JPH0227072U - - Google Patents

Description

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional front view of the first embodiment of the present invention, FIGS. 2 A and B are explanatory diagrams of its operation, and FIGS. 3 A and B are longitudinal sectional views of main parts showing a modification of the poppet valve body. 4 is a longitudinal sectional front view of the second embodiment, FIG. 5 is a longitudinal sectional front view of the third embodiment, and FIG. 6 is a longitudinal sectional front view of a known balance poppet valve. 5A, 5B, P, A, R...Port, 6, 35
, 36, 55... Valve seat, 9... Pressure equalization chamber, 10...
Sliding seal ring, 12... Closing spring, 21, 3
1, 51... Valve part, 22, 32, 52... Operation part, 24, 24A, 24B, 24C... Poppet valve body, 25, 28, 29... Cylindrical part.

Amendment September 21, 1983 The name of the invention is amended as follows. Title of the invention: Balanced poppet valve The claims for utility model registration and the brief description of the drawings are amended as follows. [Claim for Utility Model Registration] Behind a poppet valve element that opens and closes a valve seat between a plurality of ports, a pressure equalizing chamber with approximately the same diameter as the seal diameter of the valve seat is formed, and the pressure equalizing chamber is formed in the poppet valve element. A cylindrical portion that slides on the inner circumferential surface of the chamber is provided, and a seal ring is provided on the inner circumferential surface of the pressure equalizing chamber to seal between the outer circumferential surface of the cylindrical portion. In a balanced poppet valve in which the pressure chamber and the flow path on the opposite side are communicated through a pressure equalizing hole, and the poppet valve element is driven by an operating part, the valve seat is set in the closed position of the valve seat by the poppet valve element in the cylindrical part. A balanced poppet valve characterized by forming an outer circumferential surface that comes into close contact with a seal ring and comes into loose contact with the seal ring when the valve seat is in the open position. [Brief Description of the Drawings] Fig. 1 is a longitudinal sectional front view of the first embodiment of the present invention, Figs. 2 A and B are explanatory diagrams of its operation, and Figs. 3 A and B show modifications of the poppet valve body. 4 is a longitudinal sectional view of the main part, FIG. 4 is a longitudinal sectional front view of the second embodiment, FIG. 5 is a longitudinal sectional front view of the third embodiment, and FIG. 6 is a longitudinal sectional front view of a known balanced poppet valve. 5A, 5B, P, A, R...Port, 6, 35
, 36, 55... Valve seat, 9, 39, 57... Pressure equalization chamber, 10, 50, 68... Seal ring, 21,
31, 51... Valve part, 22, 32, 52... Operation part, 24, 42, 43, 59... Valve body, 25, 4
6, 47, 66...cylindrical part, 26, 48, 49, 6
7...Pressure equalization hole.

Claims (1)

[Claims for Utility Model Registration] A plurality of ports, a valve seat in a passage that communicates these ports, a pressure equalizing chamber with a diameter substantially the same as the seal diameter of the valve seat facing the valve seat, and a pressure equalizing chamber with a diameter substantially equal to the seal diameter of the valve seat facing the valve seat. A poppet valve body is provided with a pressure equalizing hole that communicates the pressure chamber and a cylindrical portion that slides within the pressure equalizing chamber, a sliding seal ring that seals the outer circumferential surface of the cylindrical portion, and a poppet valve body that is connected to the valve seat in the closing direction of the valve seat. A balance poppet valve comprising a valve part having a closing spring that biases the valve body, and an operating part that drives the valve body, wherein the cylindrical part airtightly abuts a sliding seal ring in a closed position of the valve seat. A balanced poppet valve, comprising: an outer circumferential surface that loosely abuts a sliding seal ring in the open position of the valve seat.