 2019 Sun Hydraulics 1 of 3

MODEL

LKJCZ

Pilot-to-open, spring-biased closed, unbalanced poppet logic element with

position switch

SERIES 4 / CAPACITY: 320 L/min. / CAVITY: T-19A

CONFIGURATION

D Minimum Pilot Pressure 50 psi (3,5 bar)

N Seal Material Buna-N

NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.

These unbalanced poppet, logic valves are 2-way switching elements that are spring-biased closed. Pressure at

either work port 1 or 2 will further bias the valve to the closed position while pressure at port 3 will tend to open it.

The force generated at port 3 must be greater than the sum of the forces acting at port 1 and port 2 plus the spring

force for the valve to open. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and 2.25 times the area at

port 2.

This valve incorporates a position switch to provide confirmation that the valve is closed.

TECHNICAL DATA

Cavity T-19A

Series 4

Capacity 320 L/min.

Maximum Operating Pressure 350 bar

Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.

Pilot Volume Displacement 4,9 cc

Pilot Passage into Valve 2,3 mm

Area Ratio, A3 to A1 1.8:1

Area Ratio, A3 to A2 2.25:1

Transition leakage at 110 SUS (24 cSt) 30 cc/min.@70 bar

Valve Hex Size 41,3 mm

Valve Installation Torque 474 - 508 Nm

Seal kit - Cartridge Buna: 990019007

Seal kit - Cartridge Polyurethane: 990019002

Seal kit - Cartridge Viton: 990019006

Model Weight 1.54 kg.

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LKJCZ

 2019 Sun Hydraulics 2 of 3

(D)MINIMUM PILOT PRESSURE

D 50 psi (3,5 bar)

(N)SEAL MATERIAL

N Buna-N

V Viton

SWITCH SPECIFICATIONS

Supply Voltage 20-30 VDC

Operating Temperature Range -25 to 80 °C

Vibration ≥ 50g, 0-500 impulses/sec

Shock >50 g, 1ms

Reverse Polarity Protection Yes

Maximum Output Load ≤ 400 mA, Duty Ratio 100%

Short Circuit Protection Yes, Load Short Unlimited

Turn On Time ≤ 25 ms

Hysteresis ≤ .002 in.

Thermal Shift - 0 to 80 °C ≤ ± 0,1 mm

EMC DIN EN 61000-6-1/2/3/4

Connector M12 X 1 (4) Pin

Connector Environment Rating IP65

TECHNICAL FEATURES

The position switch in this valve provides confirmation that the valve is closed.

These valves have positive seals between port 2 and the pilot area.

This cartridge is supplied as a sealed, factory set unit and is not field serviceable. Any tampering will violate the product warranty.

When torquing this cartridge into its cavity, a crow's foot wrench or similar will be required since the position switch precludes the use of a deep socket wrench.

Because these valves are unbalanced, operation is pressure dependent. Opening and closing of the poppet are functions of the force balances on three areas: Port

1 = 100%, Port 2 = 80%, and the Pilot Area = 180%.

These valves are pressure responsive at all ports, therefore it is essential to consider all aspects of system operation through a complete cycle. Pressure changes

at any one port may cause a valve to switch from a closed to an open position, or vice versa. All possible pressure changes in the complete circuit must be

considered to assure a safe, functional system design.

All ports will accept 5000 psi (350 bar).

Position switch is CE approved.

Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge

machining variations.

PERFORMANCE CURVES

Model Code Example: LKJCZDNCONFIGURATION OPTIONS

 2019 Sun Hydraulics 3 of 3

RELATED MODELS

LKJC Pilot-to-open, spring-biased closed, unbalanced poppet logic element