Constant flow valve actuator

摘要

A dispensing valve mechanism which includes means for automatically maintaning a constant flow of fluid through a flow channel under varying fluid source pressure utilizes a piston movable within a chamber in response to fluid pressure to regulate the available flow area of a single outlet port in the chamber. The piston is sized to permit fluid flow around the periphery of the piston, and may have an axial flow path therethrough to serve as the primary flow path through the valve mechanism. A spring yieldably opposes axial movement of the piston that would tend to decrease the effective area of the chamber outlet port. An adjustment screw is carred in the valve body for adjusting the force exerted by the spring. The valve is particularly suited for use in liquid dispensing apparatus. The valve mechanism is operated by a pivoted arm which includes a projection thereof that engages an electrical switch which causes a solenoid to open the valve. The arm further includes a transverse member which mechanically engages a lever to open the valve.