"Getting the cooling circuit up to optimum operating temperature very quickly"

Bucher Hydraulics are adding a size 10 cooler-bypass thermostat valve to their product range complementing the size 16 which is already established in the hydraulics market. This new screw-in cartridge for temperature-dependent bypass control with an integrated excess pressure function can be fitted straight to the cooling unit but is also suitable for installation with line-mounting housing.

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Temperature controlled cooler-bypass thermostat valves in size 10 are high-performance, direct acting screw-in cartridges with M27x2 threads suitable for installation straight into the cooler unit or with line mounting housings. Depending on the temperature of the oil, they route the flow either straight to tank or through the cooler.

When the oil is cold (< 60°C), the connection P → T is open (bypass), which means that the flow is directed to tank with minimal head loss and the oil warms up rapidly. After the changeover temperature is reached (> 60°C), the integral thermostat element closes the connection P → T. The valve now directs the oil flow through the cooler. With an integral pressure-relief function, the bypass thermostat cartridge also safeguards the cooler by protecting it from any pressure peaks that may result from excessive flow. All external parts of the cartridges are zinc plated and chromited (CrVI−free) and are thus suitable for use in the harshest operating environments.