Sealless dispensing mechanism

Abstract From the Canadian patent

A simplified fluid dispenser for dispensing precise quantities of fluid without requiring special seals particularly sliding seals, or springs. It comprises a housing defining a fluid reservoir, having an inlet for delivery of pressurized fluid to the reservoir and, including a valve seat defining an outlet for dispensing fluid from the reservoir. A deformable closure member overlies an open end of the housing opposite the outlet and normally biases a valve engageable with the valve seat to the closed position. When the closure member is selectively deformed, the valve is able to move to the open position to dispense a quantity of the fluid from the reservoir. When released, the closure …