
2
www.sunhydraulics.com
FLeX Series
z All FLeX Series valves incorporate the Sun oating-style construction to minimize the possibility of internal parts
binding due to excessive installation torque and/or cavity/cartridge machining variations.
z FLeX Series proportional valves are fully compatible with the XMD Expandable Mobile Drivers from Sun.
z Designed and tested to exceed 10-million operational cycles at full rated pressure.
z Meets new NFPA test standard T2.6.1 R2014 for fatigue and burst pressure ratings.
z Improved linearity and resolution over similar competing valves.
z Designed using CFD uid simulation for optimized geometries.
z For optimum performance, an amplier with current feedback and adjustable dither (80 - 250 Hz) should be
used. Capacities rated at 200-psi (14-bar) dierential and maximum rated coil current.
z Depending on circuit requirements, a reverse free ow check bypassing the compensator may be needed when
using an FPB* with an external compensator.
z Zinc-nickel plating standard for 1000-hour salt fog protection.
z The 5000 psi (350 bar) valves can be used with 740 Series high-power and 747 Series hazardous location coils.
z The 3000 psi (210 bar) valves can be used with 740 Series low-power and 747 Series hazardous location coils.
z A wide variety of coil termination and voltage options are available, with and without surge protection. See the
CONFIGURATION section.
z Coil connector options oer ratings up to IP69K. See individual coil product pages for details.
TECHNICAL FEATURESS
FPB*
PILOTOPERATED ELECTRO
PROPORTIONAL THROTTLE VALVE
TECHNICAL FEATURES
2
1
The 2/2 proportional poppet valves are pilot operated. They comprise a hex body
(3), solenoid with coil (2), poppet (5), dart (4), coil nut (1), ball (6), pin (7), and two
springs (8) for the FPBG and FPBF, and one spring (8) for the FPBJ and FPBI .
FPBG, FPBF, FPBD, and FPBE
Function: When de-energized, the dart (4) rests
on the poppet (5) which in turn rests on the sleeve
seat (9). In this condition, ow is blocked from 2 to
1 but will free ow from 1 to 2. When energized,
the dart lifts from the poppet proportional to the
coil current. The poppet then follows the dart and
lifts from the seat, opening ow from 2 to 1.
If the FPBF or FPBD is open and ow is routed 1
to 2, the valve may auto close and only pilot ow
will pass from 1 to 2. For the FPBG or FPBE, the
check valve (6 & 7) at the nose of the poppet will
allow free ow 1 to 2 whether the valve is open or
closed.
FPBJ, FPBI, FPBM and FPBN
Function: When de-energized, the dart (4) and
poppet (5) are held away from the sleeve seat (9)
by the spring (8), opening ow from 2 to 1. When
energized, the dart pushes into the poppet seat
proportional to the coil current. As the dart pushes
against the spring, the poppet pushes into the
sleeve seat, closing the valve. Flow is then blocked
from 2 to 1 but can free ow from 1 to 2.
If the FPBI or FPBM is open and ow is routed from
1 to 2, the valve may auto close and only pilot ow
will pass from 1 to 2. For the FPBJ or FPBN, the
check valve (6 & 7) at the nose of the poppet will
allow free ow 1 to 2 whether the valve is open or
closed.
PORT
1
PORT
2
PORT
1
PORT
2
NORMALLY CLOSED
NORMALLY OPEN
3
3
4
4
5
5
6
6
7
7
8
8
9
9