MODEL
LOKD8
Vent-to-open, spring-biased closed, unbalanced poppet logic element with pilot
source from port 1 or 2 and integral T-8A control cavity
SERIES 4 / CAPACITY: 1100 L/min. / CAVITY: T-19AU
(D)CRACKING PRESSURE
D 50 psi (3,5 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.
This valve is an unbalanced, vent-to-open 2-way logic switching element with an integral pilot control cavity. It is
spring biased closed and incorporates an integral shuttle so that the higher of pressures at either port 1 or port 2
can be used as a pilot source. With a pilot 2-way valve in the closed position installed in the T-8A cavity, the logic
element will remain in the closed position. With the pilot valve open, the logic element will open providing there is a
sufficient combination of pressures to overcome the spring force. The force generated at port 3, plus the spring
force, must be greater than the sum of the forces acting at port 1 and port 2 for the valve to remain closed. 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-19AU
Series 4
Capacity 1100 L/min.
Maximum Operating Pressure 350 bar
Pilot Volume Displacement 7,7 cc
Area Ratio, A3 to A1 1.8:1
Area Ratio, A3 to A2 2.25:1
Pilot Control Cavity T-8A
Control Orifice Diameter 0,9 mm
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 1.13 kg.
sunhydraulics.com/model/
LOKD8
Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered separately and assembled at
point of use.
NOTES
Model Code Example: LOKD8DNCONFIGURATION OPTIONS