Pressure relief valves are an essential part of a hydraulic system to ensure that the components of the system function properly and remain efficient over time. The M40 valve has the task of protecting the system from excessive working pressures, preventing breakage or malfunction.

The M40 is a direct-acting valve. A positioned poppet opens the oil passage when the system pressure reaches the set value. The opening pressure of the valve can be set by means of the adjustment screw.

Different setting ranges are available for opening pressures up to 350 bar.

The maximum working pressure for the M40 valve is 350 bar, and it is recommended for use with flow rates up to 40 l/min.

The M40 valve is a parts-in-body valve and can be installed inside a metric cavity with M20x1.5 thread. 

The external components are made of high-strength steel and are protected against corrosion by a zinc treatment. For applications exposed to particularly aggressive corrosive agents (e.g. marine applications) a zinc-nickel surface treatment is available.

The M40 valve setting can be protected against tampering by applying a plastic safety cap to the cartridge.