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Plastic Tank Valves and Vents

These vacuum breaker and pressure relief valves are made according to US Department of Transport norms and are intended as safety devices for the Intermediate Bulk Container industry.

 

General Description of Valves
This unique family of valves is intended to be used as safety devices in Intermediate Bulk Containers. The valve body features 2 inch external threads and is designed to be torqued into a spin weld fitting or a tank lid for a leak-tight installation. (Recomended spin weld fitting, Part Number 58HD)



 

Technical Specifications
Materials of Construction:

  • Valve Bodies & Plungers - High Density Polyethylene (HDPE).
  • O-rings - Nitrile [Buna] or Fluorocarbon [Viton]
  • Other O-ring materials can be used given sufficient lead time.
  • Springs - Zinc-plated Spring Steel and Stainless Steel.
  • Hastelloy C can be used given sufficient lead time.

Functional Operation


752 - Vacuum Breaker only, allows outside air to enter tank. Applications include chemical spraying or rapid pump out of tank. Protects tank from buckling. Tractor Test Certified. Venting with no spillage.

  • Vacuum pressure to open 0.5 psi differential

760 - Combination Pressure Relief & Vacuum Breaker. Provides both pressure relief and vacuum breaking with in a single housing. "Acts as a 2-way breather." Similar in design to the #760 DOT, but releases at lower pressure and has less stringent leak requirements.

  • Vacuum pressure to open 0.5 psi differential
  • Pressure relief 1.5 psi

760 DOT - Combination Pressure Relief & Vacuum Breaker. Currently used for DOT certified IBC's.

  • Vacuum pressure to open 0.5 psi differential
  • No detectable leak 3.0 psi
  • Pressure relief 4.0 psi

 



Additional Features:

A seal is formed at the internal tank surface, minimizing the contact of product vapor with the spring surfaces.
Pre-set factory pressure and suction relief levels. Once set, the unit is permanently joined by ultrasonic welding, preventing alteration of the specified pressure venting levels.
Machined sealing surfaces.
Dome-shaped cover to prevent ice and snow build-up from interfering with valve function.
Valve material contains a full complement of Environmental Stress Additives (ESA) including Ultraviolet (UV) to prevent weathering.

 

Part No
Description
O'Ring Seals
#752-B
Vacuum Breaker
Nitrile [Buna-N]
#752-V
Vacuum Breaker
Fluorocarbon [Viton]
#760
Combination Valve
Nitrile [Buna-N]
#760 DOT-B
Combination Valve
Nitrile [Buna-N]
#760 DOT-V
Combination Valve
Fluorocarbon [Viton]


VENT VALVE - SUCTION RELIEF
Part No
CRACKING PRESSURE
Description
752-B
Open 0.5 PSI Differential
Vacuum Breaker - only, with Nitrile [Buna-N] seals (vacuum pressure to open < 0.5 psi)
752-V
Open 0.5 PSI Differential
Vacuum Breaker - only, with Viton seals (vacuum pressure to open < 0.5 psi)

 

VENT VALVE - COMBINATION PRESSURE & SUCTION RELIEF

Part No
CRACKING PRESSURE
Description
760
Open 0.5 PSI Differential Relief 1.5 PSI
Combination Pressure/Vacuum with Nitrile [Buna-N] seals
760 DOT-B

Open < 0.5 PSI Differential

Relief 4.0 PSI

Combination Pressure/Vacuum with Nitrile [Buna-N] seals
760 DOT-V

Open < 0.5 PSI Differential

Relief 4.0 PSI

Combination Pressure/Vacuum with Viton seals
 

 

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