Pneumatic Products, Air Treatment (FRL)

Regulator Model 651

  • Rolling diaphragm for extended service life
  • High flow with low pressure drop
  • Accurate pressure regulation


Regulators are needed for certain pneumatic equipment that requires constant air pressure regulation. CEJN’s Model 651 offers a standard adjustment range of 0.5-10 bar to maintain the required pressure level. Our regulator range features a rolling diaphragm to maximize service life, a locking device to prevent unintentional adjustment, and a gauge for visual pressure control. The high flow capacity and low pressure drop help save energy and cut costs. CEJN Model 651 is available with G 1/8" and G 1/4" threads.

Application: Virtually every industry, e.g. manufacturing, food, processing, carpentry, paper mills, etc., relies on compressed air as an energy source. In a shared compressed air network, with numerous outlets and an extensive pipework system, air preparation units are especially important.


For smaller and larger sizes, CEJN offers Model Mini, Model 652 and Model 160. Additional air treatment products are available in the air treatment range including preassembled units.

Regulator Model 651
Part No. A B C D F G H I J  
19 503 1202195031202 103 50 G 1/8" G 1/4" 29 58 61.4 53 50 -
Regulators Part No. Connection Max inlet pressure Controlled pressure Max flow
  19 503 1202 195031202G 1/4"16 bar (232 PSI)0.5-10 bar (7-145 PSI)2000 l/min (70.6 CFM)


Check with an authorized CEJN distributor for availability and prices. Other connections and sealing material on request. Some part numbers may be subject to minimum order quantities. CEJN reserves the right to make changes without further notification. Thread connections are listed according to ISO Standards.
Technical data
Media: Compressed air, neutral gas
Max. working pressure: 16 bar (232 PSI)
Temperature range: -20°C — + 50°C (-4°F — + 122°F)
Material body: Aluminium
Controlled pressure: 0.5-10 bar (7-145 PSI)
Hysterisis: 0.3 bar (4 PSI)
Regulating device: Rolling diaphragm (very low hysterisis)
Material seal: Nitrile

Flow capacity is measured at 6.3 bar (91.4 PSI) inlet pressure, and pressure drop at 1 bar (14.5 PSI).

Air Flow
Outlet pressure, bar (PSI) Regulator Model 651 Flow, l/min. (CFM)

Available files for download

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