Created on 02/25/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 3
MODEL
LKFCZ
Pilot-to-open, spring biased closed, unbalanced poppet logic element with
position switch
SERIES 2 / CAPACITY: 80 L/min. / CAVITY: T-2A
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
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,07 cc/min.
Pilot Volume Displacement 0,98 cc
Pilot Passage into Valve 0,9 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
Seal kit - Cartridge Buna: 990-202-007
Seal kit - Cartridge EPDM: 990-202-014
Seal kit - Cartridge Polyurethane: 990-002-002
Seal kit - Cartridge Viton: 990-202-006
SWITCH SPECIFICATIONS
Supply Voltage 20-30 VDC
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.
Operating Temperature Range -25 to 80 °C
Thermal Shift - 0 to 80 °C ≤ ± 0,1 mm
EMC DIN EN 61000-6-1/2/3/4
Vibration ≥ 50g, 0-500 impulses/sec
snhy.com/
LKFCZ
Created on 02/25/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 3
Shock >50 g, 1ms
Connector M12 X 1 (4) Pin
Connector Environment Rating IP65
(D)MINIMUM PILOT PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
E EPDM
V Viton
TECHNICAL FEATURES
The position switch in this valve provides confirmation that the valve is closed.
Cartridges configured with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage
the seals.
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
RELATED MODELS
Model Code Example: LKFCZDNCONFIGURATION OPTIONS
