Service Instructions
for Valv-Trol
Balanced Valves:

1. Introduction
2. Servicing the Diaphragm
3. Servicing the Packers
4. Servicing the Valve Seats
5. Why Lap?
6. Lapping Procedures
7. Testing After Maintenance

Installation and Operating Instructions For Valv-Trol Back Pressure Relief:

1. Principle of Operation
2. Installation and Operation
3. Service Life
4. Built-in Spares
5. Servicing the Diaphragm
6. Valve Disassembly
7. Reassembly
8. Testing after Servicing