Sensus Gas Regulator 121

Sensus Gas Regulator 121

  • Available Pipe Sizes, Depending on Model: 3/4″, 1″, 1-1/4″ 1-1/2″, 2″, 2-1/2″, 3″, 4″ NPT Screwed
  • Body: Cast Iron (ASTM A126 Class B)
  • Diaphragm case: Die Cast Aluminum Alloy
  • Various configurations and applications


Sensus Regulator Series 121-8, 121-8HP, 121-12, 121-16

The Model 121 is a new dimension in spring regulator capability, offering spring regulator dependability, simplicity and economy. New technology plus contemporary design provides greater capacity, higher inlet pressure, more accurate performance and faster response, with resulting economy.

Use the 121 for commercial and industrial applications: burners, boilers, furnaces, air heaters, kilns, gas engines and benefit from its fast response. Use it also as a large capacity supply regulator on commercial or industrial service lines, or as a small district regulator.

It’s excellent for primary control or monitoring — use it for either or both. The 121 is actually a whole new family of regulators – standard regulator, zero governor or atmospheric regulator, differential regulator, back pressure regulator, or relief valve, vacuum regulator and vacuum breaker.

Compatible with natural gas, propane, LPG, air nitrogen, etc. Special material available for certain corrosive gases.

Technical Documentation


121 Sensus Regulator

General Safety for Industrial Regulators

121 Series Installation and Maintenance Instructions

121 Series Illustration Details