Body and Trim Maintenance (ACV03)

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, as well as control valve body types and trim, and positioners and actuators. A working knowledge of fluid flow characteristics, fluid flow measurement, and typical elements in process loops is recommended.

Description

This lesson applies the concepts and terminology associated with control valve body types and trim, actuators and position to the disassembly, repair, parts replacement and reassembly of linear and rotary action control valves. Symptoms of valve malfunctions, lapping, and post-repair tests are also covered.

Objectives

Describe control valve malfunctions. List causes and effects of control valve malfunctions. Recognize the importance of following facility safety guidelines and manufacturer??s recommendations for valve maintenance. Describe linear valve disassembly steps. Clean and inspect linear valve packing and trim. Recommend replacement of linear valve trim parts. Describe linear valve parts replacement. Describe linear valve packing replacement. List linear valve re-assembly steps. Determine the outcome of linear valve stroking. Describe linear valve leak testing. Explain the necessity of linear valve lapping. Describe the lapping process. Describe rotary valve disassembly steps. Clean and inspect rotary valve packing and trim. Recommend replacement of rotary valve trim parts. Describe replacement of other rotary valve parts. Describe replacement of rotary valve packing replacement. Describe rotary valve re-assembly. Determine outcome of rotary valve stroking.