Patent ID: 6170522
Filing Date: 2001-01-09
Classification: F16L,Y10T

Abstract:
An improvement in a self-sealing-type double tube joint having a pair of tubular outer shells;each of the outer shells having a tubular inner barrier wall fixed therein so as to form a double flow passage having an inner flow passage and an outer flow passage; and a movable valve element inserted between the barrier wall and the outer shell with interposing a sealing member so as to be urged forward by a spring device;the inner flow passages and outer flow passages being able to be connected independently by combining the pair of outer shells mutually so that the inner barrier walls push the movable valve elements; andthe inner flow passages and outer flow passages being able to be sealed from outside air by separating the pair of outer shells;said improvement is characterized that:the joint is constructed such that the outside air in a contacting sealed portion flows out of the tubular barrier wall, before the tubular inner barrier walls contact the movable valve elements so as to dam the contacting sealed portions of the inner flow passages and the outer flow passages from outside air.