Shotcrete pump mechanism - GIF

Shotcrete pump mechanism.

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Previously:

https://www.homemadetools.net/forum/...297#post188583

What on Earth am I looking at? Is that hydraulic? It's moving really fast for hydraulics. Is it pneumatic?? Is it actuating a flop gate or something?? I'm intrigued.

Quote:

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Originally Posted by nova_robotics

What on Earth am I looking at? Is that hydraulic? It's moving really fast for hydraulics. Is it pneumatic?? Is it actuating a flop gate or something?? I'm intrigued.

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Shotcrete is sprayed concrete, so something has to build up pressure and send it to the nozzle. A regular concrete pump has much lower pressure but higher volume:

https://www.youtube.com/watch?v=YanHEgfepC0

Quote:

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Originally Posted by BuffaloJohn

Shotcrete is sprayed concrete, so something has to build up pressure and send it to the nozzle. A regular concrete pump has much lower pressure but higher volume:

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Yes, but what is going back and forth in the video? It doesn't look like any pump I've ever seen.

Animation of the mechanism:

https://www.youtube.com/watch?v=9USVI3Xj5Ow

https://www.polmix-ast.pl/s-valve-drive/

Quote:

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Originally Posted by Altair

Animation of the mechanism:

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Excellent. There it is. It's a diverter valve. Very cool. Thanks!