FLOW CONTROLS
FDC16 Flow Divider/Combiner
DESCRIPTION
A specialized flow divider/combiner valve manifold, commonly applied in hydraulic
motor drive applications with uneven pressure loads caused by steering or ground
conditions. This valve/manifold assembly uses the FD56-45 cartridge valve;
see page 5.636.1.
OPERATION
In the dividing mode, the FDC16 will divert input flow from valve port 3 (V) to
ports 2 (C2) and 4
(C1) based on the ratio specified, while pressure at 2 and 4
remains relatively equal. If a pressure differential develops, fluid will be transfered
to the lower pressure port from the higher pressure port via an internal body orifice:
4
to 2 or 2 to 4.
In the combining mode, the internal orifice will serve to equalize load pressures,
preventing combiner spool lock-up.
FEATURES
• Hardened parts for long life.
• Quiet, modulated response.
RATINGS
Operating Pressure: 207 bar (3000 psi) with aluminum body;
345 bar (5000 psi) with ductile iron body and polyurethane seals.
Pressure Drop: 24 bar (350 psi) at maximum inlet flow.
Flow: See Performance Chart
Flow Options:
Code 44: 50:50 rated @ 25 to 98.4 lpm (6.5 to 26 gpm) input
Code 66: 50:50 rated @ 32 to 128 lpm (8.5 to 34 gpm) input
Code 88: 50:50 rated @ 57 to 167 lpm (15 to 44 gpm) input
Code 99: 50:50 rated @ 68 to 197 lpm (18 to 52 gpm) input
Other ratio options available; consult factory.
Balancing Orifice: 1.52 mm (0.06 in.) standard.
Standard Compensator Bias Spring: 2.07 bar (30 psid)
Flow Accuracy: 10% from 33-100% of rated flow
with approximately equal 2 and 4 port loads.
Temperature: -40 to 120°C (-40 to 248°F)
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
Seal Kit: for FD56-45 cartridge: SK16-4X-MMM; See page 8.650.1
SYMBOLS
USASI:
ISO:
PERFORMANCE (Cartridge Only)
5.706.1
34.5/500
27.6/400
20.7/300
13.8/200
6.9/100
37.9
10
75.8
20
113.6
30
FLOW lpm/gpm
PRESSURE DROP bar/psi
151.4
40
41.4/600
to 2 or : 44 Type — ;
66 Type - - -
32 cSt/150 sus oil at 40°C
3
4
HYDRAFORCE
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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 elasto-
mer back-ups standard.
Special FDC Ported Bodies:
Aluminum: Weight: 1.32 kg.
(2.93 lbs.) Anodized high-
strength 6061 T6 aluminum
alloy, rated up to 207 bar
(3000 psi).
Ductile Iron: Weight: 3.77 kg.
(8.32 lbs.) Rated up to
345 bar (5000 psi).
MATERIALS
TO ORDER
Special Alum. Ported Bodies
All Ports: SAE 12 12T
All Ports: SAE 16 16T
V: SAE 16; C1 & C2: SAE 12 16D
Seals
Buna N (Std.) N
Fluorocarbon V
Polyurethane P
Dividing/Combining Ratio
44 50:50 rated @ 25 to 98.4 lpm
(6.5 to 26 gpm) input
66 50:50 rated @ 32 to 128 lpm
(8.5 to 34 gpm) input
88 50:50 rated @ 57 to 167 lpm
(15 to 44 gpm) input
99 50:50 rated @ 68 to 197 lpm
(18 to 52 gpm) input
FDC16 - __ __ __ - __ - __ __ - 60
Balancing Orifi ce
60 1.52 mm (0.06 in.)
(Std.) non-removable
FDC16
5.706.2
DIMENSIONS
NOTE: Additional ratios, input fl ow
ranges, and balance orifi ces available
for OEM applications. Consult factory.
®
HYDRAFORCE
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Note: Polyurethane seals are required
for operation over 241 bar (3500 psi).
Blue rectangles are links to other catalog pages.
