Patent ID: 7836911

Claim:
A regulator comprising: a body having a longitudinal axis and inner walls, the inner walls defining at least engagement walls, piston chamber walls, piston stem guide walls, and a piston stem port; spring means biasing a piston towards engagement walls; a valve and piston assembly, including a piston having a body and piston head, the piston body having a piston stem, the piston stem having a channel therein, the piston head having a crown and having a valved opening and outer walls, the piston body also having an inner volume in fluid communication with the channel and the valved opening, the piston and valve assembly further including a plug, the plug having a plug body dimensioned for receipt substantially within the inner volume of the piston body and a plug arm, the plug arm extending through the valved opening for engagement with the engagement walls of the body, the valve and piston assembly further including a keeper spring for acting between the piston body and the plug to urge the plug towards the valved opening; and; sealing means between the piston head and the inner walls of the body; wherein the crown of the piston head and a portion of the inner walls of the body define a regulated chamber; wherein the piston stem is in sliding engagement with the piston stem guide walls, wherein the area of the valved opening is approximately equal to the area of the piston stem port.