Flow Control Valves

NV08-21 — Needle Valve with Positive Shut-Off
  Selection guide - similar valves.
  PDF file of this page.
  STP file for NV08-21.
  Request a quote.

NV08-21 Valve

NV08-21 Valve symbol

A screw-in, cartridge-style, variable orifice, hydraulic flow restrictor valve.
It is intended for applications requiring fine adjustment over multiple turns.

The NV08-21 increases its orifice value from fully-closed to fully-open with
counterclockwise adjustment rotation. 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.

• Adjustments cannot be backed out of the valve.
• Hardened parts for long life.
• Fine/Low-effort adjustment.
• Positive shut-off.
• Compact, industry-common cavity.

Operating Pressure: 241 bar (3500 psi)
Flow: 53 lpm (14 gpm) max.
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 100°C (-40° to 212°F) with Buna seals;
   -26° to 204°C (-15° to 400°F) with Fluorocarbon 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
Cavity: VC08-2; See page 9.108.1_2w
Cavity Tool: CT08-2xx; See page 8.600.1
Seal Kit: SK08-2x-M; See page 8.650.1

NV08-21 Valve Performance Chart

NV08-21 Valve Dimensions


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_2w.

NV08-21 Ordering Chart

Selection guide - similar valves.
PDF file of this page. STP file for NV08-21 Request a quote.