E-Mail: aavolyn@bellatlantic.net

In designing a solid rider ring two factors must be taken into consideration; the amount that
the ring can be stretched and what percent of memory the ring has to return to its original
size.

Solid rider rings are installed either over the piston diameter, over the rider ring groove on a
split piston, or over a reduced piston diameter (referred to as a slip over diameter). A special
reduced piston diameter is used when the rider ring cannot be safely stretched over the
piston and still shrink sufficiently to fit tightly on the groove diameter.

Most compressors are supplied with a device to install the rider ring. It can be either a cone
type arrangement or other type of mounting device.

In order for the rider ring to be stretched properly to allow ease of installation, it must be
heated to over 500 degrees F. This can be accomplished in a standard oven. At lower
temperatures there is a possibility of breaking the ring or being unable to install it properly.

Once the ring is heated to the proper temperature, it must be installed rapidly over the piston
and tapped into the groove or onto the groove to ensure that it does not contract on the piston
diameter itself before being fully installed.

You can tap the O.D. of the ring using a hammer and a piece of TeflonŽ or soft material
between the hammer and the ring. If the above procedures are followed, you will find that
installation is fairly simple. To ensure that the ring is installed rapidly, the piston and all your
required tools should be close to the oven so that there are no delays in completing the
operation.

AAVOLYN rider rings are designed for optimum ring life. The free ID is calculated to ensure
that the rings do not come loose from the piston under operating conditions. This required
design is successful in applications where more than half of the rider rings travels out into the
valve port area.

616 ORANGE ST.

P.O. BOX 1097

MILLVILLE, NJ 08332

Telephone: 856-327-8040

Fax: 856-327-9595

E-Mail: aavolyn@bellatlantic.net