| 摘要 |
PURPOSE:To perform a pressure resistance test without making the water pressure of a hydraulic pump higher than testing pressure, by connecting a large number of high pressure hoses from the hydraulic pump in parallel to pressurize the same and providing a special valve to each of the high pressure hoses on the outlet side thereof. CONSTITUTION:A large number of high pressure hoses 41-4n are connected from a hydraulic pump 1 in parallel and the detection of the non-piercing hose is performed on the outside side of each of the high pressure hoses 41-4n through a special valve. For example, when the first high pressure hose 41 is a non-piercing product, the pistons of the special valves 131-13n are operated and the pressure from the connection hose 5 of the high pressure hose 42 does not communicate with a pressure outlet 22 and, therefore, a pressure switch 7 is not operated. When the high pressure 42 is pierced, the pressure from the pressure inlet 20 on the upstream side reaches the next valve, and when all of the high pressure hoses are not non-piercing products, the pressure switch 7 is finally operated by the repetition of the above-mentioned operation. After a pressure resistance test, the seal jigs 3b1-3bn of the high pressure hoses on the outlet side thereof are detached and the high pressure hoses are closed on the side of the hydraulic pump and compressed air from an air compressing side is blown in a state of parallel arranged pipings to make it possible to remove moisture at once.
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