Created on 03/04/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
LKHC
Pilot-to-open, spring biased closed, unbalanced poppet logic element
SERIES 3 / CAPACITY: 240 L/min. / CAVITY: T-17A
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 2,5 cc
Pilot Passage into Valve 1,50 mm
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Seal kit - Cartridge Buna: 990-017-007
Seal kit - Cartridge EPDM: 990-017-014
Seal kit - Cartridge Polyurethane: 990-017-002
Seal kit - Cartridge Viton: 990-017-006
(X)CONTROL
X Not Adjustable
(D)MINIMUM PILOT PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
E EPDM
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
snhy.com/LKHC
TECHNICAL FEATURES
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.
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
Model Code Example: LKHCXDNCONFIGURATION OPTIONS
Created on 03/04/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
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
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
RELATED MODELS
LKHCZ Pilot-to-open, spring biased closed, unbalanced poppet logic element with position switch
