Body Types and Trim (ACV01)

This four individual lesson program trains participants in the function, operation, maintenance, and troubleshooting of common types of control valves.

Prerequisites

This lesson is designed for participants familiar with industrial process control, specifically single loop control and multiple loop control. A working knowledge of fluid flow characteristics, fluid flow measurement, and typical elements in process loops is recommended.

Description

This lesson explains control valve selection factors and demonstrates typical linear and rotary control valve functions and applications. Control valve bodies for several types of valves including globe, butterfly, and ball valves are described. The function and components of valve trim, including the relationship between flow characteristic and trim type is explained.

Objectives

Define control valve function in process systems. Explain how control valves are used in process industries. Describe how control valves can affect process efficiency, product quality, maintenance, safety, and the environment. Describe the systems analysis approach to selecting a control valve. List the types of data needed to choose a control. Valve for a system. Identify examples and applications of linear and rotary valves as well as the associated function and components of valve trim. Describe how differential pressure and flow path affect fluid flow. Describe how the ability of trim to withstand corrosion and erosion affects trim design. List trim materials that can withstand corrosion and erosion. Describe advantages and disadvantages of various packing materials. Describe seal designs that are required where leakage is not acceptable.