FLOW CONTROLS
NV08-21 Needle Valve with Positive Shut-Off
DESCRIPTION
A screw-in, cartridge-style, variable orifi ce, hydraulic fl ow restrictor valve. It is intended
for applications requiring fi ne adjustment over multiple turns.
OPERATION
The NV08-21 increases its orifi ce value from fully closed to fully open with adjustment
rotation in the counterclockwise direction. Effective adjustment is linear to eight turns.
Note: This is intended as a low-effort adjustment suitable for operation through
linkage. It may be unsuitable in environments where vibration is present.
FEATURES
• Adjustment cannot be backed out of the valve.
• Hardened parts for long life.
• Industry common cavity.
• Fine/low effort adjustment.
• Positive shut-off.
• Linear adjustment.
RATINGS
Operating Pressure: 240 bar (3500 psi)
Flow: See Performance Chart
Internal Leakage: 0.25 cc/minute (5 drops/minute) max. at shut-off
Adjustment Torque Required: 0.34 Nm (3 inch-pounds) at 7 bar (100 psi); 0.68 Nm
(6 inch-pounds) at 207 bar (3000 psi)
Temperature: -40 to 120°C
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
Cavity: VC08-2; See page 9.108.1
Cavity Tool: CT08-2XX; See page 8.600.1
Seal Kit: SK08-2X-M; See page 8.650.1
PERFORMANCE (Cartridge Only)
SYMBOLS
USASI/ISO:
5.030.1
8.3/120
6.2/90
4.1/60
2.1/30
7.5
2
18.9
5
26.5
7
FLOW lpm/gpm
PRESSURE DROP bar/psi
10.3/150
12.4/180
14.5/210
16.6/240
18.6/270
20.7/300
3.8
1
11.4
3
15.1
4
22.7
6
30.2
8
34.1
9
37.9
10
41.6
11
45.4
12
49.2
13
53.0
14
56.8
15
TURNS
1/8 1/4 1/2 3/4 1 1-1/2 2 3-1/2
Line
and
Body
2-1/2 3 4 4-1/2 Full Open
Line
HYDRAFORCE
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Cartridge: Weight: 0.14 kg. (0.30 lbs.)
Steel with hardened work surfaces.
Zinc-plated exposed surfaces.
Buna N O-rings and polyester
elastomer back-ups standard.
Plastic knob with metal insert.
Standard Ported Body: Weight:
0.16 kg. (0.35 lbs.) Anodized high-
strength 6061 T6 aluminum alloy,
rated to 207 bar (3000 psi). Ductile
iron bodies available; dimensions
may differ. See page 8.008.1
MATERIALS TO ORDER
NV08-21__ - __ __ __ - __
Seals
N Buna N (Std.)
V Fluorocarbon
Porting
0 Cartridge Only
4T SAE 4
6T SAE 6
2B 1/4 in. BSP*
3B 3/8 in. BSP*
4B 1/2 in. BSP*
*BSP Body;
U.K. Mfr. Only
NV08-21
5.030.2
DIMENSIONS
Adjustment Option
Extended Shaft Only T
Plastic Knob E
®
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