Created on 03/17/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
PPFF8
Pilot operated, pressure reducing/relieving main stage with drilled piston orifice
and integral T-8A control cavity
SERIES 2 / CAPACITY: 80 L/min. / CAVITY: T-2A
This valve is a 3-way, 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, with a full flow relief function from port 1 to tank (port 3). The pilot
cartridge's setting determines the difference in pressure between reduced pressure (port 1) and the tank (port 3).
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Control Pilot Flow 0,16 - 0,25 L/min.
Pilot Control Cavity T-8A
Pilot Control Valve Installation Torque 27 - 34 Nm
Pilot Control Valve Hex Size 22,2 mm
Seal kit - Cartridge Buna: 990-202-007
Seal kit - Cartridge Polyurethane: 990-002-002
Seal kit - Cartridge Viton: 990-202-006
(W)MINIMUM CONTROL PRESSURE
W 100 psi (7 bar)
D 25 psi (1,7 bar)
(N)SEAL MATERIAL
N Buna-N
V Viton
snhy.com/
PPFF8
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.
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio and should not exceed 3000 psi (210 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.
Model Code Example: PPFF8WNCONFIGURATION OPTIONS
Created on 03/17/2016
c
2016 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
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.
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.
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
PPFF Pilot operated, pressure reducing/relieving valve with drilled piston orifice
