STEM PACKING ASSEMBLY FOR GATE VALVES AND MEANS FOR REMOVAL

摘要

STEM PACKING ASSEMBLY FOR GATE VALVES AND MEANS FOR REMOVAL Bertram L. Morrison Houston, Texas A packing assembly is arranged between a gate valve stem connected to an actuator and a bonnet secured to the valve body. An externally threaded packing sleeve is threaded within the bonnet and has the packing assembly removably con-nected thereto for movement with the sleeve. The packing sleeve has an outer end portion which extends into an easily disassembled actuator body where it is easily accessible to a removal tool for replacing the packing. The valve stem has a beveled shoulder thereon which engages a flexible inner flange on the bonnet in the closed position of the gate valve to provide a tight metal-to-metal surface contact between the shoulder and flange.