Valves - Flow Controls - Non-compensated - Needle Valve - Standard Adjustment

NV12-20

NEEDLE VALVE

Overview

Description

A screw-in, cartridge style, variable orifice, hydraulic flow restrictor valve

Operation

The NV12-20 valve increases its orifice size from fully closed to fully open with counter-clockwise adjustment rotation

Features

  • Adjustments cannot be backed out of the valve.
  • Desired settings may be locked down.
  • Hardened parts for long life.
  • Aluminum knob option.
  • Positive shut-off.
  • Linear adjustment.
  • Cost-effective cavity.
Pressure Ratings
Pressure rating:
  • 241 bar (3500 psi)
Proof pressure:
  • 345 bar (5000 psi)
Burst pressure:
  • 896 bar (13000 psi)
Flow Ratings
Flow rating:
  • See pressure drop vs. Flow chart
Maximum internal leakage:
  • 0.15 ml/min (3 drops/min) At shut-off
Temperature Ratings
Operating fluid temperature:
  • -40 to 100 °C (-40 to 212 °F) With buna N seals
  • -26 to 204 °C (-15 to 400 °F) With fluorocarbon seals
  • -54 to 107 °C (-65 to 225 °F) With polyurethane seals
  • -40 to 149 °C (-40 to 300 °F) With HNBR seals
Storage temperature:
  • -40 to 70 °C (-40 to 160 °F)
Ambient temperature:
  • -40 to 70 °C (-40 to 160 °F)
Fluids:
  • Mineral based or synthetic hydraulic fluid with lubricating properties
Fluid viscosity range:
  • 7.4 to 420 cSt
Maximum operating contamination level:
  • 18/16/13 per iso4406
Adjustment torque:
  • 0.2 N-m (1.5 in-lb) At 7 bar (100 psi)
  • 16.9 N-m (150 in-lb) At 207 bar (3000 psi)
Unit weight:
  • 0.32 kg (0.70 lb) Option A
Internal wetted surface area:
  • 129 cm² (20 in²)
NV12-20_Flow-Pressure NV12-20_Flow-Turns
NV12-20_Dim

Materials

Cartridge: Weight: 0.32 kg (0.70 lb); Steel with hardened work surfaces. Zinc-plated exposed surfaces; Buna N O-rings and polyester elastomer back-ups standard. Anodized aluminum knobs.

Standard Ported Body: Weight: 0.57 kg (1.25 lb); Anodized high-strength 6061 T6 aluminum alloy, rated to 207 bar (3000 psi); Ductile iron bodies available; dimensions may differ.

Cavity:
Cartridge installation torque:
  • 45 to 50 N-m (33 to 37 ft-lb)
Maximum allowable torque:
  • 102 N-m (75 ft-lb)
Orientation restriction:
  • None
Seal kit:
  • SK12-2X-M-115 X = seal option
NV12-20_Order
POSITION
CODE
DESCRIPTION
NV12-20F-H-J
F
Adjustment Option
F
A
1/4" Hex Allen Head
F
B
1-1/2" Diameter Aluminum Knob with Aluminum Lock Knob
F
C
1/4" Hex Allen Head with Cover Cap
F
D
1-1/2" Diameter Aluminum Knob with Lock Nut
F
E
1-1/2" Diameter Aluminum Knob Only
F
L
1/4" Hex Allen Head with Cover Cap and Lockwire Holes
H
Line Body
H
0
No Body
H
10T
Aluminum SAE 10
H
12T
Aluminum SAE 12
H
16T
Aluminum SAE 16
H
12TD
Ductile Iron SAE 12
H
16TD
Ductile Iron SAE 16
H
8B
Aluminum BSPP 1" (8)
H
8BD
Ductile Iron BSPP 1" (8)
J
Seal
J
N
Buna-N
J
V
Fluorocarbon
J
P
Polyurethane
J
U
PPDI Urethane