2010B / 2020B Relief Valve

The VAREC 2010B and 2020B Series Pressure and Vacuum Relief Valve is designed for use on atmospheric and low pressure storage tanks. The 2010B vents to atmosphere. The 2020B allows vapors to be piped away for recovery or destruction.

The primary function of both models is to protect the tank from physical damage or permanent deformation caused by increases in internal pressure or vacuum encountered in normal operations. On smaller tanks, the valve may also provide sufficient flow capacity for emergency venting. The “aircushion” seating design keeps the valve tightly sealed until the pressure inside the tank approaches the valve setting. Valve selection should be in accordance with American Petroleum Institute Standard 2000 or other applicable standard.

Flow curves are available to assist you in selecting the proper valve size for your venting requirements. Additionally, Varec Biogas’s applications engineering staff and factory trained representatives are always available to assist you. By controlling tank venting, the 2010B and 2020B not only minimize emissions to the environment, but also minimize the loss of product to evaporation. When combined with a well-designed vapor recovery system, the loss can be cut to essentially zero.

The 2011B “All-Weather” Model is recommended for extreme freezing, hot and humid climates. This model features a special non-frosting and icing-resistant coating on the pallet perimeter and pallet stem, guide posts, and tip of seat ring. The optional coating, along with the flexible Teflon® seat insert, provides additional protection against pallets freezing closed.

For high temperature and chemical applications, Varec Biogas recommends one of the extended service options, which offers the selection of o-ring, gasket, and screen material.

Models 2010B and 2020B are part of VAREC modular products which use interchangeable components for assembling a variety of functional configurations. The modular design provides flexibility of field installation and allows the valve to be reconfigured, repaired and even upgraded on-site by simply replacing or adding components.

  • 2010b_l
  • 2010b_2020b
  • Pdf-download-icon


    • Vent to Atmosphere or Pipe Away Model
    • Oversized Pressure and Vacuum Ports
    • Optional "All-Weather Coating of Valve Seats and Guides
    • Extended Service Available for Chemical Applications
    • Replaceable and Interchangeable Pressure and Vacuum Seat Rings
    • 2" - 12" Sizes Available
    • Leakage Rate of 1 SCFH or Less at 90% of Set Point
    • Pressure Settings up to 2 psig (0.14 barg)