China Globe Valve Manufacturer

A globe valve, different from ball valve, is a type of valve used for regulating flow in a pipeline, consisting of a movable plug or disc 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. The plug is also called a disc or disk. In globe valves, the plug is connected to a stem which is operated by screw action using a handwheel in manual valves. Typically, automated globe valves use smooth stems rather than threaded and are opened and closed by an actuator assembly.

Globe valves, so-called because of their outside shape, are widely used in plant piping. They are suitable for manual and automatic operation. Unlike the gate valve, the globe valve can be used for regulating flow or pressures as well as complete shutoff of flow. It may also be used sometimes as a pressure relief valve or as a check valve. Compared with a gate valve or ball valve, the globe valve has considerably higher pressure loss in the fully open position. This is because the flow of fluid changes direction as it goes through the valve.

The globe valves are one of the best valves for regulating/ throttling purpose in comparison to other valves where the steam usually just breaks through and tears the valve apart.

The ball valves are probably the best valves for isolation purpose though. Since their sealing surface hardly comes in contact with the flow of steam. That being the major difference.

When we talk about temperature and pressure playing an important role, the higher the temperature and pressure ( ASME Class ) the worse the steam gets and affects the valve. What we mean to say is, a globe valve could last for years in a service where the temperature and pressure are less. Whereas the same globe valve would miserably fail as we go higher on the P and T curve.

Cost definitely comes into place where globe valves are cheaper and can be repaired easily as compared to ball valves. The end users tend to continuously repair or replace the cheap globe valves as they have a lower initial cost.