Page 18 - Linde - HMF/A/V/R-02 Hydraulic motors for closed and open loop operation

Functions. Crossline relief (secondary) protection

The secondary valves (crossline relief valves) protect the system from pressure overload by using two interlinked pressure
relief valves (combined with check valves). It is recommended for applications where this protective function is not provided by
other means (e.g. through primary protection at the pump or LS valves). The secondary protection includes a make up function.
It prevents cavitation and is required in an open loop circuit if the motor requires more oil than is supplied. For special situations
like in the swing gear drive the installation of controllable secondary valves is recommended. For equipment options for Series 02
motors please refer to the model code.

Without crossline relief valve With crossline relief valve protection

With dual pressure crossline relief valve protection

A, B Work ports
L, L1, U Case drain/vent connections
X, Y Control connection for dual
pressure crossline relief valve
E Make up connection

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