Patent ID: 6311714
Filing Date: 2001-11-06
Classification: F16K,G05G,Y10T

Abstract:
A seismic detecting shut-down valve device which comprises:a fluid path opening/closing valve for opening and closing a fluid path;an emergency shut-down air cylinder connected to the fluid path opening/closing valve and having a piston actuated by compressed air; a seismic detecting valve; and an air tank connected to the emergency shut-down air cylinder and the seismic detecting valve, compressed air being sent to the emergency shut-down air cylinder to lower the piston to close the fluid path by the fluid-path opening/closing valve, when said seismic detecting valve detects earthquake which has over predetermined seismic intensity, wherein the fluid path opening/closing valve comprises a rack and a plate-like valve plug, said rack being fixed to the piston of the emergency shut-down air cylinder.