Patent ID: 8662118

Claim:
A coupling comprising: a housing, said housing defining at least in part a nozzle chamber, said nozzle chamber forms a valve chamber, an intake chamber, and an outlet chamber; a vacuum chamber formed by said housing; a main valve in said valve chamber, said main valve being movable between an open position and a closed position; a poppet valve in said outlet chamber, a channel extending through said poppet valve; an air outlet opening from said vacuum chamber into said nozzle chamber; an opening of an air uptake conduit, said opening of said air uptake conduit opening into said vacuum chamber, said air outlet opening being distinct from said opening of said uptake conduit; wherein when the main valve is in the open position the valve chamber is open to the outlet chamber and the outlet chamber is open to the intake chamber, in the closed position, the valve chamber is sealed off from the outlet chamber and the intake chamber is sealed off from the outlet chamber; and wherein said channel in said poppet valve forms at least a portion of said air uptake conduit.