NRS™ Needle Control Valves

Low Flow Gas & Liquid Flow Control Valves

Models 8503F / 8504F

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).

Description

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

Product Type

Valve

Differentiator

Designed for Extremely Low Flow Applications
Straight and 90° Angle Pattern Models Available
Wide Choice of Flow Ranges

Flow Range (Full Scale Capacity)

See Capacities & Pressure Drops Table in Data Sheet

Max Pressure

Stainless Steel Model: 1000 psig

Max Temperature

Stainless Steel Model: 250oF (120oC)

Connection Types

Standard: 1/8″ female NPT – integral
Optional: 1/8″, 1/4″ compression fitting; 1/4″ female NPT; 1/4″ ID hose type adaptors

Dimensions

See Dimensions Figure

Materials of Construction

Body
316 Stainless Steel

Orifice
Size 1-3: Stainless steel and Teflon®;
Sizes 4-6: Stainless Steel

Valve Needle
316 Stainless Steel

Plunger
Stainless Steel

O-Rings
Viton® fluoroelastomers

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