US 4,948,349 AGranted

Pump and valve apparatus

AssigneesYoshinobu Koiwa, Kabushiki Kaisha Little Rock, Kelbin Co., Ltd., Shuichi Fujimori

InventorYoshinobu Koiwa

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Abstract

A pump consists of a valve box in which a valve chamber inlet and outlet are each provided with a valve, and a reciprocating member in a cylinder that communicates with the valve chamber of the valve box to open the valves. A pressure action chamber is provided between the valve box and the cylinder and a pressure force member divides the pressure action chamber into a valve chamber side and a cylinder side. On the cylinder side of the pressure action chamber thus divided is an action medium that transmits to the pressure force member changes in the volume of the pressure action chamber produced by the action of the reciprocating member. A valve device consists of a concave valve seat and a number of fluid passages formed therein. Which open into the recess formed by the concave valve seat. Either the valve seat or the valve-piece is formed of, or covered with, a hard resilient material, or one is formed of the hard resilient material and the other is covered with a hard resilient material. The valve seat and valve-piece may also be made of wood.

A pump apparatus for pumping a fluid comprising:

a valve box having a valve chamber inlet, a valve chamber outlet and a valve chamber therebetween;
an inlet valve seat provided in said valve chamber inlet, said inlet valve seat having a generally concave surface with a plurality of fluid passages therein through which the fluid passes, said plurality of fluid passages straining said fluid to prevent large solid pieces in said fluid from passing therethrough, said fluid passages having outlets which are distributed around the generally concave surface of the inlet valve seat, said concave surface having an outer edge, some of the outlets being positioned at different distances from the outer edge of the concave surface then other outlets of the plurality of fluid passages;
a valve-piece movable toward and away from said inlet valve seat to respectively close and open said plurality of fluid passages;
a pressure action chamber positioned adjacent said valve box and in fluid communication therewith;
a pressure force member positioned in said pressure action chamber and dividing said pressure action chamber into a valve chamber side and a cylinder side, said cylinder side of the pressure action chamber containing an action medium;
and
a reciprocable member movable in a cylinder adjacent the cylinder side of the pressure action chamber, said reciprocable member being movable to transmit changes in volume of said cylinder side to said pressure force member to thereby move said pressure force member, movement of said pressure force member upon reciprocation of said reciprocable member in one direction causing said valve-piece to move to close said plurality of fluid passages and causing fluid in said valve chamber to be discharged therefrom, and movement of said reciprocable member in a direction opposite to said one direction causing said valve-piece to move to open said plurality of fluid passages and causing fluid to be drawn into said valve chamber through said plurality of fluid passages.

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Abstract

Claims12