The MZD is a stackable three-port pressure reducing valve, direct operated. The valve is normally open and the hydraulic fluid flows freely through it. The spool is subjected on one side to the inlet pressure and on the other to the adjustment spring. When the pressure in the P line exceeds the value set by the spring, the valve closes until the pressure at the P outlet equals the set value. The three-way design provides protection of the secondary circuit from pressure surges since it allows a reverse flow from the actuator to the T discharge line. The variable adjustment version is supplied with a hexagonal head adjustment screw. Upon request, it can be equipped with a SICBLOC adjustment knob. The fixed adjustment version is available set at value 20, 25 or 30 bar pressure.
