EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009H-310.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
PFRD/S-20 - Priority Flow Control
Spool type, load-sensing
230 L/min (60 USgpm) • 240 bar (3500 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.
0
50
7
14
100
150
200
250
10 20
75 151 227
30
Inlet flow (GPM)
Flow - L/min
40 50 60
Pressure drop psi
Pressure drop bar
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) 240 bar (3500 psi)
Cartridge fatigue pressure (infinite life) 240 bar (3500 psi)
Rated inlet flow 230 L/min (60 USgpm)
Temperature range -40° to 120°C (-40° to 248°F))
Cavity C–20–5S
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 0,86 kg (1.9 lbs)
Seal kit 02-187543
Internal leakage 164cc/min (10 in 3/min) @ 3000 PSID
Recommended L/S orifice 0.047" (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)
EATON Screw-In Cartridge Valves E-VLSC-MC001-E December 2009 H-311.A
An Eaton Brand
H
Where measurements are critical request certified drawings. We reserve the right to change specifications without notice.
PFRD/S-20 - Priority Flow Control
Spool type, load-sensing
230 L/min (60 USgpm) • 240 bar (3500 psi)
1
2
3
4
5
LS
CF
P
EF
1 5/8 -12 UN-2A
105,2 (4.14)
20,3 (.80)
1 7/8 HEX.
1
Function
PFRS - Priority flow regulator
Static signal type
PFRD - Priority ow regulator
Dynamic signal type
2
Size
20 - 20 size
3
Seal Material
U - Urethane (standard)
Model Code
2 31
PFR*
20
U
5
***
6
***
4
*
7
00
6
Control Pressure
PFRS options
080 - 80 psi (5.5 bar)
100 - 100 psi (6.9 bar)
PFRD options
085 - 85 psi (5.9 bar)
110 - 110 psi (7.6 bar)
7
Special Features
00 - None
(Only required if valve has special
features, omit if ("00")
5
Port Size
Code Port Size Housing Number
Port 2, 3, 4 Port 5 Aluminium Steel
000 No Body – – –
12T SAE 12 SAE 4 4998822-001 4998823-001
16T SAE 16 SAE 4 4998822-002 4998823-002
06G 3/4" BSPP 1/4" BSPP 4998822-003 4998823-003
08G 1" BSPP 1/4" BSPP 4998822-004 4998823-004
*These model digits will not be stamped on the valve.
See section J for housing details.
•
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).
Dimensions
mm (inch)
Cartridge Only
Basic Code
PFRD/S-20
Torque cartridge in housing
A - 130-155 Nm (95-115 ft lbs)
B - 160-180 Nm (120-135 ft lbs)
Note: Standard housings
include port 1, however for
most applications this port
must be blocked.
4
Valve Housing Material
O - Cartridge only
A - Aluminum
S - Steel (standard)
Installation Drawing (Steel)
– – –––
87.4
(3.44)
37.6
(1.48)
138.9
(5.47)
126.24
(4.970)
114.3
(4.50)
12.7
(0.50)
2 x 010.31
(0.406)
62.3
(2.45)
16.8
(0.66)
20.3
(0.80)
4
2
1
5
3
75
(2.97)
