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专利名称：Pumping valve发明人：Vincent Passalacqua申请号：US07/723486申请日：19910701公开号：US05125545A公开日：19920630
摘要：A valve for pumping a viscous fluid from a holding container includes a valvebody having a fluid chamber, and a piston displaceable in the fluid chamber for pumpingfluid from the fluid chamber through an outlet openings. The piston is attached to theend of a shaft which extends out of the valve. A hub with a plurality of openings and aresilient washer on its peripheral edge are slidably located on the shaft in the fluidchamber. When the piston is in contact with the hub it blocks the flow of fluid throughthe opening. When the hub is axially displaced from the piston, fluid is allowed to flowthrough the openings. Depression of the plunger causes movement of the piston awayfrom the hub because of frontal engagement of the resilient washer with the walls of thefluid chamber. This allows the fluid to flow around the piston. Further movement of theshaft causes a projection on the shaft to engage the hub. The projection overcomes thefrictional engagement and moves the hub along with, but displaced from, the pistonthrough the chamber. The fluid contained in the chamber flows through the openings inthe hub above the hub. Upon release of the plunger, a spring biases the piston upward toengage the hub and close its opening. During the movement of the piston and hub totheir initial positions, under the spring bias, the fluid is pumped out of the outlet openingof the valve and substantially simultaneously enters into the lower portion of the valve
chamber from the fluid-holding container.
申请人：MAKK-O INDUSTRIES, INC.
代理机构：Darby & Darby
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