FLOW CONTROLS
FD12-41 Flow Divider/Combiner, Cylinder Synch.
DESCRIPTION
A screw-in, cartridge-style, spool-type fl ow divider/combiner. Optional fl ow dividing/
combining ratios are maintained regardless of system operating pressure conditions.
OPERATION
In the dividing mode, the FD12-41 will divert input fl ow from port ➂ to ports ➁ and ➃,
based on the ratio specifi ed, regardless of operating pressure.
The cartridge will combine input fl ows from ports
➁ and ➃.
The FD12-41 is designed to allow fl ow to the opposite cylinder once the fi rst cylinder
has “bottomed” in the combining mode.
FEATURES
• Hardened parts for long life.
• Quiet, modulated response.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: 90.8 lpm (24 gpm) input max.
Flow Options:
Input Flow: 60.6 lpm (16 gpm); Ratio: 50:50; Model Code: 44
Input Flow: 75.7 lpm (20 gpm); Ratio: 50:50; Model Code: 55
Input Flow: 90.8 lpm (24 gpm); Ratio: 50:50; Model Code: 66
Standard Compensator Bias Spring: 2.07 bar (30 psid)
Flow Accuracy: 10% from 30–100% of rated fl ow
Temperature: -40 to 120°C
Filtration: See page 9.010.1
Fluids: Mineral-based or synthetics with lubricating properties at viscosities of
7.4 to 420 cSt (50 to 2000 sus); See Temperature and Oil Viscosity, page 9.060.1
Installation: No restrictions; See page 9.020.1
Note: Standard 12 size 4-way bodies should not be used with this product.
See page 8.012.3 for special fl ow divider bodies.
Cavity: VC12-4; See page 9.112.1 (Cavity Variation "A")
Cavity Tool: CT12-4XX; See page 8.600.1
Seal Kit: SK12-4X-MMM; See page 8.650.1
USASI/ISO:
5.613.1
PERFORMANCE (Cartridge Only)
34.5/500
27.6/400
20.7/300
13.8/200
6.9/100
30.3
8
45.4
12
15.1
4
60.6
16
75.7
20
90.8
24
FLOW lpm/gpm
PRESSURE DROP bar/psi
66 Type ; 55 Type ; 44 Type
32 cSt/150 ssu oil at 40°C
1
2
3
4
Note: This model will be superseded by the new FDxx-45 models, which
incorporate the features of the FDxx-40, FDxx-41 and FDxx-42 series
valves in one product. OEM’s are encouraged to consider the newer,
more robust and versatile FDxx-45 models for new applications:
FD50-45; see page 5.632.1
FD52-45; see page 5.634.1
FD56-45; see page 5.636.1
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SYMBOLS
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FD12-41
5.613.2
MATERIALS
Cartridge: Weight: 0.28 kg. (0.61 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Standard Ported Body: Weight:
1.50 kg. (3.30 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.012.1
TO ORDER
FD12-41 - __ __ __ - __ -__
Porting
Cartridge Only 0
SAE 10 10T
SAE 12 12T
See page 8.012.3 8D
See page 8.012.3 10D
Flow Options (50/50 Ratio)
44 16 gpm (60 lpm)
55 20 gpm (74 lpm)
66 24 gpm (90 lpm)
Seals
N Buna N (Std.)
V Fluorocarbon
Consult factory for other fl ow options.
DIMENSIONS
NOTE: Standard 12-size 4-way bodies
should not be used for fl ow dividers. See
special fl ow divider bodies, page 8.012.1
1
2
3
4
3.62
91.9
0.19
4.8
0.34
8.6
4.38
111.3
2.12
53.8
5.00
127.0
1.15
29.2
3.09
78.5
2
4
3
3.88
98.6
1.25
31.8
ACROSS FLATS
TORQUE: 30 ft-lbs
(40.6 Nm) max.
MILLIMETRE
INCH
PORT ➀ IS NOT USED
1.98
50.3
2.00
50.8
4.00
101.6
0.39
9.5
®
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