Results 1 to 9 of 9
-
01-17-2011, 09:08 PM #1
- Join Date
- Apr 2009
- Posts
- 1,023
- Location
- Port Angeles WA
SA, Single Action and DA, Double Action
Since SA and DA cylinders are a pretty common subject, I want to make this comment....
Some SA cylinders can look like a DA cylinder with two ports, but rod side port is always connected to return or straight to tank. Even if rod side is connected to the Control Valve port, there can be a spool SA valve spool, that makes the cylinder SA.
SA or DA is best determined by checking if there is "power down" or not.
-
01-17-2011, 09:17 PM #2
- Join Date
- Jul 2006
- Posts
- 4,409
- Location
- Northwest, WA
Re: SA, Single Action and DA, Double Action
but rod side port is always connected to return or straight to tank.
Even if rod side is connected to the Control Valve port, there can be a spool SA valve spool, that makes the cylinder SA.
-
01-17-2011, 09:33 PM #3
- Join Date
- Apr 2009
- Posts
- 1,023
- Location
- Port Angeles WA
Re: SA, Single Action and DA, Double Action
Yes...
If cylinder is a SA that's plumbed on a "DA" cylinder, the rod side can either be air vented with a filter fitting in the port, or hydr-vented with a hose.
I always prefer hydr-vented because it takes care of oil that by-passes the piston seal, and also keep air moist out of the cylinder.
With the piston side port piped to tank to do the same as above ?
See if I can find an example of a SA spool .....
-
01-17-2011, 09:44 PM #4
- Join Date
- Jul 2006
- Posts
- 4,409
- Location
- Northwest, WA
Re: SA, Single Action and DA, Double Action
-
01-17-2011, 10:34 PM #5
- Join Date
- Apr 2009
- Posts
- 1,023
- Location
- Port Angeles WA
-
01-17-2011, 11:25 PM #6
- Join Date
- Jul 2006
- Posts
- 4,409
- Location
- Northwest, WA
Re: SA, Single Action and DA, Double Action
More questions,,,,
In your first example (OP), port C is plumbed to a SA output spool valve port and port R is plumbed to; return port on valve (1), or tank return (2), or vented to atmosphere(3).
Second example sounds just like the first except ports on cylinder are swapped. Correct ?
(1) If it's a SA spool valve, would there even be a return port on the valve ?
(2) If plumbed to tank (return), would it not 'suck' tank oil back to cylinder during retract mode ?
(3) Vented to air,,,like you said,,,moisture,,, but on a setup like a snow plow SA angle cylinders, you have no other choice but to vent to atmosphere. Correct ?
(4) Speaking of snow plows w/ SA cylinders, and more directly the dual SA angle cylinders, what's the correct plumbing ?, must it only be done with only a SA or DA spool valve ?
(5) Is there a difference between SA piston seals compared to DA ? (one would think so)
((sorry for all the ?'s, SA cylinders and spool valves have been a little cloudy for me.))
-
01-18-2011, 01:46 AM #7
- Join Date
- Jul 2006
- Posts
- 4,409
- Location
- Northwest, WA
Re: SA, Single Action and DA, Double Action
My questions are not limited towards AKKAMAAN specifically.
I'm not shy, I'll learn off anybody.
-
01-18-2011, 05:58 AM #8
- Join Date
- Apr 2009
- Posts
- 1,023
- Location
- Port Angeles WA
Re: SA, Single Action and DA, Double Action
In your first example (OP), port C is plumbed to a SA output spool valve port and port R is plumbed to; return port on valve (1), or tank return (2), or vented to atmosphere(3).
Second example sounds just like the first except ports on cylinder are swapped. Correct ?
(1) If it's a SA spool valve, would there even be a return port on the valve ?
(2) If plumbed to tank (return), would it not 'suck' tank oil back to cylinder during retract mode ?
(3) Vented to air,,,like you said,,,moisture,,, but on a setup like a snow plow SA angle cylinders, you have no other choice but to vent to atmosphere. Correct ? If there is a port, you can plumb a low pressure line to return or tank (below oil level)
(4) Speaking of snow plows w/ SA cylinders, and more directly the dual SA angle cylinders, what's the correct plumbing ?, must it only be done with only a SA or DA spool valve?
(5) Is there a difference between SA piston seals compared to DA ? (one would think so)
((sorry for all the ?'s, SA cylinders and spool valves have been a little cloudy for me.))
-
01-18-2011, 06:52 AM #9
- Join Date
- Jul 2003
- Posts
- 12,951
- Location
- Westminster, MD
- Tractor
- John Deere 3720 CAB, 455AWS
Re: SA, Single Action and DA, Double Action
KennyD
www.boltonhooks.com
Bolt-On Grab HooksTM, Bolt-On Clevis MountsTM, Weld-On Grab Hooks, Specialty Chain and Rigging Accessories, Specialty Hydraulic Components, and MUCH more!
Visit our YouTube Channel
Similar Threads
-
Single Vs double action
By roger540 in forum HydraulicsReplies: 6Last Post: 12-31-2010, 03:05 PM -
Single action or double action Valves?
By Firefighter Kubota in forum HydraulicsReplies: 11Last Post: 01-17-2009, 10:46 AM -
4500 remote hydraulics
By T King in forum New Holland Owning/OperatingReplies: 5Last Post: 11-03-2007, 12:44 AM