| 摘要 |
An automatic purge valve 110 for removing air and/or vapor from a fluid pressure operated brake system. The valve comprises a chamber 120 disposed in a brake assembly that includes a pair of opposed coaxially aligned valve seats 120b, 134b and a valve member 130 disposed in the chamber and engagable with either of the seats. The seat 134b communicates with a brake coolant system 58; the other valve seat 120b communicates with a piston retraction fluid chamber 90. The valve member is biased towards the one valve seat 120b by pressure in the coolant system and is driven toward the other valve seat 134b during brake actuation by fluid pressure in the piston retraction fluid chamber. Air and/or vapor is discharged from the retraction fluid circuit into the coolant circuit as the valve member travels from the seat 120b to the seat 134b each time the brake assembly is actuated.
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