MaxAir™ II 5"×4" Internal ValveAir Operated

Product Datasheet

Technical specifications, dimensions, and installation notes for the OPW Civacon MaxAir II Series.

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OPW Civacon MaxAir II Series

MaxAir™ II 5"×4" Internal Valve

No moving parts in the flow path — superior flow rates and faster drops for petroleum applications.

The Civacon MaxAir™ II 5x4 Air Operated Emergency Valve is an optimal choice for petroleum applications. The MaxAir™ II series valves are uniquely engineered with no moving parts in the flow path for a superior flow rate. Civacon's 5x4 MaxAir™ II Emergency Valve is designed with an independent external exhaust, which isolates the valve exhaust from the rest of the system. This valve is compatible with diesel, biodiesel, gasoline, ethanol and methanol products. The Viton GFLT and Teflon encapsulated seals provide ultimate product compatibility. It features an integrated air inlet that allows the unit to close if it becomes sheared in the result of an accident. It incorporates a frangible shear groove per 49CFR178.345-5 tested per TTMA RP 84. A factory installed fusible plug that will melt at a temperature of 212° F (100° C) allowing the valve to deplete air pressure. Also included is a mechanical jack screw for manual operation in the event of air pressure loss. Operating Pressure Requirements: Minimum of 40 psi (4.83 bar) operating line pressure.

Technical Specifications

Valve Size5" × 4"
OperationAir operated emergency valve
Operating PressureMinimum 40 psi (2.06 bar) line pressure
Fusible PlugMelts at 212°F (100°C)
Shear GrooveFrangible per 49CFR178.345-5, tested per TTMA RP 84
Body & PoppetAluminium
Shaft & SpringStainless steel
SealsViton GFLT and Teflon encapsulated
Sump Compatibility4" TTMA sumps
Fuel CompatibilityDiesel, biodiesel, gasoline, ethanol, methanol

Typical Applications

  • Petroleum tank truck bottom outlet emergency shut-off
  • Air operated internal valve installations on fuel tankers
  • Diesel, biodiesel, gasoline, ethanol and methanol service
  • Installations requiring independent external exhaust isolation
  • Applications requiring manual override via mechanical jack screw

Features & Benefits

  • Designed for petroleum applications
  • No moving parts in flow path for superior flow rates and faster drops
  • Integrated external exhaust
  • Viton GFLT and Teflon encapsulated seals for superior compatibility
  • Mechanical jack screw opening allows product to be off-loaded in the event of air pressure loss
  • Compatible with 4" TTMA sumps
  • Compatible with diesel, biodiesel, gasoline, ethanol and methanol
  • Aluminium body and poppet, stainless steel shaft and spring
  • Available in a variety of configurations
  • Operating pressure minimum 40 psi (2.06 bar) line pressure

Part Numbers

VA518190° Elbow/Victaulic — Internal Air/External Exhaust, Viton Seal
VA518290° Elbow/Victaulic — Internal Air/External Exhaust, Tef-o-Sil Seal
VA618190° Elbow/Flanged — Internal Air/External Exhaust, Viton Seal
VA618290° Elbow/Flanged — Internal Air/External Exhaust, Tef-o-Sil Seal
VA7181Straight/Victaulic — Internal Air/External Exhaust, Viton Seal
VA7182Straight/Victaulic — Internal Air/External Exhaust, Tef-o-Sil Seal
VA8181Straight/Flanged — Internal Air/External Exhaust, Viton Seal
VA8182Straight/Flanged — Internal Air/External Exhaust, Tef-o-Sil Seal

Repair Parts

13139VRKSeal Repair Kit (Viton) — manufactured after 07/31/17 (replaces 12576VRK)
13139RKSeal Repair Kit (Tef-O-Sil) — manufactured after 07/31/17 (replaces 12577RK)
13139VRK-PSeal Repair Kit with Poppet (Viton) — manufactured before 07/31/17
13139RK-PSeal Repair Kit with Poppet (Tef-O-Sil) — manufactured before 07/31/17

Authorized Distributor

Voltika is the authorized distributor of OPW-Dover India Private Limited. All products are genuine OPW-Dover, supplied with full manufacturer warranty and after-sales support.

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