity; a seal carrier having a seal end, a piston contact end, a side bore, and an end bore, the end bore open at the piston contact end and partially penetrating the seal carrier, the side bore in fluid communication with the end bore, the seal carrier slidably positioned in the seal carrier portion, the seal carrier being moveable between a seal carrier open position and a seal carrier closed position, wherein while the seal carrier is positioned in the seal carrier closed position the seal end contacts and seals the inlet to stop a flow of fluid into the cavity; a piston having a stem and a piston passage open at both ends, the piston slidably mounted in the piston portion, the stem slidably mounted in the insert bore, the piston biased in a piston open position and moveable to a piston closed position in response to increased fluid pressure on the piston, wherein while in the piston closed position the stem contacts the piston contact end without sealing the passage and urges the seal carrier into the seal carrier closed position, while in the piston open position the seal carrier slidably moves, independent of the piston, into the seal carrier open position whereby the seal end releases contact with the inlet and permits the flow of fluid into the cavity, and the piston is separate from the seal carrier; a poppet slidably mounted in the outlet bore, the poppet biased in a poppet closed position and moveable to a poppet open position, wherein while the poppet is positioned in the poppet closed position the poppet seals the exit, the outlet bore guides a movement of the poppet, the poppet moves independent of guidance and contact from the piston; and a poppet bypass bore, wherein while in the poppet open position the exit is in fluid communication with the outlet and the poppet bypass bore.