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Fisher Y690A Series Gas Blanketing Regulators

  • Manufacturer: FISHER
  • Valve Type: Fisher Regulators
  • Sub-Type:
  • Easy Conversion Between Constructions
  • Sour Gas Service Capability
  • Inlet Pressure Equals Outlet Pressure
  • Corrosion Resistance
  • Multiple Applications


Y690A Series Gas Blanketing Regulator reduces a high-pressure gas, such as nitrogen, to maintain a protective environment above any liquid stored in a tank or vessel. The regulator replaces the volume of vapors with a volume of blanketing gas to prevent the internal vessel pressure from decreasing, when liquid is being pumped out or when the vessel is suddenly cooled, causing vapors to contract. In both cases a slight positive vessel pressure prevents outside, air, moisture and other contaminants from entering the vessel. Type Y690A is a direct-operated regulator used for accurate pressure control on very low-pressure blanketing systems. Downstream pressure is sensed through a pitot tube installed in the lower casing of the regulator, thus no external control line is required. Type Y690AM uses a control line to more accurately control the pressure if the regulator is mounted away from the tank.

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Air Reducing Regulator Regulator

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