Pressure regulating valve

A regulating valve adapted to be interposed between a pressurized fluid supply whose pressure varies and a fluid applicator from which the fluid is discharged, the valve when actuated functioning to maintain the pressure of fluid fed to the applicator at a substantially constant level, said valve comprising:

• A. a housing having an input section adapted to be connected to said pressurized fluid supply, an outlet section adapted to be connected to said applicator, and a diaphragm chamber interposed between said input and output sections, said diaphragm chamber being in communication with said output section and being separated from said input section by a barrier wall having a port extending therethrough;
• and
• B. a modulating unit including a diaphragm assembly in said diaphragm chamber connected to throttle head in said input section by a stem, said stem extending through and cooperating with said port to define a flow passage and said throttle head coacting in spaced relationship with said barrier wall to define an orifice leading to said flow passage, said modulating unit being movably responsive to variations in the pressure of the fluid being supplied to said input section to maintain the pressure of the fluid being delivered to said applicator via said flow passage, diaphragm chamber and output section at a substantially constant level by varying the size of said orifice as an inverse function of the fluid pressure in said input section, said valve being automatically opened when the varying pressure of the fluid being supplied to said input section exceeds a predetermined minimum level, and being automatically closed when said varying pressure is insufficient to achieve valve actuation.

A regulating valve adapted to be interposed between a pressurized fluid supply whose pressure varies and a fluid applicator from which the fluid is discharged, the valve when actuated functioning to maintain the pressure of fluid fed to the applicator at a substantially constant level, said valve comprising:

• A. a housing having an input section adapted to be connected to said pressurized fluid supply, an outlet section adapted to be connected to said applicator, and a diaphragm chamber interposed between said input and output sections, said diaphragm chamber being in communication with said output section and being separated from said input section by a barrier wall having a port extending therethrough, said barrier wall having a ring thereon surrounding said port and protruding from said barrier wall into said diaphragm chamber;
• B. a modulating unit including a diaphragm assembly in said diaphragm chamber connected to throttle head in said input section by a stem, said stem extending through and cooperating with said port to define a flow passage and said throttle head coacting in spaced relationship with said barrier wall to define an orifice leading to said flow passage;
• and
• C. spring means for resiliently urging said modulating unit into a closed position at which said diaphragm assembly is pressed against said ring to cooperate therewith in defining a pressure chamber open to said input section via said flow passage and closed to said diaphragm chamber, said modulating unit being shiftable from said closed position to an open position in response to fluid pressure above a predetermined level in said pressure chamber and being movable when in said open position in response to variations in the pressure of the fluid acting on said diaphragm assembly to vary the size of said orifice in a manner such as to maintain the pressure of the fluid being delivered to said applicator via said flow passage, diaphragm chamber and output section at a substantially constant level.