Re: Super Live Hydraulic Pump

Posted by Bob M on June 28, 2001 at 12:41:54 from (192.232.119.194):

In Reply to: Super Live Hydraulic Pump posted by Jeff on June 28, 2001 at 10:05:35:

I suppose you could connect the pump inlet and outlet and fill this "system" with fluid. Problem is filling it (connections are at the low point on the pump), and dealing with fluid expansion/contraction as the fluid warms up/cools down in the loop. The up side is you won't need any extra valving to control flow/pressure between inlet and outlet.

I'd be cautious about running the hydraulics in black iron. You'll wind up with a lot of fittings (including several unions) which cost $ and are liable to leak. Also black iron (or galvanized) pipe can release mill scale into the system - not good for the pump and valving - unless it's thoroughly cleaned and pickled before it's installed. And the finished job will look like it was plumbed by the 3 Stooges - not worthy of the good looks of an SMTA!

Suggest this as a relatively low cost option: Buy only the hoses req'd to run between the pump, the 4-way and the reservoir. Only two need to be pressure rated: Pump outlet to 4-way, and 4-way pressure to tank. The others run at zero psi - can be simple oil-resistant hose with barb fittings and hose clamps. The hose req'd won't cost a lot more than the pipe, fittings and threading needed to run it in black iron. Then install pipe plugs in the two outlet (cylinder) ports on the 4-way. You can always remove the plugs and add hoses for the remote cylinder connections as budget permits later on.

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