Mechanism
Concrete pump designers face many challenges, because concrete is heavy, viscous, abrasive, contains pieces of hard rock, and solidifies, if not kept moving.
Usually, piston pumps are used, because they can produce hundreds of atmospheres of pressure. Such piston-style pumps can push cylinders of heterogenous concrete mixes (aggregate plus cement).
The pump on the left uses a transfer tube valve, and the one on the right uses seat valves.
Read more about this topic: Concrete Pump
Famous quotes containing the word mechanism:
“Life is an offensive, directed against the repetitious mechanism of the Universe.”
—Alfred North Whitehead (1861–1947)
“The law isn’t justice. It’s a very imperfect mechanism. If you press exactly the right buttons and are also lucky, justice may show up in the answer. A mechanism is all the law was ever intended to be.”
—Raymond Chandler (1888–1959)
“A mechanism of some kind stands between us and almost every act of our lives.”
—Sarah Patton Boyle, U.S. civil rights activist and author. The Desegregated Heart, part 3, ch. 2 (1962)