Final answer:
Friction wear is reduced in a split wedge and/or double disc valve because these designs facilitate smoother movements, minimize contact point stresses, and distribute pressure more evenly, which lessens the friction forces and heat generation during operation.
Step-by-step explanation:
The friction wear is reduced on a split wedge and/or double disc valve because these designs help to minimize the resistance experienced during operation. In mechanisms, especially those with moving parts, friction can lead to wear and tear by converting kinetic energy into heat. This is analogous to how a book sliding across a floor loses kinetic energy to heat caused by friction or how car brakes heat up when stopping a vehicle.
In the context of a split wedge or double disc valve, the geometric optimization allows for a more even distribution of pressure and smoother movements, thus reducing the contact point stresses and the likelihood of wear due to friction. Such design improvements reduce the need for excess force to operate the valve, which in turn minimizes the wear over time and extends the lifecycle of the components. Furthermore, reducing friction in mechanical systems can lead to improved efficiency and performance, as less energy is lost in overcoming resistance.