Pressure drop ratings are typically a function of the valve type, trim style, materials of construction, and fluid temperature. Manufacturers may publish maximum pressure drop…

In rotary-shaft valves, the surface area of the closure member is generally quite large as compared to the surface area of the bearings and bushings…

While the ANSI Class rating and bolting pressure limits describe the pressure retaining ability of a control valve, the internal components (trim) typically determine the…

Although the valve body and bonnet are the major pressure-containing components, other components such as the body-to-bonnet bolting can influence the pressure and temperature limits…

The selection of a particular material of construction for bodies and bonnets is often based on economics, material strength, erosion resistance, and the compatibility of…

Although they are less popular than sliding-stem control valves, a wide range of rotary-shaft control valves, including ball valves, butterfly valves, and rotary-plug valves, are…

Sliding-stem valves include globe valves, angle valves, and axial flow valves. Of all the control valve types, the sliding-stem, globe style valve is the most…

Emergency isolation valves are distinguished from control valves by function and by performance requirements. Emergency isolation valves are designed to provide tight shutoff when closed,…

The role of a block valve is to fully open or fully close a pipeline. Block valves are not subjected to the rigors of throttling…

A control valve serves as a variable orifice. The variable orifice includes a port and a closure member such as a plug, disk, or ball.…