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Pressure Seal Globe Valve Principle 2011-11-16

A globe valve is a type of valve used for regulating flow in a pipeline, consisting of a movable disk-type element and a stationary ring seat in a generally spherical body. Globe valves are named for their spherical body shape with the two halves of the body being separated by an internal baffle. This has an opening that forms a seat onto which a movable plug can be screwed in to close (or shut) the valve.

Forged Steel Pressure Seal Globe Valve is used in Oil Refining and other industrial applications where forged steel material is required. Higher pressures and temperatures are involved and the line size is generally under 2-1/2”. Other factors could also favor the selection of forged steel, such as system requirements for socket-weld piping and compatibility of media.

The Pressure Seal Globe Valve design incorporates a metal-to-metal seal that becomes tighter as the pressure increases. The initial preload deforms the taper on the soft iron gasket to mate with the taper on the bonnet. The thin knife-edge on the gasket is wedged tightly between the body and the bonnet. The shallow angle insures that the gasket is sealed tightly with only a small upward force on the bonnet. Once the initial seal is created, the body/bonnet joint will remain leak free regardless of thermal or pressure conditions in the valve.After the joint has been assembled, there is no further need to adjust bonnet cap screws.

The article comes from Pressure Seal Globe Valve.

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