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An air pressure regulator includes a housing having inlet and outlet ports extending along a common axis. A movable valve member and a piston are positioned in the housing on opposite sides of a housing flow passage. The movable valve member is adjacent the inlet port while the piston is adjacent th

An air pressure regulator includes a housing having inlet and outlet ports extending along a common axis. A movable valve member and a piston are positioned in the housing on opposite sides of a housing flow passage. The movable valve member is adjacent the inlet port while the piston is adjacent the outlet port. The piston has a central stem extending through the housing flow passage in radially-spaced relationship thereto for engaging the movable valve member. The piston is normally biased in a direction toward the movable valve member for holding same displaced from a seat around the housing flow passage. When a predetermined pressure exists at the outlet port, the piston moves away from the movable valve member for allowing same to move into engagement with a seat around the housing flow passage for closing such passage.

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A pressure regulator comprising: a housing having inlet and outlet ports along a common axis, a first bore in said housing adjacent said inlet port, a second bore in said housing adjacent said outlet port, said second bore being stepped to define a large diameter second bore portion facing said firs

A pressure regulator comprising: a housing having inlet and outlet ports along a common axis, a first bore in said housing adjacent said inlet port, a second bore in said housing adjacent said outlet port, said second bore being stepped to define a large diameter second bore portion facing said first bore and a small diameter second bore portion facing said oulet port, a central housing passage connecting said bores and having a seat facing said first bore, a movable valve member in said first bore having flow passages therearound for flow of fluid therepast from said inlet port through said housing passage, first biasing means for normally biasing said valve member toward said seat, a stepped piston positioned in said second bore and having a first piston end facing said housing passage and a second piston end facing said outlet port, piston passages through said piston between said first and second piston ends, a stem extending from said first piston end through said housing passage in radially-spaced relationship thereto, second biasing means for normally biasing said piston toward said inlet port for engaging said stem with said valve member and displacing said valve member away from said seat for flow of fluid from said inlet port to said outlet port around said valve member, through said housing passage and through said piston passages, said piston being responsive to a predetermined fluid pressure in said outlet port to move toward said outlet port for engaging said valve member with said seat to block fluid flow from said inlet port through said housing passage, axially-spaced seals between said piston and said large and small diameter second bore portions, a lateral housing exhaust passage in said housing communicating with said second bore between said seals, and a piston exhaust passage extending centrally through said stem and then laterally to open outwardly of said piston between said seals.