Created on 03/11/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
LKDC
Pilot-to-open, spring biased closed, unbalanced poppet logic element
SERIES 1 / CAPACITY: 60 L/min. / CAVITY: T-11A
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.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 cc/min.@70 bar
Pilot Volume Displacement 0,33 cc
Pilot Passage into Valve 0,8 mm
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Seal kit - Cartridge Buna: 990-011-007
Seal kit - Cartridge Polyurethane: 990-011-002
Seal kit - Cartridge Viton: 990-011-006
(X)CONTROL
X Not Adjustable
(D)MINIMUM PILOT PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
/LH Mild Steel, Zinc-Nickel
snhy.com/
LKDC
TECHNICAL FEATURES
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).
Corrosion resistant cartridge valves are intended for use in corrosive environments and are identified by the model code suffix /AP for external stainless steel
components, or /LH for external zinc-nickel plated components. See the CONFIGURATION section for all options. For further details, please see the Materials of
Model Code Example: LKDCXDNCONFIGURATION OPTIONS
Created on 03/11/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
Construction page located under TECH RESOURCES.
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
