Created on 06/23/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 1 of 2
MODEL
NFFD
Fully adjustable needle valve
SERIES 4 / CAPACITY: 530 L/min. (21,6 mm) / CAVITY: T-18A
Needle valves are fully adjustable orifices used to regulate flow. They are infinitely adjustable from fully closed up to
the maximum orifice diameter. They are not pressure-compensated. They may be used as flow controls or as
shutoff valves.
TECHNICAL DATA
Maximum Operating Pressure 350 bar
Adjustment - Number of Counterclockwise Turns - Fully Closed to Fully Open 5
Locknut Hex Size 15 mm
Locknut Torque 9 - 10 Nm
Seal kit - Cartridge Buna: 990-018-007
Seal kit - Cartridge Polyurethane: 990-018-002
Seal kit - Cartridge Viton: 990-018-006
(L)CONTROL
L Standard Screw Adjustment
H Calibrated Handknob with Detent Lock
K Handknob
R Capped Screw Adjustment
Y Tri-Grip Handknob
(I)MAXIMUM ORIFICE DIAMETER
I .85 in. (21,6 mm)
(N)SEAL MATERIAL
N Buna-N
E EPDM
V Viton
MATERIAL/COATING
Standard Material/Coating
/AP Stainless Steel, Passivated
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NFFD
TECHNICAL FEATURES
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.
The flow path through this valve is bi-directional. The preferred path is port 1 to 2, to allow interchangeability with other flow controls.
There is no leakage when the adjustment mechanism is turned to the shut-off position.
Cartridges with EPDM seals are for use in systems with phosphate ester fluids. Exposure to petroleum based fluids, greases and lubricants will damage the seals.
Model Code Example: NFFDLINCONFIGURATION OPTIONS
Created on 06/23/2015
c
2015 Sun Hydraulics Corporation See www.sunhydraulics.com for detailed product information 2 of 2
