E-Mail: aavolyn@bellatlantic.net

Pressure breaker rings are used in pressures over 500 PSI as a surge barrier. The breaker
takes the force of the initial pressure wave and acts as a control valve allowing a steady
stream of gas to build up over rings. It accomplishes this by restricting gas flow through
control clearances. The breaker is also designed to limit return gas flow when the pressure
drops off from discharge to suction. This prevents the returning gas from slamming the
pressure rings forward reducing ring life.

The standard style, TYPE 250, is a radial ring with clearance between the segments. The
gaps in the radial allow the gas to pass through. These rings are bored to rod size. At higher
pressures (1000 PSI and up) the controlled clearance between the segments may be
eliminated as the ring wears in during seating. This will cause the pressure breaker to seal,
causing high frictional heat at the rod and reduced ring life.

The new style pressure breaker, TYPE 251, is bored slightly oversize to the rod. The
clearance now is in the bore of the ring. With the TYPE 251 breaker, there is no chance of
the breaker seizing on the rod and overheating. AAVOLYN engineers have standardized on
this new style breaker for all high speed applications.

616 ORANGE ST.

P.O. BOX 1097

MILLVILLE, NJ 08332

Telephone: 856-327-8040

Fax: 856-327-9595

E-Mail: aavolyn@bellatlantic.net