Most globe valve designs focus on the disk, seat and stem. There are three types of disks, namely ball, composition and plug disk. The ball disk is common with low pressure and low temperature systems as it is capable of throttling flow. The composition disk uses a hard, non-metallic insert ring to achieve a tighter closure whereas a plug disk is long and tapered, which makes it a better performer than ball and composition disks.
Most globe valve seats are either screwed or integrated to the valve body. Backseats prevent pressure from building against the valve packing. They are located between the stem and bonnet. There are globe valve systems that use the bonnet to function as a seat, which normally acts as a sealant.
The disk and stem can only be connected using two methods: the disk nut construction and the T-slot method. The disk nut construction connects the two by screwing in the disk into the stem. For the T-slot method, the disk slides over the stem. Globe valves have a good shutoff capability, high throttling capabilities, use shorter strokes as opposed to gate valves and are available in tee, angle and wye patterns, which offer unique capabilities.