What is the seal between the valve stem and the valve cover?
Apply the molybdenum disulfide grease to rubber parts such as Y rubber ring. It can be sealed
Packing seal, packing is determined by working conditions
Most valves:The seal between the valve and valve cover depends on the valve cover gasket.The seal between the valve and the stem depends on the packing.There are also valves, valves and stem seal between bellows, "O" ring, and so on.
