VALVE

Japanese Patent JP3772381

B2

PROBLEM TO BE SOLVED: To reduce resistance of a valve for opening and closing a liquefied gas passage of a device utilizing liquefied gas.
SOLUTION: A valve comprises a valve element 1, a valve seat 2, a coil spring 3, a driving force generating part 10 and a control part 11, wherein the valve seat 2 and the coil spring 3 are disposed opposite to the valve element 1, the coil pitches 12, 13 of the coil spring 3 are set to plural values, and when the driving force generating part 10 is operated by the control part 11, the control part 11 is repeatedly operated and then operates the part 1. Accordingly, when compression is small, the load value is determined by the spring constant of the whole of the coil spring 3, and when compression becomes large, the coil pitch A10 of the coil spring 3 closely contacts to lose a spring function, and the load value is determined by a spring constant of the coil pitch B13 which does not closely contact. Accordingly, the spring constant when the valve element 1 is operated is reduced remarkably, and the control part 11 is repeatedly operated and then operated so that the driving force generating part 10 sequentially increase the momentum of the valve element 1 to operate the valve element 1, thereby smoothly operating the valve element keeping its balance with the weight and the coil spring 3.

Kozo Kokawa
Yasuaki Tawa

JP7855496A

May 10, 2006

April 01, 1996

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Matsushita Electric Industrial Co., Ltd

F16K21/04; F16K31/06; (IPC1-7): F16K31/06; F16K21/04

JP7332530A
JP8042736A
JP60053285A
JP6323559A
JP4320715A
JP7139323A
JP62089578U
JP62288784A
JP61248972A
JP48007316A
JP57069405A
JP60196475A
JP56127869A
JP5032603B2

Fumio Iwahashi
Hiroki Naito
Daisuke Nagano

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