Patent ID: 6966365
Filing Date: 2005-11-22
Classification: B60H,F25B,F28F,Y10T

Abstract:
1. An outflow prevention device for preventing outflow of fluid flowing through a heat exchanger due to breakage of the heat exchanger, characterized by comprising: a check valve arranged on a fluid outlet side of the heat exchanger, for allowing the fluid to flow only in a direction in which the fluid flows out from the heat exchanger, and a shut valve arranged on a fluid inlet side of the heat exchanger, for opening and closing in a manner interlocked with opening and closing operations of said check valve, to thereby control flow of the fluid flowing into the heat exchanger, wherein said shut valve has a valve seat formed in an intermediate portion of a passage via which introduced fluid is guided out, a valve element arranged in a manner opposed to said valve seat from an upstream side such that said valve element can move to and away from said valve seat, and a piston fixed to said valve element, and wherein a chamber on an opposite side of said piston to said valve element and a chamber on a downstream side of said check valve are communicated with each other whereby pressures before and behind said check valve are applied to said valve element and said piston, respectively.