Prestressing System for a Liquid dispensing device has an Inlet and an outlet, a Pump Chamber,A Chamber of Valve which includes a Valve Member disposed between the pump Chamber and the Outlet comprising Said

摘要

The invention relates to a precompression system (7) for a liquid dispensing device (1), which prevents liquid from being discharged until a predetermined pressure has been built up. The precompression system (7) comprises a pump (3) for drawing liquid through an inlet (5) and discharging it through an outlet (6) and a precompression valve (27) disposed between the pump (3) and the outlet. The precompression valve (27) allows liquid in the pump (3) to reach the outlet (6) only after the predetermined pressure is established. The precompression valve (27) comprises an elastic diaphragm (32) normally closing the valve opening (30) and including a concave surface (32A) facing the valve opening (30) and in fluid conmiunication with the pump (3) and a convex surface (32B) in fluid communication with atmospheric pressure. The elastic diaphragm (32) may be stretched around a valve seat (31). The invention further relates to a method of assembling such a precompression system in a liquid dispensing device.