Valve for check device and valve system of brake hose check apparatus equipped with check valve

摘要

The present invention is applied to a brake hose pressure measuring device capable of automatically performing a pressure test by being compatible with various types of brake hoses, a valve system for controlling the flow of compressed air of high pressure and low pressure, and a valve system of a pressure measuring device equipped with the valve It is intended to provide. That is, the present invention in the valve system of the pressure gauge device, the injection nozzle 14 is fastened to the first bracket to inject compressed air, the shut-off valve 24 to close the second bracket, and the injection nozzle ( 14) connected to the high and low pressure valves (300) (300') by supplying high and low pressure compressed air by on/off operation to brake brake (1) pressure leak and clogging failure, and high pressure sensor (33) ( 38) is composed of a pneumatic inspection unit 30 provided to be measured, the high and low pressure valves 300 and 300' are provided with a valve cylinder 320 provided with a supply port 322 and a discharge port 324. , Needle seat portion 340 provided in the valve cylinder 320 and having a through-hole 342 formed in the center, and inserted into the valve cylinder 320 to be linearly conveyed by the drive cylinder 310 and needle seat portion Includes a needle 360 provided to open and close the through hole 342 of 340, and a ceramic ball 380 that is detachably installed in the intaglio groove at the end of the needle 360 and directly contacts the through hole 342. It characterized in that it is made.