FLOW CONTROLS
FD52-45 Flow Divider/Combiner . . . Heavy Duty,
DESCRIPTION
A heavy duty, multifunction, screw-in, cartridge-style, spool-type flow
divider/combiner valve. It provides pressure-compensated proportional division of
inlet flow or combination of two return flows, regardless of system operating pressure
conditions. The valve provides synchronizing flow in dividing and combining modes.
OPERATION
In the dividing mode, the FD52-45 will divert input flow from port 3 to ports 2 and 4,
based on the ratio specified, regardless of operating pressure. When the flow direc-
tion is reversed, the valve will combine flows from 2 and 4 to port 3. Synchronizing
flow is provided in both the dividing and combining modes at "bottomed" conditions in
cylinder applications and at "stalled" conditions in motor applications.
FEATURES
• Hardened parts for long life. • Quiet, modulated response.
• Wide operating flow range. • Industry common cavity.
• Synchronizing in dividing and combining modes.
• Floating cage — high installation torque.
RATINGS
Operating Pressure: 345 bar (5000 psi)
Flow Options (Ratio 50:50)
Input Flow: 15-60 lpm (4-16 gpm); Model Code: 44
Input Flow: 23-90 lpm (6-24 gpm); Model Code: 66
Input Flow: 50-106 lpm (8-28 gpm); Model Code: 88
Flow Accuracy:
10% of inlet flow for Models 44 and 66; 15% of inlet flow for Model 88.
Temperature: -40 to 100°C (-40 to 212°F) for Buna N seals; -26 to 204C (-15 to
400F) for fluorocarbon seals; -54 to 107°C (-65 to 225°F) for polyurethane seals.
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 can be used with this product with Port 1
plugged. See page 8.012.1 for special flow divider bodies.
Cavity: VC12-4; See page 9.112.1
Cavity Tool: CT12-4X; See page 8.600.1
Seal Kit: SK12-4X-MMM; See page 8.650.1
ISO SYMBOL
PERFORMANCE
(Cartridge Only)
5.634.1
37.9/10.0
30.8/8.0
22.7/6.0
15.1/4.0
138
2000
207
3000
69
1000
275
4000
345
5000
DIFFERENTIAL PRESSURE (bar/psi)
FLOW PER PORT (lpm/gpm)
Flow vs. Differential Pressure (P4-P2)
(FD52-45 Model 44 Dividing Mode) FL4 FL2
32 cSt/150 sus oil at 40°C (104°F)
7.6/2.0
1
2
3
4
Note: This new FD52-45 flow divider incorporates the features of the older
FDxx-40, FDxx-41 and FDxx-42 flow dividers in one product. It is designed
to supersede the older models. OEM’s are encouraged to consider this
newer, more robust and versatile model for new applications.
HYDRAFORCE
.com
®
Blue rectangles are links to other catalog pages.
Cartridge: Weight: 0.24 kg.
(0.53 lbs.) Steel with hardened
work surfaces. Zinc-plated
exposed surfaces. Buna N O-rings
and polyester elastomer back-ups
standard.
Ported Body: Ductile iron body re-
quired for operation over 207 bar
(3000 psi). Aluminum bodies are
available for lower pressure
operation. FD-type bodies
recommended but a standard
4-way body may also be used with
Port 1 plugged. See page 8.012.1.
MATERIALS TO ORDER
FD52-45
- __ __ __ - __ - __ __
Flow Options (50/50 Ratio)
44 15-60 lpm (4-16 gpm)
66 23-90 lpm (6-24 gpm)
88 30-106 lpm (8-28 gpm)
FD52-45
5.634.2
DIMENSIONS
Multifunction
®
HYDRAFORCE
HYDRAFORCE
.com
®
Seals
N Buna N (Std.)
V Fluorocarbon
P Polyurethane (
Required for
operation over 240 bar/3500 psi)
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
MILLIMETRE
INCH
PORT ~ IS NOT USED
Body Dimensions shown
are for either Ductile Iron or Aluminum
1.98
50.3
2.00
50.8
4.00
101.6
0.39
9.5
INSTALLATION TORQUE:
73–77 ft-lbs (99–104 Nm)
Ported Bodies
Cartridge Only 0
SAE 8 8TD
SAE 10 10TD
SAE 12 12TD
1/2 in. BSP* 4BD
3/4 in. BSP* 6BD
*BSP Body; U.K. Mfr. Only
Blue rectangles are links to other catalog pages.
