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Title:
PISTON VALVE-SEALING STRUCTURE AND PISTON VALVE FLUID CONTROL METHOD
Document Type and Number:
WIPO Patent Application WO/2018/066121
Kind Code:
A1
Abstract:
The purpose of the present invention is to improve the durability of a valve plug sealing structure. A three-way valve (1), which is an example of a piston valve-sealing structure that is an application of the present invention, comprises a valve box (2), a valve stem (3) and a valve plug (4). The valve stem (3) is a metal rod-shaped member that reciprocates vertically in a known piston structure (not shown). For the valve plug (4), an upper guide washer (21) is installed on the valve stem (3) adjacent to an upper disc ring (19). The outer diameter of the upper guide washer (21) portion is formed to be slightly smaller than the internal diameter of a flat part (12) of a first valve seat (11). A lower guide washer (22) is installed on the valve stem (3) adjacent to a lower disc ring (20). The outer diameter of the lower guide washer (22) portion is formed to be slightly smaller than the internal diameter of a flat part (16) of a second valve seat (15).

Inventors:
ICHIMARU HIRONOBU (JP)
Application Number:
JP2016/079913
Publication Date:
April 12, 2018
Filing Date:
October 07, 2016
Export Citation:
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Assignee:
ICHIMARU GIKEN CO LTD (JP)
International Classes:
F16K1/34; F16K1/44
Foreign References:
JPH01193469A1989-08-03
JPS57140973A1982-08-31
Attorney, Agent or Firm:
ARIYOSHI Shuichiro et al. (JP)
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