What's the difference between the cut-off, check, check, and stop valves three? Better picture,

Vertical Swing Check Valve Pilot Operated Check Valve Lift Check Valve Animation Check Valve Flow Direction Mechanical Check Valve Ductile Iron Check Valve Cast Iron Valve Cast Iron Check Valve Georg Fischer Ppr Pipes Catalogue Quarter Round Moulding Stainless Steel Strainers Stainless Steel Triply Stainless Steel Gate Stainless Steel Gate Latches Stainless Steel Gate Latch Stainless Steel To Brass Stainless Steel Gate Hinges 1/8 Inch Aluminum Plate 1 8 Inch Aluminum Plate Quarter Inch Aluminum Plate