I found this useful Book (Valve Handbook) while browsing internet and I thought to share this with our pipers.

VALVE HANDBOOK HANDBOOK FREE DOWNLOAD

1. Introduction to Valves
2. Valve selection criteria
3. Manual Valves
4. Control Valves
5. Manual Operators and Actuators
6. Smart Valves and Positioners
7. Valve Sizing
8. Actuator Sizing
9. Common Valve Problems

VALVE HANDBOOK DOWNLOAD

Valve Book by 22_22