17
FRG Model Series – Application Data
Functional Symbol
General Information
This valve is used as a meter-in flow
control. It permits the pump to operate
at load pressure and provides precise,
adjustable control of flow rates in
hydraulic circuits. Some typical uses
include controlling the speed of work
spindles, and rates of travel of tool
heads or slides
The valve is temperature and pressure
compensated to reduce flow variation
with changes in oil temperature and in
pressure. An integral, adjustable relief
valve protects the system against
overloads.
Pump unloading can be accomplished
by opening the vent connection to tank,
or by closing the throttle – provided that
oil under pressure is not trapped in the
outlet port.
Application Guidance
Flow Adjustment
Adjust flow rate by rotating the dial. A
lettered (A through E) indicator marks
approximately four revolutions from full
closed to fully opened.
Maximum flow may be limited by the
addition of spacers to the throttle shaft
under the selector dial.
Number of
Spacers
Limit of Max. Flow
lpm (USgpm)
3 68–79 (18–21)
2 38–49 (10–13)
1 17–22,7 (4.5–6)
Use spacers – Part No. 211026
Pressure Adjustment
Adjust overload relief pressure by
turning the screw on the side of the
valve. Clockwise rotation increases
pressure; counterclockwise rotation
decreases pressure.
Proper adjustment will prevent
excessively high working pressure upon
pump or other equipment.
Tank Connection
Connect to tank. Any pressure at this
connection must be added to the
pressure setting.
Valve Locking
A locking screw prevents the selected
flow rate setting from being inadvertently
changed.
Interchangeability
The FRG–03–*–28–2* can be mounted
in place of the FRG–03–*–28–2*
models.
Ratings
Maximum Flow Capacity (based on oil
viscosity of 100 SUS @ 49C (120F)
106 lpm, 8833 ft
3
/min
(28 USgpm, 6468 in
3
/min)
Maximum Relief Valve Pressure
FRG-03–B–28–2* 69 bar (1000 psi). . .
FRG-03–C–28–2* 138 bar (2000 psi). .
FRG-03–F–28–2* 207 bar (3000 psi). .
Maximum Throttle Adjusting Torque
Required
Adjusting Torque Proportional to Outlet
Pressure 2,26 Nm @210 bar . . . . . . . . .
(20 in. lbs. @ 3000 psi)
NOTE: For consistent, satisfactory,
regulation of flow, minimum pressure at
the outlet port should be 6,2 bar (90
psi), and some fluid should always be
passing across the integral relief valve
to tank. The pump capacity should
therefore be slightly greater than the
maximum flow required. If 106 l/min (28
USgpm) of regulated flow is needed, the
pump capacity should be at least 125
l/min (33 USgpm), (19 l/min (5 USgpm)
to tank). For lesser maximum flows,
reduce the 19 l/min (5 USgpm) flow to
tank in proportion to the reduction in
maximum flow.
Pressure Drop Information
Minimum metered flow rates
Operating
Pressure
bar (psi)
Approximate
Minimum Flow
cm
3
/min (in
3
/min)
35 (500) 82 (5)
69 (1000) 164 (10)
103 (1500) 246 (15)
138 (2000) 327 (20)
172 (2500)
409 (25)
207 (3000) 491 (30)
Subplate and Bolt Kits
Valves, subplates and mounting kits
must be ordered separately.
For example:
One (1) FRG–03–B–28–2* Valve
One (1) FRGM–03Y–10 Subplate
One (1) BKFG-03-645 Bolt Kit
(Bolt length = 3 inch)
When a subplate is not used, a
machined pad (as indicated by the
subplate shaded area) must be flat
within 0.0127mm (0.0005 inch) and
smooth within 63 microinch. Mounting
bolts, when provided by the customer,
must be SAE grade 7 or better.
Maximum recommended mounting bolt
torque: 40 Nm (350 lb. in.)
Mounting bolts, when provided by a
customer, must be SAE grade 7,
or better.
Weight
Valve 7,7 kg (17 lbs.). . . . . . . . . . . . . . . .
Subplates
FRGM–03Y–10 3,1 (7.0). . . . . . . . . . . . .
FRGM–03Z–10 4,5 (10). . . . . . . . . . . . .
18
Model Code
3 51 2
1
2
Special Seals
Omit if not required
F3 – Special seals for use with
phosphate ester type fluids
Type
F – Flow control
R – Integral pressure control
G – Manifold or subplate mounting
Nominal Valve Size
03 – 3/8”
Adjustable Relief Valve Setting
B – 70 bar (1000 psi)
C – 138 bar (2000 psi)
F –210 bar (3000 psi)
Maximum Flow Capacity
28 – 106 lpm (28 USgpm)
3
4
6
4
Design Number
Subject to change. Installation
dimensions remain as shown for desi
g
numbers 20 through 29
6
5
19
Installation Dimensions
124
(4.88)
85,9
(3.38)
Inlet port “P”
50
(1.97)
Outlet port “C”
Revolution Indicator
132,6
(5.22)
101,6
(4.00)
84,6
(3.33)
6,35
(.25)
Dia.
71,3
(2.81)
63,5
(2.50)
Outlet pressure gauge
test connection
1/2 NPT
∅ 47,8
(1.88)
.41 Dia. Thru 15 (.59)
C’bore 7,9 (.31) Deep
4 places for mounting
Two rest pins furnished.
See subplate for locations.
Mounting surface
(Seals furnished)
Two keys furnished
6,35
(.25)
Dia.
124
(4.88)
Tank port “T”
Vent port
(Leave vent connection plugged
except when necessary to drop
system pressure and circulate
pump delivery to the tank).
61,9
(2.44)
53,8
(2.12)
30,2
(1.19)
Access hole covered
when unit is locked.
Upon turning key, lock
screw is accessible.
Loosen to change dial
setting.
11,1R
(0.44)
153,2
(6.03)
fully extended
∅ 6,35
(0.25)
6,35
(0.25)
0
4
8
12
16
20
24
28
AB
CDE
Revolution Indicator
Flow vs Revolution Indicator/Dial Position
Max. Flow, 3 spacers
Max. Flow, 2 spacers
Max. Flow,
1 spacer
Max. Flow,
No spacer
Clearance to remove key
Example: With 3 spacers, indicator will read “A”
and dial maximum will read between 5 and 9
15
30
45
61
76
91
106
Flow
l/min US gpm
FRG–03 Model Series
millimeter (inch)
20
Subplate
146,1
(5.75)
101,6
(4.00)
22,4
(0.88)
.375–16 UNC–2B Thd.
4 Places
14,2
(0.56)
124,0
(4.88)
168,0
(6.62)
103,12
(4.06)
7,1 (0.28) dia. – 7,8 (0.31) deep
2 places for rest pins
0.44 R
101,6
(4.0)
88,1
(3.47)
73,2
(2.88)
0.76
(0.03)
Inlet connection “P”
NOTE:
When the subplate is not used, a machined pad, as indicated by the shaded area on the subplate, must be provided for mounting.
The pad must be flat within 0.0127mm (0.0005 inch) and smooth within 63 microinch. Mounting bolts, when provided by the customer, must
be SAE grade 7 or better.
77,7
(3.06)
20,6
(0.81)
50,8
(2.00)
FRGM–03Z–10
17,0
(0.67)
81,0
(3.19)
81,0
(3.19)
21,3
(0.84)
23,1
(0.91) dia
1 inch NPTF thd. (from rear) 3 places
38,1
(1.5)
23,9
(0.94)
20,6
(0.81)
Tank connection “T”
Vent connection 7,9 (0.31) dia
thru 1/4” NPTF thd from rear
Installation Dimensions
millimeter (inch)
FRGM–03Y–10 Subplate
15,0
(0.59)
6,35
(0.25)
Outlet connection “C”
23 (0.91) dia.
through 3/4” NPTF thd.
(from rear) 3 places
10,3 (0.406) dia thru
15,0 (0.59) c’ bore
9,6 (0.38) deep
4 places for mounting
