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Brooks Instrument NRS Needle Control Valve, Model 8503 and 8504

NRS Needle Control Valve

Brand: Brooks Instrument
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The Brooks® NRS™ (non-rising stem) flow control valves are designed specifically for extremely low flow gas and liquid applications. Straight and 90° angle pattern models in stainless steel are available. 

Ideal for rotameters with needle valves, the line allows needle valve flow control by adjusting a sliding tapered needle. This prevents sticking caused by foreign matter in the fluid. 

These flow control valves are particularly suitable for precise control requirements and possess a high turns-to-lift ratio. The flow is constant for any given stem position.

Six needles with different tapers provide a wide choice of flow ranges. Needles and orifices can be changed without removing the valve body from the line (two different orifices are used, one for needle sizes 1-3, another for sizes 4-6).
Features
  • Smooth non-reversing flow characteristics
  • Constant flow at any given stem position
  • Fifteen turns full open to full close provides high turn-to-lift ratio for excellent resolution
  • Six interchangeable needle tapers, each increases capacity by an approximate factor of three
  • O-ring seal cannot be damaged by overtightening
  • Panel mounting nuts included as standard
  • 1/8" NPT connections integrally machined into body

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Specifications

Brand

Body/Stem Material

  • 316 Stainless Steel

Process Connection

  • 1/4” Female NPT
  • 1/8” Female NPT

Operating Pressure

  • Max 1,000 psig

Operating Temperature

  • Max 250° F

Orifice Material

  • NRS Size 1-3: Stainless steel and Teflon®
  • NRS Sizes 4-6: Stainless Steel
  • CART III All Sizes: PEEK® (Ceramic)

Valve Needle

  • 316 stainless steel

Plunger (NRS)

  • Stainless Steel

O-Ring Material

  • Viton® Fluoroelastomers, Buna-N

Capacity

  • Air: 0.15 to 75.6 SLPM
  • Air: 0.01 to 4.51 Nm3/hr
  • He: 0.3 to 109.5 SLMP
  • He: 0.02 to 6.53 Nm3/hr
  • Water: 0.004 to 2.04 LPM
  • Water: 0.292 to 147 L/hr

For Use With:
  • Mass Flow Meters
  • Variable Area Flow Meters

Documentation

Data Sheets

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