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The piston is flush with the reactor or dryer, leaving no dead space.

A perfect seal is formed directly by the piston against the body of the valve.

Turn the handwheel counter clockwise to lower the piston to its open position.

While the product flows down into the sampling bottle, the operator can check the desired quantity of the product through the sight glass.

Turn the handwheel clockwise to bring back the piston in its closed position.

A firm final turn of the handwheel will give reliable sealing and no dead space. Equalise the pressure (or vacuum) in the chamber by opening the valve.

Remove the sampling bottle on its quick coupling connection.