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Quarter Turn Shut-Off Valve

1/8” - 1/2" NPT
1/8” - 1/2" Dual Ferrule Tube
0 – 3000 Psig (207 Bar)


Series SOV Shut Off Valves offers low torque, quarter turn, positive shut off of forward flow up to 3000 Psig (207 Bar). These valves feature a one piece body construction with a machined metallic replaceable plug Stem. Sealing is accomplished with a standard elastomeric O-Ring seal. Larger size valves utilize Teflon Backup Rings to reduce operating torque and provide long service life. The Series SOV can be ordered Cleaned for Oxygen Service.


  • Straight-Through Flow Path
  • Large Orifices Provide Higher Flows
  • Handle Orientation Indicates Flow
  • Optional Downstream Vent
  • Unique Soft Open Plug Stem
  • NPT or Dual Ferrule Tube Connections
  • 100% Factory Tested for Leakage

Technical Data

  • Maximum Operating Pressure @ 100º F
    • Brass and Stainless: 3000 Psig (207 Bar)
      Notes: 1-1/8" (28.6 mm) Square Brass Body Valves downgraded to 2000 Psig (137 Bar) Max. If reverse flow occurs, differential pressure is limited to 150 Psid (10.3 Bar) Max. Attempting to meter flow in the reverse flow direction may damage O-Ring.
  • Leakage: Zero both Internal and External
    • 100% Factory tested for leakage at 150 Psig (10.3 Bar)
  • Downstream Vent Option - Downstream pressure is relieved to atmosphere when valve is in the closed position. Maximum operating pressure is downgraded to 150 Psig (10.3 Bar).
  • Downstream Vent Orifice:
    • 5/8" (15.9 mm) and 3/4" (19.1 mm) Square Body Valves: 0.04" (1.0 mm)
    • 1-1/8" (28.6 mm) Square Body Valves: 0.09" (2.3 mm)
  • Temperature Range:
    • Seal Dependent (See How To Order)

Materials of Constructions

Component Brass Stainless Steel
Body, Plug Stem, Nuts and Ferrules Brass, ASTM B16 316SS, ASTM A479
Handle 6061 Aluminum, ASTM B211, 
Anodized per Mil-A-8625
Orifice/Body Seals Buna-N, Neoprene, 
Ethylene Propylene, or Viton®
Backup Ring¹ PTFE
Retaining Ring PH 15-7 Mo SS, AISI 632
Stop Pin 18-8 SS
¹  5/8" Square Body Valves are not supplied with PTFE Backup Rings
   Plug Stem and O-Rings are lubricated with Krytox®.

Dimensionsional Data

Ordering Information

PROPER COMPONENT SELECTION - When specifying a component, the total system design must be considered to ensure safe and trouble-free performance. Intended component function, materials compatibility, pressure ratings, installation, environment and maintenance are the responsibility of the system designer.