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Axial Piston Pumps, Motors, and Transmissions
Series 70 / 15 Series
Easy-Ride Valves
The Series 70 BDU-21L transmissions are available
with optional Easy-Ride valves to reduce the rate of
change in acceleration (“jerkiness”) in vehicle propel
applications. Each Easy-Ride valve incorporates a
poppet-piston, sleeve assembly, valve spring, and
plug.
A sudden increase in pressure in one side of the
closed loop will open the corresponding Easy-Ride
valve, allowing some high pressure fluid to flow to the
opposite side of the loop through the charge circuit
and charge check. This limits the pressure rise rate in
the loop and reduces the acceleration rate of the
vehicle.
The poppet-piston, sleeve assembly, and spring act
as an accumulator. Once system pressure builds-up
between the poppet-piston and sleeve assembly, the
poppet-piston will move toward its seat, closing the
passage.
A typical Easy-Ride valve cycle requires 0.5 to 1.0
seconds, depending on system oil viscosity and loop
pressure. If the loop pressure is above the functional
range of the valve (approximately 1500 psi [103 bar]),
the valve spring will compress until the sleeve assem-
bly contacts the plug, and the poppet-piston will be
rapidly forced onto its seat.
Description of Operation for Series 70 and 15 Series Products (Continued)
Easy Ride Valve Circuit
FROM
CHARGE
PUMP
CHARGE
CHECK
VALVES
INPUT
PV
EASY-RIDE
VALVES
(OPTION)
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