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2025 Sun Hydraulics 1 of 2
MODEL
DKHR8DKHR8
Normally closed, balanced poppet, logic element with integral T-
8A control cavity - vent-to-open
SERIESSERIES 3 / 3 / CAPACITY:CAPACITY: 240 L/min. / 240 L/min. / CAVITY:CAVITY: T-23A T-23A
NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.
This is a normally closed, balanced poppet, switching element with an integral T-8A control
cavity. With a 2-way valve in the closed position installed in the T-8A control cavity, the
poppet remains closed. Opening the 2-way valve shifts the poppet to the open position,
provided there is sufficient pressure at port 3.
TECHNICAL DATATECHNICAL DATA
Cavity T-23A
Series 3
Capacity 240 L/min.
Maximum Operating Pressure 350 bar
Minimum Pilot Pressure Required to Shift Valve 20 bar
Control Pilot Flow See Performance Data
Maximum Valve Leakage at 110 SUS (24 cSt) 0,7 cc/min.@350 bar
Pilot Control Cavity T-8A
Pilot Control Valve Installation Torque 27 - 33 Nm
Pilot Control Valve Hex Size 22,2 mm
Valve Hex Size 31,8 mm
Valve Installation Torque 203 - 217 Nm
Seal kit - Cartridge Buna: 990023007
Seal kit - Cartridge Polyurethane: 990023002
Seal kit - Cartridge Viton: 990023006
Model Weight 0.64 kg.
sunhydraulics.com/model/
DKHR8
Compound cartridge (pilot and main stage) assembly information is provided for reference only. Cartridges must be ordered
separately and assembled at point of use.
NOTESNOTES
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2025 Sun Hydraulics 2 of 2
(H)(H)
MINIMUM CONTROL PRESSUREMINIMUM CONTROL PRESSURE
HH 300 psi (20 bar)
(N)(N)SEAL MATERIALSEAL MATERIAL
NN Buna-N
VV Viton
TECHNICAL FEATURESTECHNICAL FEATURES
Unique balanced construction provides predictable switching with 5000 psi (350 bar) at port 1 and port 2. Switching will only occur
when both a minimum pilot pressure of 400 psi (30 bar) is present and pilot control valve is open.
These valves are hydraulically balanced between port 1 and port 2.
Port 1 and port 2 are fully sealed from port 3 and port 4. Ports 3 and 4 are positively sealed.
Any backpressure at the drain port is directly additive to the required pilot pressure for reliable operation.
Leakage rate between port 1 and port 2 is very low, typically less than 10 drops/min. at 5000 psi (0,7 cc/min at 350 bar).
Valve will reseat when the pilot pressure falls below 145 psi (10 bar).
NOTE: With the -8 control option, the main stage valve should first be installed to the correct torque value. The T-8A pilot control
valve should then be installed into the main stage valve to its required torque value.
The -8 control option allows the pilot control valve to be incorporated directly into the end of the logic cartridge via the T-8A cavity.
These pilot control cartridges are sold separately and include electro-proportional, solenoid, air pilot, and hydraulic pilot operation.
See Pilot Control Cartridges.
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 CURVESPERFORMANCE CURVES
RELATED MODELSRELATED MODELS
DKHR Normally closed, balanced poppet, logic element - vent-to-open
Model Code Example: DKHR8ArrayModel Code Example: DKHR8ArrayCONFIGURATION OPTIONSCONFIGURATION OPTIONS
