EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009H-290.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
PFRD/S-12 - Priority Flow Control
Spool Type, Load Sensing
76 L/min (20 USgpm) • 280 Bar (4000 psi)
Operation
This valve is used in the flow
control mode. Pump flow
from the valve inlet port 3
is delivered first to port 4
at a fixed rate; excess flow
is bypassed to port 2. The
valve maintains the controlled
flow to 4 regardless of inlet
pressure change or load
pressure changes at 2 or 4.
This valve is typically used
with open loop load sense
systems in steering and
braking circuits. The static
type is used for less difficult
applications where response
or circuit stability is not a
problem. The dynamic type is
used for difficult applications
where response or circuit
Pressure Drop
Cartridge only
stability are critical. The load
sense line connected to
port 5 should not exceed 2
Meters (6 Feet) in length.
Overpressure protection for
the circuits connected to ports
2 and 4 must be provided
by external relief valves. The
control pressure is determined
by assuring adequate inlet
pressure to the steering unit
and must be matched to the
steering unit’s required flow.
The control pressure must
be supplied to the valve as a
minimum inlet pressure. The
pressure at port 4 can vary
by 10% when the load at the
excess flow port 2 varies from
0 to maximum pressure.
Features
Hardened and ground working
parts to limit leakage and
extend service life. Robust
design with a 280 bar max
pressure rating.
Description
This is a load sense priority
flow regulator designed to
provide a controlled pressure
compensated flow on
demand. The valve is ideal
for steering or accumulator
charging circuits.
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) 280 bar (4000 psi)
Cartridge fatigue pressure (infinite life) 280 bar (4000 psi)
Rated inlet flow 76 L/min (20 USgpm)
Temperature range -40° to 120°C (-40° to 248°F))
Cavity C–12–5S
Fluids All general purpose hydraulic fluids such as:
MIL-H-5606, SAE 10, SAE 20 etc.
Filtration
Cleanliness code 18/16/13
Standard housing material Aluminum or steel
Weight cartridge only 0,36 kg (0.79 lb)
Seal kit 202914-921
Internal leakage 164cc/min (10 in
3
/min) @ 3000 PSID
Recommended L/S orifice 0.031" (not included in valve)
Performance Data
Note: Minimum inlet flow
should not be less than
1/4 of maximum inlet flow.
Minimum pressure drop
is determined by control
pressure.
Note: Port 1 unused, port
should be plugged.
Sectional View
Dynamic Signal (PFRD)
Static Signal (PFRS
2
5 (LS)
4 (CF)
2 (EF)
1
3 (P)
2
5 (LS)
4 (CF)
2 (EF)
1
3 (P)
1
2
3
4
5
(LS)
(CF)
(P)
(EF)
0
73
145
218
290
20
0
3010 40 50 60 70 80 90
5
10
15
20
Flow - USgpm
P to EF
Pressure drop psi
Flow - L/min
Pressure drop bar
5 15 2010
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 H-291.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
PFRD/S-12 - Priority Flow Control
Spool Type, Load Sensing
76 L/min (20 USgpm) • 280 Bar (4000 psi)
(3.40)
86.4
(1.31)
33.3
1 1/4" HEX
1 1/16"-1 2 UN-2A
1
2
3
4
5
LS
CF
P
EF
1
Function
PFRS - Priority flow regulator
Static signal type
PFRD - Priority ow regulator
Dynamic signal type
2
Size
12 - 12 size
3
Seal Material
U - Urethane (standard)
4
Valve Housing Material
O - Cartridge only
A - Aluminum
S - Steel (standard)
•
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).
Model Code
2 31
PFR*
12
U
5
***
6
***
4
*
7
00
Code Port Size Housing Number
Port 2, 3, 4 Port 5 Aluminium Steel
000 No Body – – –
10T SAE 10 SAE 4 4998820-001 4998821-001
12T SAE 12 SAE 4 4998820-002 4998821-002
04G 1/2" BSPP 1/4" BSPP 4998820-003 4998821-003
06G 3/4” BSPP 1/4" BSPP 4998820-004 4998821-004
*These model digits will not be stamped on the valve.
See section J for housing details.
5
Port Size
6
Control Pressure
PFRS options
055 - 55 psi (3.8 bar)
078 - 78 psi (5.4 bar)
100 - 100 psi (6.9 bar)
PFRD options
075 - 75 psi (5.2 bar)
110 - 110 psi (7.6 bar)
145 - 145 psi (10.0 bar)
7
Special Features
00 - None
(Only required if valve has special
features, omit if ("00")
Dimensions
mm (inch)
Cartridge Only
Basic Code
PFRD/S-12
Torque cartridge in housing
A - 81-95 Nm (60-70 ft lbs)
S - 102-115 Nm (75-85 ft lbs)
Note: Standard housings
include port 1, however for
most applications this port
must be blocked.
Installation Drawing (Steel)
– – –––
50.04
(1.970)
100.8
(3.97)
76.2
(3.00)
2 x 08.74
(0.344)
25
(0.99)
25.0
(0.99)
12.3
(0.49)
101.6
(4.00)
113.5
(4.47)
76.1
(3.00)
34.1
(1.34)
54
(2.13)
16.7
(0.66)
33.3
(1.31)
4
2
1
5
3
