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

SYMBOL:
ZL70-30 Valve symbol
DESCRIPTION
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.

OPERATION
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.

FEATURES
• Excellent linearity and hysteresis characteristics.
• Hardened spool and cage for long life.
• Optional coil voltages and terminations.
• Efficient wet-armature construction.
• Manual Override option.

RATINGS
Operating Pressure: Inlet: 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: 2 standard voltage ratings:
 Coil Voltage
Threshold Current
Max. Control Current
 12 VDC
250 ±100 mA
1400 ±100 mA
24 VDC 125 ±50 mA 750 ±50 mA
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: No restrictions; See page 9.020.1
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

RECOMMENDED ELECTRONIC CONTROLLERS
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



 

 

PERFORMANCE:

ZL70-30 Performance charts

 

DIMENSIONS:

ZL70-30 Valve Dimensions

 

MATERIALS:

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.

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.

 

ORDERING CHART:

ZL70-30 Ordering