ELECTRO-PROPORTIONAL VALVES—FLOW CONTROL

ZL70-36 Proportional, Bi-Directional Flow Control,

SYMBOLS

2.662.1

DESCRIPTION

A solenoid-operated, electrically-variable, three-port, pressure-compensated, spool-

type, normally closed when de-energized, proportional, bi-directional, priority-type

flow control valve.

OPERATION

The ZL70-36 provides priority regulated flow from port 1 to port 3 with bypass at

port 2; or regulated flow from port 3 to port 2 with port 1 blocked externally,

typically with a check valve (see symbol drawing). Regulated flow is proportional to

electric current applied to the solenoid.

Application Notes: The ZL70-36 may be used for single-acting cylinder applications

where lowering is provided by gravity force. The ZL 70-36 has no minimum load

restrictions provided the load is enough to overcome cylinder friction and other

frictions in the system. At low loads, the lowering speed can be slower than at heavier

load if pressure drop is less than the compensation value of the valve.

The hydraulic circuit must include a check valve and a poppet-type solenoid valve

(SV08-20 type) connected as shown on the circuit symbol and placed close to the

ZL70-36 valve, if possible in the same manifold. See Application Guide.

Operation of 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. • Efficient wet armature construction.

• Hardened spool and cage for long life. • Manual Override option.

• Optional coil voltages and terminations.

RATINGS

Maximum Operating Pressure: 240 bar (3500 psi)

Regulated Flow: 0–19 lpm (0–5.0 gpm); Input Flow: 0–25.5 lpm (0–6.5 gpm)

Internal Leakage: 0.38 lpm (0.10 gpm) maximum at zero current

Electrical: 2 standard voltage ratings

Temperature: -40 to 120°C with Buna N 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-L3; See page 9.110.1; Cavity Tool: CT10-3X-XX; See page 8.600.1

Seal Kit: SK10-3X-MM; See page 8.650.1

Threshold Current

300 ± 100 mA

150 ± 50 mA

Coil Voltage

12 VDC

24 VDC

Max. Control Current

1400 ± 100 mA

700 ± 50 mA

PERFORMANCE

U.S. Patent

6,116,263

CHECK VALVE

(TYPICAL)

USASI/ISO:

ABBREVIATED SYMBOL:

2010

PERCENT OF MAX. CONTROL CURRENT

FLOW lpm/gpm

40 5030 60 70 80 90 100

22.7/6

26.5/7

18.9/5

15.1/4

11.4/3

7.6/2

3.8/1

REGULATED FLOW vs. CURRENT

Input Flow 24.6 lpm/6.5 gpm; Port

➁ to Tank

➀ to ➂ 207 bar/3000 psi at Port ➂ ———

➂ to ➁ 240 bar/3500 psi at Port ➂ – – – –

12V Coil; 110 Hz PWM; 32 cSt/150 sus oil at 40°C

REGULATED FLOW vs. PRESSURE

Inlet Flow: 24.5 lpm/6.5 gpm; Port

➁ to Tank

➀ to ➂ ——— ➂ to ➁ — — —

12V Coil; 110 Hz PWM; 32 cSt/150 sus oil at 40C

PRESSURE bar/psi

103

1500

172

2500

242

3500

500

FLOW lpm/gpm

26.5/7

22.7/6

18.9/5

15.1/4

11.4/3

7.6/2

3.8/1

1.4

amp

1.0

amp

0.8

amp

0.5

amp

HYDRAFORCE

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Recommended Electronic Controllers:

See page 2.001.1 or our Electronics catalog.

Blue rectangles are links to other catalog pages.

Cartridge: Weight: 0.32 kg. (0.7 lbs.)

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 lbs.) 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

70-Size “D” Coil: Weight: 0.32 kg.

(0.7 lbs.) Unitized thermoplastic

encapsulated, Class H high

temperature magnet-wire.

See page 3.200.7.

70-Size “E” Coil: Weight: 0.41 kg.

(0.9 lbs.) Fully encapsulated with

rugged external metal shell.

IP69K rated. See page 3.400.13.

MATERIALS TO ORDER

ZL70-36

2.662.2

ZL70-36 __ - __ __ __ - __ - __ __ __ __

Option(s)

None

(Blank)

Manual Override M

Voltage

0 Less Coil

12 12 VDC

24 24 VDC

Normally Closed

Porting

Cartridge Only 0

SAE 6 6T

SAE 8 8T

DIMENSIONS

U.S. Patent 6,116,263

MILLIMETRE

INCH

1.06

27.0

ACROSS FLATS

TORQUE:

10–12 ft-lbs

(14–16 Nm)

1.13

28.6

ACROSS

FLATS

TORQUE:

27 ft-lbs max.

(36.7 Nm)

MANUAL

OVERRIDE

OPTION

4.41

111.9

3.77

95.7

2.13

54.1

3.39

86.2

0.75

19.1

2.84

72.1

3.25

82.6

1.64

41.6

0.28

7.13

2.00

50.8

0.25

6.35

1.74

44.1

1.25

31.8

1.25

31.8

2.50

63.5

Coils with internal

diode are available.

Consult factory.

HYDRAFORCE

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Terminations D-Coil

DS Dual Spades

DG DIN 43650

DL Leadwires (2)

DL/W Leads w/Weatherpak





Connectors

Terminations E-Coil

IP69K Rated

ER Deutsch DT04-2P

EY Metri-Pack

150

Seals

Buna N (Std.) N

Fluorocarbon V

Blue rectangles are links to other catalog pages.