Electro-Proportional Valves — Flow Control

ZL70-30 — Spool-Type, Bi-Directional, Normally Closed
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ZL70-30 Valve
U.S. Patent 6,167,906

ZL70-30 Valve symbol
A solenoid-operated, electrically-variable, 3-port, normally closed, pressure-compensated,
proportional flow control, spool-type, screw-in hydraulic cartridge valve. An internal compensator
spool provides compensated flow across the proportional orifice regardless of flow direction.

The ZL70-30 provides regulated flow from port 2 to port 3, or regulated flow from port 3 to port 2.
Port 1 should be blocked. Regulated flow is proportional to electric current applied to the solenoid.

Manual Override: To Engage: Turn clockwise approximately 1 turn to reach start point.
Continue another approximately 5 turns to full shift.
To Disengage: Turn counterclockwise approximately 6 turns until positive stop is found.

• Choice of two regulated flow ranges.
• Excellent linearity and hysteresis characteristics.
• Hardened spool and cage for long life.
• Optional coil voltages and terminations.
• Efficient wet-armature construction.
• Manual Override option.

Operating Pressure: 240 bar (3500 psi)
Regulated Flow: Range A: 0 to 20 lpm (0 to 5.3 gpm); Range B: 0 to 10 lpm (0 to 2.6 gpm)
Internal Leakage: 0.38 lpm (0.10 gpm) max. at zero current
Electrical: (with size 70 E-series and D-series coils)
Coil Voltage Valve Inductance (mH) Threshold
Current (mA)
Max Control
Current (mA)
E-Coil D-Coil
12 240 200 250 ± 100 1400 ± 100
24 700 600 125 ± 50 700 ± 50
Dither/PWM Frequency Range: 100 to 250 Hz
Temperature: -40° to 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with fluorocarbon seals
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
   7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: Install D-series coils with two O-rings above and below the coil. Install
   E-series coils with only one O-ring above the coil. Manual override options M and G
   require Coil Nut Kits. See part numbers below. See Cartridge Installation, page 9.020.1
   for cartridge, coil and coil retainer installation. To assure proper function, coil retainer
   must be installed.
Cavity: VC10-3; See page 9.110.1_3w
Cavity Tool: CT10-3X-XX; See page 8.600.1
Seal Kit: SK10-3X-MM; See page 8.650.1 for seal kit options and appropriate seals
   based on application temperature range.
Coil Nut Kits (for Manual Override Option G): 4001214; (for Option M): 420218

The EVDR Series controllers are recommended for use with most HydraForce
proportional valves. These newer electronic controllers are versatile, reliable,
and easily configured and customized for a wide range of applications.
See the EVDR Product Selection Guide.
For other Electronic Controllers, see page 2.001.1_pdf




ZL70-30 Performance charts



ZL70-30 Valve Dimensions



Cartridge: Weight: 0.32 kg (0.7 lb);
Steel with hardened work surfaces.
Zinc-plated exposed surfaces; Buna N
O-rings and polyester elastomer back-ups

Standard Ported Body: Weight: 0.59 kg
(1.3 lb); Anodized high-strength 6061 T6
aluminum alloy, rated to 207 bar (3000 psi);
Ductile iron bodies available; dimensions
may differ. See page 8.010.1_3w.

70-Size D-Coil: Weight each: 0.32 kg
(0.7 lb); Unitized thermoplastic encapsulated,
Class H high temperature magnetwire.
See page 3.200.1_70-size.

70-Size E-Coil: Weight each: 0.41 kg
(0.9 lb); Fully encapsulated with rugged
external metal shell. IP69K rated.
See page 3.400.1_70-size.



ZL70-30 Ordering