Is used for the water supply tube structure of the small caliber tube propulsion unit the check valve

摘要

PROBLEM TO BE SOLVED: To establish a pipe structure and provide a check valve for use therefor, whereby water and light can pass through a small bore pipe and muddy water will not counter-flow from the nozzle provided at the tip. ;SOLUTION: A gap 31 admitting water passage is provided in a small-bore pipe to be propelled, and a water nozzle 39 is provided opening outside the foremost part of a propulsive head 11, wherein water passages 40a, 40b, 40c are formed leading from the water nozzle 39 to the gap 31, and a check valve 41 is installed on the way of the passages 40a, 40b, 40c. The check valve 41 is composed of a body part capable of being fited in the passages 40a, 40b, 40c, a water passing hole 42 provided in the body part as penetrating in the direction of the passages, and a packing 43 furnished at the propulsive head side opening of the hole 42.;COPYRIGHT: (C)1998,JPO