Combination pressure regulator/drain check valve

A combined pressure regulator drain check valve comprising:

• a housing having a main body with an inlet at one end thereof, and a cap secured to an opposite end thereof, said cap having an outlet, an axial flowpath extending between said inlet and said outlet;
• a pressure regulator seat secured within said main body adjacent said inlet;
• a drain check seat formed integrally with the cap adjacent said outlet;
• a tubular plunger located within said main body movable toward and away from the pressure regulator seat and the drain check seat;
• said plunger having a lower open end defined by a cylindrical edge in alignment with said pressure regulator seat;
• said plunger having an open upper end which supports a drain check valve including a resilient seal adapted to engage said drain check valve seat;
• said plunger axially aligned with said inlet and outlet to establish a portion of said axial flowpath;
• said drain check valve connected to an outer annular ring by a plurality of radial webs which permit flow around the drain check valve into the outlet when the valve is open;
• said outer annular ring fixed to an outer peripheral wall of said plunger for movement therewith;
• a diaphragm extending radially between said plunger and said main body, with one side of a radial flange on said plunger providing support for a radially inner portion of said diaphragm;
• and
• a spring having one end engaging an opposite side of said radial flange, and an opposite end engaging the main body at a location proximate to said pressure regulator seat, said spring normally biasing said plunger and said drain check valve in a direction toward said drain check seat.