Valves are essential type of fitting to any system as they regulate control and regulate fluid flow within that system. There are numerous different types of valves such as ball valves, globe valves, gate valves, butterfly valves, and many more. However, most valves can be broken down into the same list of general components. The typical components found in the valve include the valve body, a plug, seats, a stem, and packing to seal the valve. LABELED PICTURE OF VALVE COMPONENTS As a valve is designed to regulate flow it is critical that the plug properly contacts the seat surface to create a seal that is leak-proof. Seats are classified in two separate categories: hard seats and soft seats. Hard seats, made of metal and integral to the valve body, are typically found in globe and gate valves. Soft seats, made of plastics or elastomers, are typically found in ball and butterfly valves. As these are seats are made of a much softer material than the plug, the design life of the valve seats must be taken into consideration due to seat wear.