Seismic detecting shut-down valve device
AssigneeNichigi Engineering Co., Ltd.
InventorSusumu Watanabe
Life of this patent
Estimating the term…
Abstract
A fluid path opening/closing valve comprises a plate-like valve plug and a rack which is fixed to a piston of an emergency shut-down air cylinder. The rack meshes with a pinion which rotates by a reversible motor with a clutch. If a seismic detecting valve detects earthquake which has over predetermined seismic intensity and opens, compressed air is sent from an air tank via the opened seismic detecting valve to a switching cylinder which disconnects the clutch. At the same time, compressed air is sent from the air tank to the emergency shut-down air cylinder via a delay valve to lower the piston with the fluid-path opening/closing valve which closes the fluid path.
Claims9
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.
Dependencies are inferred from the claim text.