| 摘要 |
A set point of a pressure output of a pressure regulator (12) is adjustable without having to overcome a biasing force to selectively adjust the set point of the pressure output. The regulator includes a housing (14) having a chamber (18) and a pressure output port (24) in fluid communication with the chamber (18). A piston (38) having an interior cavity (42) is slidably disposed within the chamber (18) of the housing (14). A biasing member (88) extends between the piston (38) and the housing (14), such that a biasing force is applied to the piston (38) which increases as the piston (38) is moved in a direction away from the pressure output port (24) of the housing (14). The piston (38) has a first flow port (54) which extends through a wall of the piston (38). An operating member (56) has a second flow port (60) which is positionable within the interior cavity (42) of the piston (38) at selected distances from the ends (20, 22) of the housing (14). The second flow port (60) is in fluid communication with a supply pressure. A seal (72) extends into the interior cavity (42), between the operating member (56) and the piston (38). The output pressure pushes against the piston (38) to compress the biasing member (88) to align the first flow port (54) relative to respective ones of the seal (72) and the second flow port (60), according to the value of the pressure output relative to the set point. The selected position of the operating member (56) within the housing (14) determines a positioning of the piston (38) for aligning the first flow port (54) relative to the seal (72) and the second flow port (60).
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