SUN HYDRAULICS CORP
NCFCLDN
Flow Control

Needle valves with reverse-flow check are fully adjustable orifices used to regulate flow. They are infinitely adjustable from fully closed up to the maximum orifice diameter. An integral high-capacity check valve provides unrestricted flow from port 2 to port 1. They are not pressure compensated.

• All 2-port flow control cartridges are physically and functionally interchangeable (i.e. same flow path, same cavity for a given frame size). However, cartridge extension dimensions from the mounting surface may vary.
• Because needle valves are non-compensating devices, the fixed orifice size will regulate flow through the valve in proportion to the square root of the pressure differential across ports 1 and 2.
• A balanced adjustment mechanism allows for easy adjustment even at high pressures.
• The sharp-edged orifice design minimizes flow variations due to viscosity changes.
• Incorporates the Sun floating style construction to minimize the possibility of internal parts binding due to excessive installation torque and/or cavity/cartridge machining variations.

Additional Resources

• Sun Cartridges with EPDM Seals
• QuickDesign with SmartConnect Offers Drag-and-Drop Schematic Tool
• Sun Expands Corrosion-Resistant Solutions
• Series 4 PLUS Cartridges Offer Higher Flows with Lower Pressure Losses
• Sun Offers Zinc-Nickel Plating for Corrosion Resistance
• Manufacturing Sun Cartridge Cavities
• Check, Flow Control, and Priority Flow Control Valves
• Cavity Information (S-171) and Tooling
• Fluid and Temperature Recommendations
• Sun's Floating Style Screw-In Cartridge
• Performance Data
• Sun Model Code Explanation; 999-901-334
• Units of Measure, Settings, and Conversions
• Cartridges: Materials of Construction