EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009H-260.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
PFR12-12 - Flow Regulator
Adjustable, priority type, pressure compensated
45 L/min (12 USgpm) • 350 bar (5000 psi)
Description
These valves are priority flow
regulators. The flow (and
actuator speed) will be largely
independent of the load and
the pressure conditions.
If used to regulate flow from
a fixed supply, for example
a standard gear or piston
pump, the valve will pass the
required flow and any surplus
flow will be diverted to the
bypass port. The bypass flow
may be used for a secondary
circuit whether the secondary
pressure requirement is higher
or lower than the regulated
pressure.
The valve inlet pressure will
be approximately 7 bar (100
psi) more than the regulated
or bypass pressure, whichever
is higher.
Operation
Inlet flow passes through the
fixed orifice and the radial
holes in the spool/sleeve
assembly then out of the
regulated port. The pressure
drop across the orifice is
sensed at each end of the
spool, producing a force
which, at the required flow
rate, overcomes the spring
force. The resultant movement
of the spool regulates the flow
by opening the radial valve
ports to the bypass port and
closing the regulated flow
ports.
The valve will pass flow in
the return direction but this
is restricted by the flow path
through the control orifice.
Features
Cartridge construction gives
versatility of application. A
valve may be fitted into a
line body, a custom designed
Hydraulic Integrated Circuit or
directly into a cylinder or other
actuator. Leakproof adjust
screw gives easy, accurate
adjustment to required flow
setting. Hardened and ground
working parts give accurate
flow control and long working
life.
Sectional View
Back pressure - psi
0 1000 2000 3000 4000 5000
Priority flow rate - USgpm
(105 SUS oil @ 120
0
F)
15
10
5
0
25
20
Priority flow rate - L/min
(21,8 cSt oil @ 49
0
C)
0
20
40
60
80
100
Back pressure - bar
0 70 140 210 275 350
A
A
B
B
Ratings and Specifications
Performance data is typical with fluid at 21,8 cSt (105 SUS) and 49° C (120° F)
Typical Application pressure (all ports) 350 bar (5000 psi)
Cartridge fatigue pressure (infinite life) 350 bar (5000 psi)
Rated flow Maximum inlet flow 114 L/min (30 USgpm)
Maximum regulated flow 45 L/min (12 USgpm)
Flow regulation accuracy 0,4-1,9 L/min (0.1-0.49 USgpm) ±20%
1,9-7,5 L/min (0.5-1.99 USgpm) ±15%
7,6-37,8 L/min (2.0-12.0 USgpm) ±10%
Factory set maximum priority flow rate accuracy under standard test conditions and within the above ranges
Temperature range -40° to 120°C (-40° to 248°F)
Cavity C-12-3
Fluids All general purpose hydraulic fluids such as:
MIL-H-5606, SAE 10, SAE 20, etc.
Filtration 18/16/13
Standard housing materials Aluminum or Steel
Weight cartridge only 0,32 kg (0.70 lb.)
Seal kit 9900171 (Buna-N)
9900172 (Viton
®
)
Viton is a registered trademark of E.I. DuPont
Typical Flow Regulation
Performance Data
A - Port 3, priority (regulated outlet) pressurized.
B - Port 2, (bypass outlet) pressurized.
1
3
2
3
2
1
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 H-261.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
“K” Adjustment
“S” Adjustment
“C” Adjustment
22.15-22.19
(.872-.874)
23.73-23.77
(.934-.936)
68.48
(2.696)
87.23
(3.434)
“1”
“3”
“2”
83.95
(3.305)
18.9 (.75)
Hex
1-1/4”
Hex
1-1/16-12-UN-2A
PFR12-12 - Flow Regulator
Adjustable, priority type, pressure compensated
45 L/min (12 USgpm) • 350 bar (5000 psi)
Code Port Size Housing Number - Body Only
Aluminum
Fatigue rated Steel
A4G 1/2” BSPP 02-161817
A6G 3/4” BSPP 02-161816
A10H SAE 10 02-160642
A12H SAE 12 02-160646
S4G 1/2” BSPP 02-169815
S6G 3/4” BSPP 02-169814
S10T SAE 10 02-161070
S12T SAE 12 02-169816
See section J for housing details.
Dimensions
mm (inch)
Model Code
1 Function
PFR12 - Priority flow
regulator
2 Size
12 - 12 Size
3 Seals
Blank - Buna-N
V - Viton
4 Adjustment
C - Cap
K - Knob
S - Screw
6 Factory set ow rate,
nominal
(Specify in USgpm)
Range 0,38-37,8 L/min
(0.1-10.0 USgpm)
7 Special features
00 - None
(Only required if valve has special
features, omitted if “00.”)
PFR12 12 (V) * ** *.* 00
1 2 3 4 5 6 7
5 Port Size
0 - Cartridge only
WARNING
Aluminum housings
can be used for
pressures up to 210 bar (3000
psi) Steel housings must be
used for operating pressures
above 210 bar (3000 psi).
•
Note: Torque cartridge in alu-
minum housing to 81-95 Nm
(60-70 ft. lbs)
Note: Torque cartridge in steel
housing to 102-115 Nm (75-85
ft. lbs)
Cartridge Only
Basic Code
PFR12-12
Installation Drawing (Steel)
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