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Varec Biogas

Varec (VApor RECovery Specialty Company) began business in the 1930's at its manufacturing plant in Compton, California. Varec was there in the infancy stage of the biogas market in the early 1950's. From the onset, Varec's focus was to deliver Biogas Handling products that suited customers' specific requirements, even if it meant creating the product off the drawing board. Varec initially sold direct to end-users and in the 1970's instituted a Sales Representative Network that catered to Municipal Wastewater Treatment Plants. A select number of Sales Representatives in the United States helped Varec acquire approximately 90% installed base from the 2,500 Wastewater Treatment Plants that utilize Anaerobic Digesters for Biosolids Treatment built between the mid-60's to late 70's. Today, Varec Biogas is 100% dedicated in providing total solutions to the biogas market. In February, 2003, Westech Industrial Inc. acquired the biogas portion of the Varec business from Tyco Valves and Controls, LP Inc.

Relief Valve

Varec Biogas 2010B / 2020B Relief Valve

Varec 2010B/2020B Series Pressure Vacuum Relief Valve protects anaerobic digesters against physical damage caused by routine increases in internal pressure or vacuum. It is available in vent to atmosphere, or in pipe-away models, in a wide range of sizes, with 356HT low copper aluminum as the standard material for biogas. In climates with extremes of hot humid weather and freezing winter conditions, an “All-Weather” version is available. For ease of maintenance, two units for mounting on a three-way valve are recommended. This type of installation permits servicing of one unit while the tank remains in operation.



  • 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)