135 → www.festo.com/didactic Hydraulics Training Packages > Components > Directional Control Valves Hydraulics Directional Control Valves 1 4/3-way proportional valve The valve is used to control the direction and quantity of hydraulic volume flows. – Locking device position, de-energized – Actuation: Proportional solenoid – Operating pressure: 6 MPa (60 bar) – Maximum permissible pressure: 12 MPa (120 bar) – Valve connection diagram, hydraulic ISO/DIN 4401 size 02 – Low-leakage, self-sealing coupling nipples – Operating voltage: 24 V DC – Nominal current: 800 mA – Connection, electrical: 4 mm safety sockets – Quick-action mounting system Quick-Fix Order no. 544350 2 Pressure balancer (Proportional flow control valve) The pressure balancer expands the 4/3-way proportional valve (order no. 544350) into a proportional flow control valve. This vertical stacking valve is mounted between the base plate and the proportional directional control valve. – Operating pressure: 6 MPa (60 bar) – Maximum permissible pressure: 12 MPa (120 bar) – Valve connection diagram, hydraulic ISO/DIN 4401 size 02 Order no. 159351 3 6/3-way proportional hand lever valve The valve is used to control hydraulic volume flows, both in terms of direction and quantity. Serial, parallel, and tandem circuits can be realized by linking several valves. – Mid-position, spring-centered, P1->T1, P2T2AB locked – Actuation: Manual – Operating pressure: 6 MPa (60 bar) – Maximum permissible pressure: 12 MPa (120 bar), T2 only briefly 6 MPa (60 bar) – Low-leakage, self-sealing coupling nipples – Quick-action mounting system Quick-Fix Order no. 572141 1 4 3 4 Load sensing control block Two proportional directional control valves with input pressure balancer for load sensing controls (pressure and volume flow adjustment). Suitable for pilot control unit, 2x 2-channel (Order no. 572147). – Locking center position, spring-centered (closed center) – Actuation: Hydraulic and manual (hand lever) – Operating pressure: 6 MPa (60 bar) – Pilot pressure: up to 3.5 MPa (35 bar) – Maximum permissible pressure: 12 MPa (120 bar) – Low-leakage, self-sealing coupling nipples – Open connection nipple for unpressurized return flow (T) – Quick-action mounting system Quick-Fix Order no. 572144 5 Steering valve (Orbitrol) The rotary slide valve is used for hydrostatic steering systems. When the steering wheel is turned, the steering unit measures a quantity of oil to the right or left that is proportional to the steering wheel rotation. The excess volume flow is discharged via E and fed to another consumer (Power Beyond). – Without load feedback (non-reaction) – Open center (for fixed displacement pump) – Actuation: Manual (steering wheel) – Operating pressure: 6 MPa (60 bar) – Maximum permissible pressure: 12 MPa (120 bar) – Low-leakage, self-sealing coupling nipples – Open connector plug for unpressurized return flow (T) – Quick-action mounting system Quick-Fix Order no. 572146 2 5
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