Created on 12/14/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
LKFO
Vent-to-close, spring biased open, unbalanced poppet logic element
SERIES 2 / CAPACITY: 120 L/min. / CAVITY: T-2A
These unbalanced, pilot-to-open logic valves are 2-way switching elements that are spring biased open. Pressure
at either work port 1 or 2 will oppose the spring and tend to close the valve while pressure at port 3 will tend to
open it. The force generated at port 3, minus the spring force, must be greater than the sum of the forces acting at
port 1 and port 2 for the valve to close. NOTE: The pilot area (port 3) is 1.8 times the area at port 1 and 2.25 times
the area at port 2.
TECHNICAL DATA
Cavity T-2A
Series 2
Capacity 120 L/min.
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 cc/min.@70 bar
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
Valve Hex Size 28,6 mm
Valve Installation Torque 61 - 68 Nm
Seal kit - Cartridge Buna: 990202007
Seal kit - Cartridge Polyurethane: 990002002
Seal kit - Cartridge Viton: 990202006
Model Weight 0.21 kg.
(X)CONTROL
X Not Adjustable
(D)MINIMUM PILOT PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
snhy.com/
LKFO
TECHNICAL FEATURES
Model Code Example: LKFOXDNCONFIGURATION OPTIONS
Created on 12/14/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
These valves have positive seals between port 2 and the pilot area.
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).
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
