Gas pressure regulator

A pressure regulator having a housing and a cover therefor;

• a flexible diaphragm clampled therebetween and forming a gas pressure chamber and an atmospheric pressure chamber;
• spring means, said diaphragm being responsive, against the force of said spring means, to the gas pressure in said gas pressure chamber;
• stop means for arresting the movement of said diaphragm in response to predetermined excess pressure in the gas pressure chamber;
• means connected to the diaphragm for regulating the flow of gas to said gas pressure chamber and including a flow control valve and actuating means therefor connected to said diaphragm, said actuating means including a lever and a push-pull sliding connection including auxiliary spring means for operatively connecting said diaphragm and said lever, stop means for arresting the movement of said lever in response to excessive pressure in said pressure chamber, said auxiliary spring means yielding in response to excess gas pressure in the pressure chamber on said diaphragm after the lever has been arrested by its said stop means to protect said diaphragm and said lever from damage, said stop means for arresting the movement of the diaphragm comprises a first metal plate carried by the side of the diaphragm in the atmospheric pressure chamber and having peripheral edge portions positioned to engage stationary parts of said cover, a second metal plate engaging the side of the diaphragm in the gas pressure chamber;
• and means connecting said plates together with the diaphragm sandwiched between them comprising a bushing extending through aligned holes in said diaphragm and said plates, said bushing having a flange engaging said second metal plate and a nut engaging the first-named plate and said auxiliary spring means being interposed between said nut on said bushing and a nut on the end of said push-pull sliding connection.