Patent ID: 6837403

Claim:
A rotary valve comprising: a housing having a cylindrical chamber provided with an inlet communicable with a zone of a first pressure, a first outlet communicable with a zone of a second pressure greater than said first pressure and a second outlet communicating with the exterior of said housing; a shaft journaled in said housing extending through and disposed coaxially relative to said chamber; a rotor mounted on said shaft within said chamber, between said inlet and each of said first and second outlets, having at least one set of circumferentially spaced material receiving pockets communicable sequentially with said inlet, said first outlet and said second outlet for receiving material through said inlet and discharging said material through said first outlet; means intercommunicating said second outlet and the exterior of said housing for diffusing the flow gas vented from said pockets through said second outlet to the exterior of said housing to muffle the sound of venting gas, said diffusing means including a gas permeable wall through which said gas vented through said second outlet traverses.