FLOW CONTROLS
FD56-45 Flow Divider/Combiner . . . Heavy Duty,
DESCRIPTION
A heavy duty, multifunction, screw-in, cartridge-style, spool-type flow divider/combiner.
It provides pressure-compensated proportional division of inlet flow or combining of
two return flows regardless of system operating pressure. The FD56-45 has an orifice
at Port 1 to facilitate removal of the spring ring if needed.
OPERATION
In the dividing mode, the FD56-45 will divert input flow from 3 to 2 and 4, based
on the ratio specified, regardless of operating pressure. When the flow direction 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)
Pressure Drop: 24 bar (350 psi) at max inlet flow
Flow Options, Dividing/Combing (Ratio: 50:50)
Input Flow: 25-98 lpm (6.5-26 gpm) Model Code: 44
Input Flow: 32-128 lpm (8.5-34 gpm) Model Code: 66
Input Flow: 57-167 lpm (15-44 gpm) Model Code: 88
Input Flow: 68-197 lpm (18-52 gpm) Model Code: 99
Flow Accuracy: 10% of maximum rated flow for Models 44 & 66; 15% for 88 & 99
Synchronizing Flow: Approximately 10% of maximum inlet flow
Temperature: -40 to 100°C (-40 to 212°F) with Buna N seals; -26 to 204°C (-15 to
400°F) with fluorocarbon seals; -54 to 107°C (-65 to 224°F) with 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 16 size 4-way bodies can be used with this product with Port 1
plugged. See page 8.016.1 for special flow divider bodies.
Cavity: VC16-4; See page 9.116.1
Cavity Tool: CT16-4X; See page 8.600.1
Seal Kit: SK16-4X-MMM; See page 8.650.1
ISO SYMBOL
PERFORMANCE
(Cartridge Only)
5.636.1
53.0/14
45.4/12
37.9/10
30.8/8
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)
(FD56-45 Model 44 Dividing Mode) FL4 FL2
32 cSt/150 sus oil at 40°C
22.7/6
7.6/2
15.1/4
0
Note: This new FD56-45 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. OEMs 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: 0.38 kg. (0.83 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
required for operation over 207 bar
(3000 psi). Aluminum bodies are
available for lower pressure opera-
tion. FD-type bodies recommended
but a standard 4-way body may
also be used with Port 1 plugged.
See page 8.016.1.
MATERIALS TO ORDER
FD56-45
- __ __ __ - __ - __ __
Dividing/Combining Ratio
44 50:50 rated @ 25-98 lpm
(6.5-26 gpm) input
66 50:50 rated @ 32-128 lpm
(8.5-34 gpm) input
88 50:50 rated @ 57-167 lpm
(5-44 gpm) input
99 50:50 rated @ 68-197 lpm
(18-52 gpm) input
FD56-45
5.636.2
DIMENSIONS
Multifunction
®
HYDRAFORCE
HYDRAFORCE
.com
®
Seals
N Buna N (Std.)
V Fluorocarbon
P Polyurethane (
Required for
operation over 240 bar/3500 psi)
INSTALLATION TORQUE:
Body Dimensions shown are
for either Ductile Iron or Aluminum
98–102 ft-lbs (133–138 Nm)
Ported Bodies
Cartridge Only 0
SAE 10 (all ports) 10TD
SAE 12 (all ports) 12TD
SAE 16 (all ports) 16TD
SAE 16 port 3;
SAE 12 ports 2 & 4 16DD
3/4 in. BSP* (all ports) 6BD
1 in. BSP* (all ports) 8BD
1 in. BSP* port 3;
3/4 in. BSP* ports 2 & 4 8FD
*BSP Body; U.K. Mfr. Only
Blue rectangles are links to other catalog pages.
