Valves are components that control fluid flow or direction and are classified as either multi-turn or quarter-turn. Multi-turn valves include gate, globe, fixed cone, needle, and pinch valves which require multiple turns to open or close, while quarter-turn valves such as ball, butterfly, plug, and spherical valves only require a quarter turn to open or close. Common multi-turn valves are gate and globe valves, and common quarter-turn valves are ball and butterfly valves.

2.  Valve is a component is used to control the flow or direction of
a fluid.
 The material and Manufacturing method are likely same of
Flanges
 Valve classified by, Multi turn valve and Quarter turn valve.
 Multi Turn valves are Gate valve, Globe valve, Fixed cone
valve, Needle valve, pinch valve.
 Quarter return valves are Ball valve , Butterfly valve, Plug
valve and Spherical valve.

3. Gate valve
Globe valve

4. Ball valve
Butterfly
valve