It is a Seatless & Glandless valve.     Pinch valve is a modified version of laboratory pinchcock. A rubber sleeve is protected under a cast iron casting. The fluid passing through do not come in contact with either body covering or any other metal par... 

It is a Seatless & Glandless valve The valve up to the size 6” does not have any stuffing box. The salient feature of this valve is that of the piston operation. The piston slides between the two packing rings made of asbestos PTFE and does not rotate; hence t...