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2020 Sun Hydraulics 1 of 2
MODEL
PBJF8
Pilot-operated, pressure reducing main stage with drilled piston orifice and
integral T-8A control cavity
SERIES 4 / CAPACITY: 320 L/min. / CAVITY: T-19A
(W)MINIMUM CONTROL PRESSURE
W 100 psi (7 bar)
D 25 psi (1,7 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
NOTE: DATA MAY VARY BY CONFIGURATION. SEE CONFIGURATION SECTION.
This valve is a normally open modulating element that incorporates an integral pilot control cavity. The pilot control
cavity will accept any T-8A pressure control cartridge. The valve reduces a high primary pressure at the inlet (port 2)
to a constant reduced pressure at port 1. The pilot cartridge's setting determines the difference in pressure between
reduced pressure (port 1) and the drain (port 3).
TECHNICAL DATA
Cavity T-19A
Series 4
Capacity 320 L/min.
Factory Pressure Settings Established at blocked control port (dead headed)
Maximum Operating Pressure 350 bar
Control Pilot Flow 0,25 - 0,33 L/min.
Pilot Control Cavity T-8A
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 1.05 kg.
sunhydraulics.com/model/
PBJF8
Model Code Example: PBJF8WNCONFIGURATION OPTIONS
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2020 Sun Hydraulics 2 of 2
TECHNICAL FEATURES
These valves have the main stage orifice drilled into the piston rather than a staked-in orifice. This allows the valve to survive physically demanding applications.
Full reverse flow from reduced pressure (port 1) to inlet (port 2) may cause the main spool to close. If reverse free flow is required in the circuit, consider adding a
separate check valve to the circuit.
Pilot operated valves exhibit very low dead-band transition between reducing and relieving modes.
Pilot operated valves exhibit exceptionally flat pressure/flow characteristics, are very stable and have low hysteresis.
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 5000 psi (350 bar).
Maximum inlet pressure is determined by the bias spring. The D spring is tested with 2000 psi (140 bar) maximum differential pressure and the W spring is tested
with 5000 psi (350 bar) maximum inlet pressure.
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 relief 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 three-port pressure reducing and reducing/relieving cartridges are physically interchangeable (i.e. same flow path, same cavity for a given frame size). When
considering mounting configurations, it is sometimes recommended that a full capacity return line (port 3) be used with reducing/relieving cartridges.
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.
RELATED MODELS
PBJF Pilot-operated, pressure reducing valve with drilled piston orifice
