Flow Control Valves

FD56-45 — Flow Divider / Combiner, Multi-Function, High Pressure
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FD56-45 Valve

FD56-45 Valve symbol
A heavy duty, multifunction, screw-in, cartridge-style, spool-type flow
divider/combiner. It provides pressure-compensated proportional divisio
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.

In the dividing mode, the FD56-45 will divert input flow from port 3 to ports 2 and 4,
based on the ratio specified, regardless of operating pressure. When the flow 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.

• Hardened parts for long life.
• Quiet, modulated response.
• Wide operating flow range.
• Synchronizing in dividing and combining modes.
• Floating cage — high installation torque.
• Industry-common cavity.

Operating Pressure: 345 bar (5000 psi) maximum
Flow Rate: 197 lpm (52 gpm) input maximum with model code 99
Flow Options:
   Input Flow: 98 lpm (26 gpm); Ratio: 50:50; Model Code: 44
   Input Flow: 128 lpm (34 gpm); Ratio: 50:50; Model Code: 66
   Input Flow: 167 lpm (44 gpm); Ratio: 50:50; Model Code: 88
   Input Flow: 197 lpm (52 gpm); Ratio: 50:50; Model Code: 99
Flow Accuracy: 10% from 25 to 100% of rated flow
Temperature: -40° to 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon seals;
   -54° to 107°C (-65°F to 225°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_4w for special flow divider bodies.
Cavity: VC16-4, Variation 'A'; See page 9.116.1_4w
Cavity Tool: CT16-4xx; See page 8.600.1
Seal Kit: SK16-4x-MMM; See page 8.650.1

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. OEM’s are encouraged to consider this newer, more robust and versatile
model for new applications.




FD56-45 Flow vs. Pressure



FD56-45 Valve Dimensions



Cartridge: Weight: 0.28 kg (0.61 lb);
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 operation. FD-type bodies recommended but a standard
4-way body may also be used with Port 1 plugged. See page 8.016.1_4w



FD56-45 Ordering