Abstract: A muffler for absorbing the noise created by air flowing around a cylindrical body and into the interior thereof by maintaining a predetermined cross sectional area through which the air can freely flow.

Abstract: A servomotor having a metal backing plate for a diaphragm which separates the interior of a front shell and a rear shell into a front chamber and rear chamber. The metal backing plate is attached to a hub which extends through the rear shell. The hub has an axial bore with a first passageway which is connected to the front chamber and a second passageway which is connected to the rear chamber. A control means is retained in the axial bore by the metal backing plate being attached to the hub. When the control means is actuated, fluid under pressure enters the rear chamber and creates a pressure differential. The pressure differential develops a force across the diaphragm which is directly transmitted through the backing plate to an output push rod.

Abstract: A flow control apparatus for use in a servomotor to control the rate of the flow of air through a hub to a control valve. A push rod has a first section connected to the control valve and a second section through which an operator supplies an operational input signal. A truncated resilient disc holds the first and second sections of the push rod away from each other. A filter surrounds the second section and extends radially to fill the interior of the hub. A series of projections extend rearwardly from the truncated resilient disc along the exterior of the filter. When the operator desires to begin a braking sequence, an input force is applied from the operator through the second section into the truncated resilient disc to the first section to actuate the control valve. With the control valve actuated, air will flow from the atmosphere through the filter into the servomotor.