B - Operations – Transporting – 60 – T
Patent
B - Operations, Transporting
60
T
303/74
B60T 15/02 (2006.01) B60T 13/12 (2006.01) F16D 65/74 (2006.01)
Patent
CA 1083203
TWO STAGE POWER VALVE Abstract of the Disclosure A power brake valve and a related braking system are disclosed. The valve comprises a housing defining a first bore of large diameter and a second bore of smaller diameter, and annular pistons are slidably disposed within each bore. A bi- ended rod, also slidable within the bores, carries reaction pistons which are radially extended to cover the annular flow space of the adjacent,associated annular pistons. When the rod is pulled in a power mode of operation, each annular piston moves toward the associated annular piston to restrict and halt the normal flow of fluid through the annular piston and create a movable end wall. As pressure rises within the chambers, pres- surized fluid is discharged from the valve to brake units to cause braking action In a manual mode of operation, pulling action on the rod causes a relatively large quantity of relative- ly low pressure fluid to be discharged from the first chamber so as to quickly and effectively take up systemic clearances within the brake system. Further pulling action on the rod causes a relatively small quantity of relatively high pressure fluid to be ejected from the second chamber to cause effective braking action without overextended brake pedal movement.
309930
Lambert Brake Corporation
Smart & Biggar
LandOfFree
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