This is an animation used in Alkota's service school to help educate people on how the head of a triplex plunger pump is assembled/disassembled.

http://www.youtube.com/watch?v=Y5kNpVuBoAA&feature=c4-overview-vl&list=PLKaGYY0CshvrE2m2tl6OxGWZMtFjH9JvD

Unloader valve breakdown

Here's Alkota's unloader valve breakdown video.

See how the unloader valve is put together and the many different parts involved. The unloader valve is one of the key components for regulating pressure.

http://www.youtube.com/watch?v=Bp8l_Dv8DXs&list=PLKaGYY0CshvrE2m2tl6OxGWZMtFjH9JvD

Spray tip patterns

Check out Alkota's video on spray tip patterns.

http://www.youtube.com/watch?v=tlHQr8afH9s