Gate Valve Repair

Learn how to address the procedures for disassembly, inspection, and reassembly of a typical gate valve.

Prerequisites

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

Description

This lesson addresses the procedures for disassembly, inspection, and reassembly of a typical gate valve. The lesson covers the locations and functions of valve components. Procedures for disassembling, inspecting, and measuring valve parts and procedures for lapping the disc and checking seat contact are also covered.

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 proper seal between the seat and disc of a gate valve.