Patent ID: 7454903

Claim:
An air servo cylinder formed by integrally connecting servo valves to an air cylinder with a manifold block therebetween, the air servo cylinder comprising: flow paths each connecting the air cylinder and a respective one of the servo valves; and air discharge flow paths each releasing, to the outside, compressed air discharged associated with operation of the respective one of the servo valves, the flow paths and the air discharge flow paths being formed within the manifold block, wherein a silencer for reducing exhaust noise is incorporated into each of the air discharge flow paths so as not to protrude from the manifold block to the outside; a sound-deadening material constituted of a porous material; and a holder for replaceably holding the sound-deadening material in each of the air discharge flow paths, wherein the sound-deadening material has the shape of a cup having an end wall section at one end of a cylinder section thereof; wherein the sound-deadening material is accommodated in each of the air discharge flow paths with the end wall section thereof faced toward the outside of the air discharge flow path; and wherein the holder has outflow openings for discharging exhaust that has passed through the sound-deadening material.