| 摘要 |
PURPOSE:To prevent maloperation for raising the reliability of a valve device by providing a check valve to close pathway by lowering of the pressure of compressed air to the valve device adaptable to the detection and control of the derailment of railway vehicles, etc., particularly. CONSTITUTION:In a valve device 42, a valve 8 is interrupted with the communication between an inlet hole 5 and an outlet hole 7 when a spring 27 is pressed, and in the same way, when a weight valve 29 is put on a spring 39 and a projection 37 is contacted with a valve seat 38, communication between a through hole 34 and a chamber 28, or the communication between a chamber 15 and outside through a through hole 40, is interrupted. Under the condition, when compressed air is supplied to an inlet 5, the air is supplied even to the chamber 15 through orifices 22 and 24 and directed to below the projection 37 facing the through hole 34. Under the condition, when a running vehicle is derailed and an acceleration is added to the valve device, compressed air is discharged from the outlet hole 7 to outside. By this, the derailment of vehicle can be detected and control for the derailment can be made. |
