Many textbooks explain how a valve works. The Vickers manual explains what happens when it stops working. It has dedicated sections on contamination control—the #1 enemy of hydraulics—and explains the physics of heat generation and cavitation. This makes it an essential desk reference for maintenance technicians.
Spanning over 1,000 pages, the 6th edition offers comprehensive coverage of hydraulic principles, components, and troubleshooting. Key topics include: industrial hydraulics manual 6th edition pdf link
Danfoss Power Solutions still prints the 6th edition and sells it through their official distributor network. Many textbooks explain how a valve works
Link to official source (not direct PDF, but purchase page):
Search “Danfoss Industrial Hydraulics Manual 6th Edition” on the Danfoss Learning portal or Amazon (sold by third-party training vendors—verify authenticity). Link to official source (not direct PDF, but