This lesson is designed for participants familiar with the operation of gate valves and the proper use of hand tools and precision measuring instruments.

Module Objectives

• Identify the parts of a gate valve and describe their functions.
• Inspect a valve and make adjustments to stop leakage.
• Position rising stem and non-rising stem valves to the half-open position.
• Remove and disassemble the bonnet assembly of a gate valve.
• Use a telescoping gauge to determine if a stuffing box is round.
• Perform a runout to determine if a stem is bent.
• Use an outside micrometer to determine if the stem has excessive wear.
• Lap a disc and perform a contact check of disc mating surfaces.
• Reassemble the bonnet assembly of a gate valve.
• Perform a contact check to determine if there is a proper seal between the seat and disc of a gate valve.