Which type of valve includes guide bushings as part of its internal components?

The correct answer focuses on the valve trim makeup, which refers to the specific components involved in the operational functionality of a valve, particularly its internal parts. Guide bushings are integral to certain types of valves, and their primary role is to support the stem and facilitate smooth operation. This is particularly found in rising stem valves.

In a rising stem globe valve, for example, guide bushings are essential as they allow for axial movement and help to keep the valve stem aligned during operation. This ensures that the valve can open and close effectively without excessive wear or mechanical failure. The presence of guide bushings in the trim makeup serves to enhance the valve’s performance and longevity.

In contrast, check valves, such as lift check valves, don’t typically include guide bushings. Check valves primarily function to prevent backflow without the need for complex internal support structures that guide bushings provide. Their design is usually centered around a closure mechanism rather than an operational stem, making them unsuitable for this context. Thus, the focus on valve trim makeup is specifically appropriate for discussing valves that utilize guide bushings.