Patent Number: 6,168,161

Title: Rotary valve shaft seal

Abstract: A shaft seal having spacers positioned between the packing follower and the body of a valve. The spacers are flat, hard members of a certain thickness which allow maximum tightening of the packing fasteners and determine the maximum pressure the packing follower exerts on the packing material. The spacers have a slot for accommodating the fasteners and a tab that can easily be grasped with a tool, such as pliers. A stack of spacers can be positioned between the packing follower and valve body and then sequentially removed to provide incremental tightening of the fasteners for maintaining pressure on the packing materials by the packing gland. The spacers may include integral locking tabs.

Inventors: Majcen; Robert M. (Westmont, IL)

Assignee: Val-Matic Valve & Manufacturing Corp.

International Classification: F16K 41/00 (20060101); F16J 15/18 (20060101); F16K 41/02 (20060101); F16J 015/18 ()

Expiration Date: 01/02/2018