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A pneumatically operated device. The pneumatically operated device comprises a movable member disposed within a housing. The movable member is operable to control operation of the device. Pressurized air is directed to a first side of the movable member to drive the movable member in a first directi

A pneumatically operated device. The pneumatically operated device comprises a movable member disposed within a housing. The movable member is operable to control operation of the device. Pressurized air is directed to a first side of the movable member to drive the movable member in a first direction to operate the device. The pneumatically operated device comprises a check valve disposed through an opening in the housing to enable air to vent from a second side of the movable member. The check valve may comprise a flexible cover extending over the opening and biased against the housing to form a seal.

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What is claimed is: 1. A spray device, comprising: a housing assembly; a pneumatically operated spray control system disposed within the housing assembly and operable to control liquid flow though the spray device, wherein the pneumatically operated spray control system comprises a chamber, a pisto

What is claimed is: 1. A spray device, comprising: a housing assembly; a pneumatically operated spray control system disposed within the housing assembly and operable to control liquid flow though the spray device, wherein the pneumatically operated spray control system comprises a chamber, a piston movable in the chamber, a spring disposed on a first side of the piston and configured to bias the piston in a first direction, and an air passage leading to a second side of the piston and configured to selectively provide air pressure to bias the piston in a second direction opposite from the first direction, wherein the piston is coupled to a valve member leading to a spray formation section of the spray device; and an umbrella-type check valve disposed through an opening in the housing assembly, wherein the umbrella-type check valve is coupled to an outer wall of the chamber of the housing assembly, wherein the umbrella-type check valve has only a one-way direction of flow out of the housing assembly to enable air to vent from within the housing assembly and to block external liquid from entering the housing assembly, and the umbrella-type check valve is configured to enable the air to vent in response to operation of the pneumatically operated spray control system to control the liquid flow. 2. The spray device of claim 1, wherein the housing assembly comprises a body and a cap secured to the body, the umbrella-type check valve being disposed though an opening in the cap. 3. The spray device of claim 1, wherein the umbrella-type check valve comprises a flexible bell-shaped portion that is biased to form a seal against the outer wall, the flexible bell-shaped portion being flexible to enable pressurized air from within the chamber to unseat the flexible bell-shaped portion from the outer wall and escape chamber. 4. The spray device of claim 3, wherein the umbrella-type check valve comprises a flanged portion that captures the outer wall between the flanged portion and the flexible bell-shaped portion. 5. The spray device of claim 4, wherein the umbrella-type check valve comprises a stem that couples the flanged portion to the flexible bell-shaped portion, the stem having a slot to enable air to flow from the chamber to the flexible bell-shaped portion. 6. The spray device of claim 1, wherein the umbrella-type check valve comprises a stem extending through the opening, and the stem comprises an air channel configured to enable the air to vent from chamber. 7. The spray device of claim 6, comprising a bell-shaped portion coupled to the stem, wherein the bell-shaped portion is disposed on an exterior of the outer wall. 8. The spray device of claim 1, wherein the umbrella-type check valve is configured to vent a pneumatic leak across a sealed portion of the pneumatically operated spray control system. 9. The spray device of claim 1, wherein the valve member is configured to open and close a liquid flow path to a liquid spray exit. 10. The spray device of claim 1, wherein the spray formation section comprises a liquid nozzle having a liquid spray exit and a valve abutment surface, the valve member is configured to move toward the valve abutment surface to reduce liquid flow to the liquid spray exit, and the valve member is configured to move away from the valve abutment surface to increase liquid flow to the liquid spray exit. 11. The spray device of claim 10, wherein the spray formation section comprises an passage leading to an air shaping port, an air atomization port, or a combination thereof. 12. The spray device of claim 1, wherein the pneumatically operated spray control system comprises a diaphragm between the outer wall and the piston. 13. A spray device, comprising: a spray head comprising a liquid spray outlet; a pneumatically operated spray control system, comprising: a wall disposed about a chamber; a piston movable in the chamber; a valve member coupled to the piston, wherein the valve member is configured to adjust flow of a liquid to the liquid spray outlet, and the valve member extends into the spray head; and an air passage leading to the chamber to bias the piston between first and second positions; and an umbrella-type check valve coupled to the wall of the pneumatically operated spray control system, wherein the umbrella-type check valve has only a one-way direction of flow out of the chamber in response to movement of the piston. 14. The spray device of claim 13, comprising a spring disposed against the piston. 15. The spray device of claim 13, comprising a diaphragm disposed between the piston and the wall. 16. The spray device of claim 13, wherein the spray head comprises a liquid nozzle having a liquid passage leading to the liquid spray outlet, and the valve member opens and closes against the liquid nozzle. 17. The spray device of claim 16, wherein the valve members extends into the liquid nozzle in a concentric arrangement with the liquid nozzle. 18. The spray device of claim 13, wherein the spray head comprises an air passage leading to an air shaping port, an air atomization port, or a combination thereof. 19. The spray device of claim 13, wherein the wall comprises an annular wall having an axial end wall, and the umbrella-type check valve is coupled to the axial end wall. 20. The spray device of claim 13, wherein the valve member closes flow of the liquid to the liquid spray outlet in the first position of the piston, the valve member opens flow of the liquid to the liquid spray outlet in the second position of the piston, and the air passage routes air to the chamber to bias the piston from the first position toward the second position. 21. The spray device of claim 13, wherein the an umbrella-type check valve comprises a stem, a bell-shaped portion disposed at a first end of the stem, and a flange portion disposed at a second end of the stem, wherein the stem extends though an opening in the wall. 22. The spray device of claim 21, wherein the bell-shaped portion is disposed against an exterior surface of the wall, the flange portion is disposed against an interior surface of the wall, and the stem comprises an exterior slot disposed against the opening from the interior surface to the exterior surface. 23. A spray device, comprising: a liquid spray nozzle; a pneumatically operated spray control system, comprising: a wall disposed about a chamber; a piston movable in the chamber; a valve member coupled to the piston, wherein the valve member is configured to adjust flow of a liquid to the liquid spray nozzle, and the valve member extends into the liquid spray nozzle; a spring biasing the piston in a first direction toward a first position; an air passage leading to the chamber to bias the piston in a second direction toward a second position, wherein the second direction is opposite from the first direction; and an umbrella-type check valve coupled to the wall of the pneumatically operated spray control system, wherein the umbrella-type check valve has only a one-way direction of flow out of the chamber in response to movement of the piston. 24. The spray device of claim 23, wherein the valve member opens and closes against the liquid spray nozzle. 25. The spray device of claim 23, comprising an air passage leading to an air shaping port, an air atomization port, or a combination thereof. 26. The spray device of claim 23, wherein the wall comprises an annular wall having an axial end wall, and the umbrella-type check valve is coupled to the axial end wall. 27. The spray device of claim 23, wherein the valve member closes flow of the liquid to the liquid spray nozzle in the first position of the piston, and the valve member opens flow of the liquid to the liquid spray nozzle in the second position of the piston. 28. The spray device of claim 23, wherein the an umbrella-type check valve comprises a stem, a bell-shaped portion disposed at a first end of the stem, and a flange portion disposed at a second end of the stem, wherein the stem extends though an opening in the wall. 29. The spray device of claim 28, wherein the bell-shaped portion is disposed against an exterior surface of the wall, the flange portion is disposed against an interior surface of the wall, and the stem comprises an exterior slot disposed against the opening from the interior surface to the exterior surface.