| 摘要 |
PURPOSE:To provide an automatic contraflow preventing function for a jet nozzle by setting a spring to give a force to a valve in such a way as to enable it to fit into the hole of the nozzle tip all the time in the space on the rear end side of a piston inside a cylinder provided in the casing of the nozzle valve. CONSTITUTION:A bar valve 24 is integrally provided to a piston 22 inside a cylinder body 14 provided in a casing 12. When the piston 22 is pushed by the force of the spring 31, the valve 24 is fitted into the hole 23 of the nozzle tip 20 to close the hole 23. Then, when the pressure water is sent into the space 19 and central hole 17 of the nozzle valve through a pipe 34, the pressure acts on the piston 22 move it backwards. Accordingly, the valve 24 is slipped out of the hole 23 and jet water stream is allowed to inject. Furthermore, when the supply of water is stopped, the valve 23 is restored to its original state in which the hole 23 is closed. |
