Patent ID: 8864052

Claim:
A sprayer comprising: a housing, said housing having a piston bore; a piston reciprocally mounted within said piston bore; a flow passage within the housing for the passage of liquid from a passage inlet to a passage outlet; an actuator operable to reciprocate the piston within the piston bore between a vacuum stroke that is configured and adapted to create reduced pressure in the piston bore and a compression stroke that is configured and adapted to create increased pressure in the piston bore; a valve assembly within the flow passage for controlling the flow of liquid through the flow passage upon operation of the actuator, said valve assembly further comprising a check valve and a priming valve; a closure that is configured and adapted to mount the sprayer to a container; an outer cover attached to the housing, the outer cover comprising an internal surface; and a return spring operatively connected to the internal surface of the outer cover and providing a bias against said actuator that forces the return of the actuator to an at rest position after each compression stroke of the piston.