[PSUBS-MAILIST] Manipulator Hydrolic question

[hank pronk via Personal_Submersibles]

Scott,
The pump runs the whole time the arm is in use.  When you want to grab the gold filled chest, turn on the pump and use the arm then turn it off when your done.  I would keep it simple, besides the arm functions are continuous. It probably takes less power to keep the pump running rather than start and stop constantly.  You could use multiple small pumps that activate with each function, might be simpler in the end.  No valve bank and less complicated.
Hank
--------------------------------------------
On Mon, 1/12/15, via Personal_Submersibles <personal_submersibles at psubs.org> wrote:

 Subject: [PSUBS-MAILIST] Manipulator Hydrolic question
 To: "psubs" <personal_submersibles at psubs.org>
 Received: Monday, January 12, 2015, 5:54 PM
 
 Do
 most submarine manipulator arms have a pump for each
 cylinder controlled electronically from the inside of the
 sub or do they have one pump that is continuously running
 and hoses go in the sub and controlled with valves? Or
 perhaps another way? 
  
 My excavators in my company have one pump that is
 engine driven and it runs continuously an the cylinders are
 actuated by valves. Seems impractical to me to have a
 battery driven pump that runs continuously. 
  
 Thanks,
 Scott Waters
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