Abstract: A regulator for hydrogen or other media can include a regulator body and an inlet into the regulator body. A first regulator stage can be downstream of the inlet and a second regulator stage can be downstream of the first regulator stage. An interstage passage can extend between the first and second regulator stages and an outlet from the regulator body can be downstream of the second regulator stage. The first regulator stage can include a first valve seat, a first valve stem, and a first sensor configured to transmit pressure force to urge the valve stem toward the valve seat. The second regulator stage can include a second valve seat, a second valve stem, and a second sensor configured to transmit pressure force to urge the second valve stem toward the second valve seat.

Abstract: The valve includes a dome shaped diaphragm clamped between a base and valve body with the base having an inlet and an outlet opening to the diaphragm and a plastic button having a concave central portion surrounded by an annular convex portion for abutting against the diaphragm to move it to a closed position against a valve seat to block fluid flow between the inlet and an outlet. In a valve open position, the button central portion abuts against the diaphragm central portion while, as the button moves to a valve closed position, the closing force is applied to the diaphragm further radial outwardly. An actuator is operable for moving a plunger against a larger diameter insert mounted in a button recess which is axially opposite the diaphragm.