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Pump and valve apparatus
| Details |
Inventors: Koiwa, Yoshinobu;
Assignee: Koiwa; Yoshinobu (Chiba, JP); Kabushiki Kaisha Little Rock (Chiba, JP); Kelbin Co., Ltd. (Tokyo, JP); Fujimori; Shuichi (Fujishawa, JP)
Primary Examiner: Nilson; Robert G.
Assistant Examiner:
Attorney, Agent or Firm:
A pump consists of a valve box in which a valve chamber inlet and outlet are each provided with a valve, and 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 said concavity. 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. |
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DETAILED DESCRIPTION An object of the present invention is to provide a pump and valve apparatus that offers reliable valve operation with improved durability.
To achieve this object, according to the present invention, in a pump apparatus comprised of a valve box in which a valve chamber inlet and outlet are each provided with a valve, and a reciprocating member which moves reciprocally in a cylinder that communicates with the valve chamber of the valve box to open the said 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, and contained on the cylinder side of the pressure action chamber divided by the pressure force member is an action medium that transmits to the pressure force member changes in volume of the pressure action chamber produced by the action of the reciprocating member.
The invention also comprises a valve device comprising a valve seat the seating portion of which is formed as a recess corresponding to a spherical surface; a prescribed number of fluid passages formed therein opening into the recess; a valve-piece having a surface corresponding to the valve seat recess; and a valve spring that resiliently maintains the valve-piece on the concave surface of the valve seat; wherein at least one of the valve seat and valve-piece is formed of, or covered with, a hard resilient material, or one is formed of a hard resilient material and the other is covered with a hard resilient material.
In addition, the valve seat and valve-piece may be made of wood instead of the hard resilient material.
The suction effect of the reciprocating member causes the volume enclosed by the pressure force member to contract by a set amount, which produces a negative pressure in the valve chamber that opens the valve on the inlet side, drawing fluid into the interior of the valve chamber.
When the reciprocating member performs an expulsion action, the pressure force member is expanded, via the action medium, by the volume of the expulsion movement of the reciprocating member
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Ring Tones 
