Flow Control Valves

FD52-45 — Flow Divider / Combiner, Multi-Function, High Pressure
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FD52-45 Valve

FD52-45 Valve symbol
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.

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 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: See Performance Chart.
Flow Options:
   Input Flow: 60.6 lpm (16 gpm); Ratio: 50:50; Model Code: 44
   Input Flow: 90.8 lpm (24 gpm); Ratio: 50:50; Model Code: 66
   Input Flow: 106 lpm (28 gpm); Ratio: 50:50; 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) 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 12 size 4-way bodies can be used with this product with Port 1 plugged.
   See page 8.012.1_4w for special flow divider bodies.
Cavity: VC12-4; See page 9.112.1_4w
Cavity Tool: CT12-4xx; See page 8.600.1
Seal Kit: SK12-4x-MMM; See page 8.650.1

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.




FD52-45 Flow vs. Pressure



FD52-45 Valve Dimensions



Cartridge: Weight: 0.24 kg (0.53 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 8.012.1_4w.



FD52-45 Ordering