Flush manifolds for transmission circuits

Hydrostatic transmission circuits are closed systems where the oil returns from the actuator back to the inlet of the transmission pump.

Since the oil normally does not flow to a separate tank, it is important to cool the oil in a transmission circuit.

To protect the motor, two shock valves can also be added.

How we solve cooling in transmission circuits

Our transmission circuit systems include a special shuttle valve that can redirect oil from the low-pressure side for cooling. The charge pump’s task is then to compensate for that flow or leakage and maintain a constant oil volume.

These shuttle valves are designed so that the side with the lowest pressure is connected to the outlet, known as a 'low-side shuttle'.

Mounting and material of transmission circuits

Available for line mounting in sizes up to SAE 1 ½” flange.

All manifolds are available in aluminum (3000 psi / 210 bar) or steel (5000 psi / 350 bar) and can be supplied with surface treatment.

Protecting the motor in transmission circuits

When motor protection is required, dual shock valves can be integrated into the manifold.

See below for a schematic of a transmission manifold with dual shock valves.