Regulating globe valveGLOBE VALVES

Globe valves are used for regulating flows inside of a pipeline. It have a movable disk-type element and a stationary ring seat in a spherical body.

Their  spherical body shape is divided in two halves, separated by an internal baffle. This has an opening that forms a seat onto a movable plug, also called disk, that can be screwed in to shut the valve.

Globe valves are used for applications that requires throttling and frequent operation. They are normally used as sampling valves, that are normally shut, except when liquid flows are taken, because since the baffle restricts flow, they are nor recommended where full, unobstructed flows are required.

PRESSURE SEAL BONNET

Our Valves can adopt pressure seal bonnets to allow high pressure service, typically in excess of 15 Mpa (2250 psi). The main feature about the pressure seal bonnet is that the body-bonnet joints seals improves as the internal pressure in the valve increases, compared to other constructions where the increase in internal pressure tends to create leaks in the body-bonnet joint.

The seal is achieved from the pressure exerted by the fluid flowing trough the valve as follows:

Internal pressure forces the bonnet upwards against the gasket, creating forces in the contact areas between the gasket and the bonnet.

Leaks most commonly arise at the contact surface between the gasket and the body. The area where the body is in contact with the joint is covered by stainless steel, improving surface’s quality and avoiding corrosion issues.

globe valve pressure seal bonnet

Babcock valves’ globe valve pressure seal bonnet detail

ASME CLASSIFICATION

 Notes: The valve weight is for Butt Welding ends. Dimensions in mm, and weights in kg. Dimensions not shown for class 4500 will be given acc. to customer requirements.