Pilot operated, pressure reducing/relieving main stage with integral T-8A
control cavity
Capacity:
80 gpm (320
L/min.)
Functional Group:
Products : Cartridges : Reducing/Relieving : Electro-Proportional : 3-Port, Integral T-8A Pilot Control Cavity
Model:
PPJB8
Product Description
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 Features
Maximum pressure at port 3 should be limited to 3000 psi (210 bar).
Pilot operated valves exhibit very low dead-band transition between
reducing and relieving modes.
Pressure at port 3 is directly additive to the valve setting at a 1:1 ratio
and should not exceed 3000 psi (210 bar).
Pilot operated valves exhibit exceptionally flat pressure/flow
characteristics, are very stable and have low hysteresis.
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.
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.
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.
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.
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
Incorporates the Sun floating style construction to minimize the
possibility of internal parts binding due to excessive installation torque
Download
pilot control cartridges are sold separately and include electro-
proportional, solenoid, air pilot, and hydraulic pilot operation. See Pilot
Control Cartridges.
and/or cavity/cartridge machining variations.
Technical Data
U.S. Units Metric Units
Cavity T-19A
Capacity 80 gpm 320 L/min.
Control Pilot Flow 15 - 20 in³/min. 0,25 - 0,33 L/min.
Maximum Operating Pressure 5000 psi 350 bar
Pilot Control Cavity T-8A
Series (from Cavity) Series 4
Valve Hex Size 1 5/8 in. 41,3 mm
Valve Installation Torque 350 - 375 lbf ft 475 - 500 Nm
Seal Kits - Cartridge Buna: 990-019-007
Seal Kits - Cartridge Viton: 990-019-006
Model Weight 2.27 lb. 1.03 kg.
PPJB-8WN
Minimum Control Pressure
Seal Material
Standard Options
D 25 psi (1,7 bar)
W 100 psi (7 bar)
Standard Options
N Buna-N
V Viton
Preferred
Options
Related Models
PPJB
Related Documents (opens in new window):
The T-8A Cavity Concept
Special Notes
No Special Notes Available for selected model.
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