High pressure relief valve (HPRV) and check valve
The TM Motors are optionally equipped with a combination high pressure relief and check valve. The
high-pressure relief function is a dissipative pressure control valve for the purpose of limiting excessive
system pressures. Each side of the transmission loop has a dedicated HPRV valve that is non-adjustable
with a factory set pressure.
When system pressure exceeds the factory setting of the valve, oil is passed from the high pressure
system loop, into the gallery, and into the low pressure system loop via the check valve. The HPRVs are
used in motor, when pump is without HPRVs.
HPRVs are set at low flow condition. Any application or operating condition which leads to elevated HPRV
flow will cause a pressure rise with flow above the valve setting. Consult factory for application.
Pressures marked on HPRV valve:
•
35 – means 350 bar [5076 psi]
•
42 – means 420 bar [6092 psi]
TMM with HPRVs and anticavitation valve
B
A
L1
M1
L2 M3 M2
High-pressure relief valve
High-pressure relief valve
Anticavitation valve
HPRV and check valve in charging mode HPRV and check valve in relief mode
Loop flushing shuttle spool
An integral loop flushing shuttle spool is used to separate system A and system B pressures, see the
schematic below.
System delta pressure will cause the shuttle spool to shift, allowing the low side system pressure to flow
to the loop flushing relief valve.
Service Manual
TMM Transit Mixer Axial Piston Motor, Size 070/084/089
Operation
10 L1211037 • Rev AC • Apr 2014
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