ZL72-36 Proportional, Bi-Directional Flow Control, (ZL72-36)
A solenoid-operated, electrically-variable, three-port, pressure-compensated, spool-type, normally closed when de-energized, proportional, bi-directional, priority-type flow control valve.
Product Operation
The ZL72-36 provides priority regulated flow to port 1 with input at port 3, and bypass at port 2; or regulated flow from port 3 to port 2 with input at port 1 blocked. Regulated flow is proportional to electric current applied to the solenoid.
Application Notes: The ZL72-36 may be used for single-acting cylinder applications where lowering is provided by gravity force. There are no minimum load restrictions, provided the load is enough to overcome cylinder friction and other frictions in the system. At low load 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 (SV10-20 type) connected as shown on the circuit symbol and placed close to the ZL72-36 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.
Product Features
• Excellent linearity and hysteresis.
• Optional coil voltages and terminations.
• Hardened spool and cage for long life.
• Manual override option.
• Efficient wet armature construction.
Product Ratings
Maximum Operating Pressure: 240 bar (3500 psi)
Regulated Flow: 0-45 lpm (0-12 gpm)
Internal Leakage: 0.38 lpm (0.10 gpm) 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: VC12-3; See page 9.112.1;
Cavity Tool: CT12-3X-XX; See page 8.600.1
Seal Kit: SK12-3X-MM; See page 8.650.1
Threshold Current 300 ± 100 mA 150 ± 50 mA
Coil Voltage12 VDC24 VDC
Max. Control Current 1600 ± 100 mA 800 ± 50 mA
