Parker Pneumatic
337 Series Micrometer Flow Control Valves 1/8

Key Features
  • Micro-fine Adjustment
  • Heavy Duty Brass
  • Locks with set screw
  • NPT - 1/8-3/4"
  • BSPP - G-1/8-1/4

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The “337” Series Flow Control Valves meter flow of air in one direction and allow free flow in the reverse direction. 

The “337” Series valves are manufactured with a fine tapered needle providing precise flow control, even at low flow rates. The perimeter of the adjustment knob features numerical micrometer position markings providing a visual indication of the setting. Once the desired flow is selected, a set screw can be tightened to maintain the setting. 

These valves are available with NPTF ports in 1/8", 1/4", 3/8", 1/2", and 3/4" sizes. This series is recommended for pneumatic service.

Valve Specifications

  • Maximum Operating Pressure:  250 PSI
  • Cracking pressure for return check poppet: 1 to 2 PSIG
  • Operating Temperature: Standard: 0° to 180°F*
  • Extended Temperature: 0° to 300°F* (consult factory)

Component Materials 
  • Body Material................................................................Brass 
  • Needle ............................................................Stainless Steel 
  • Check Seal.............................................................. Urethane 
  • Needle Seals..............................................................Buna N (Fluorocarbon optional – consult factory) 
  • Knob .......................................................................Aluminum 
  • Spring.............................................................Stainless Steel 
  • Retainer..................................................... Zinc- Plated Steel Set 
  • Screw.......................................................................Steel