Title:
BALL VALVE
Document Type and Number:
Japanese Patent JPS6117771
Kind Code:
A
Abstract:
PURPOSE:To prevent an abnormal increase of pressure in a body cavity by acting relaxing force upon a sheet retainer when pressure in the body cavity reaches a designated pressure to connect the body cavity with a fluid passage. CONSTITUTION:When pressure in a body cavity 10 exceeds a designated permissible range and increases abnormally, a sub-piston 35 is moved to the left against a compression spring 45, so that a main piston 34 is moved to the left by a rod of the sub-piston. A close chamber 13 is connected to a fluid passage 3 on secondary side, and relaxing force acts upon a sheet retainer 4, so that the sheet retainer is retreated to the back side. Thus, the body cavity 10 is connected to the fluid passage on secondary side, and pressure in the body cavity is discharged to the secondary side to prevent an abnormal increase in pressure.
Inventors:
NAKANISHI SADAYUKI
FUKUNAGA AKIO
FUKUNAGA AKIO
Application Number:
JP13758984A
Publication Date:
January 25, 1986
Filing Date:
July 02, 1984
Export Citation:
Assignee:
KOBE STEEL LTD
International Classes:
F16K5/20; F16K5/06; F16K39/06; (IPC1-7): F16K5/20
Attorney, Agent or Firm:
Makino Itsuro
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