| 摘要 |
PROBLEM TO BE SOLVED: To prevent brake trailing originating from poor performance of air exhaustion from a solenoid selector valve. SOLUTION: With possibility of advancing and retreating, a first relay piston 160 is accommodated in a housing 166, and a first indication pressure from a brake valve 2 is introduced to a first indication pressure chamber 159 at the oversurface of the piston. The arrangement includes an inlet port 161 connected with an air tank 3, an output port 162 connected with a brake actuator 11, and an air exhaust chamber 163, which are put in mutual communication and shut off from one another by a selector valve 164. Over the first relay piston, a second relay piston 175 is installed, and its undersurface side is the first indication pressure chamber 159 while the side with oversurface is furnished with a second indication pressure chamber 174. The indication pressure chamber 174 is provided with a second indication pressure introducing port 173 for the air from the air tank 3 and an air exhaust port 196 to exhaust the air from the second indication pressure chamber 174, and the indication pressure chamber 174 is put in communication with and shut off from the introducing port and air exhaust port by a solenoid selector valve 176. The air exhaust pot 196 is connected with the exhaust chamber 163 of a relay valve 153. Accordingly the exhaust port of the solenoid valve 176 involves no risk of being blocked.
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