SemperFiSawguy
ArboristSite Member
After forum surfing for a few weeks unsuccessfully to answer my question and being told to pound sand by Splitez for answers. I have come back to ask if anyone can help me figure out how to size pilot ratio and cracking pressure requirments for a pilot to open check valve on my splitter build.
I originally ordered a parker CSPH161P-12P
With a parker CVH161P check valve. Specs on that are 50gpm with a 3:1 pilot ratio and a cracking pressure of 5psi. I have this valve in hand, but im not sure i want to try it and not be able to return it since im second guessing myself.
Is that to low of a cracking pressure? My concern is that during the extend stroke the port pressure will be over 5psi and be enough to send a pilot signal to the base port pilot operated check valve and bleed off pressure from my extend stroke.. or even create hammering with a shudder since the check valve could be potentially open and close repeatedly as pressure builds and drops off. Has anyone used that valve before in this application? Splitez sells a SUN ckgb-xcn valve and a standard ECN block rated for 30psi cracking pressure. Which makes me think i should have at a minimum 20psi to have the cracking pressure higher then what my return flow PSI is on my return circuit based on my filter gauge. Which never exceeds 15psi even with cold oil at WOT. My build thread is at this link at the bottom since im not sure how to attatch it.
Possible relevant figures if it helps get my questions answered,
22GPM pump
4.5 inch cylinder with 3 inch rod and 3/4 ports
Prince autocycle
All 3/4 work lines
1 inch to 1.5 inch and 80gpm filter head and return lines
Current return stroke backpressure from the base port is 180psi cold oil WOT on the pressure side
12-15 PSI return low pressure side via gauge on filter head for return stroke and 5ish PSI extend stroke.
My assumption is cracking pressure should be higher then possible extend stroke PSI on the rod side port but somehow still much lower then return stroke PSI WITH the check valve open and all oil bypassing directly to the return circuit. Trouble is i dont know what that available pilot pressure will be post valve activation. Until i plumb it in and try it.. Im not an engineer so im struggling to find examples or guidance for this exact application and my local hydraulic shop doesnt have an engineer on staff. I have not yet called parker for information. Only person ive called so far was splitez and he got all pissy and hung up because i knew his super top secret proprietary $50 valves part numbers that he sells for $200.
https://www.arboristsite.com/threads/log-splitter-modifications-build.372122/#post-8171447Thank you in advance for taking the time to read all that.
I originally ordered a parker CSPH161P-12P
With a parker CVH161P check valve. Specs on that are 50gpm with a 3:1 pilot ratio and a cracking pressure of 5psi. I have this valve in hand, but im not sure i want to try it and not be able to return it since im second guessing myself.
Is that to low of a cracking pressure? My concern is that during the extend stroke the port pressure will be over 5psi and be enough to send a pilot signal to the base port pilot operated check valve and bleed off pressure from my extend stroke.. or even create hammering with a shudder since the check valve could be potentially open and close repeatedly as pressure builds and drops off. Has anyone used that valve before in this application? Splitez sells a SUN ckgb-xcn valve and a standard ECN block rated for 30psi cracking pressure. Which makes me think i should have at a minimum 20psi to have the cracking pressure higher then what my return flow PSI is on my return circuit based on my filter gauge. Which never exceeds 15psi even with cold oil at WOT. My build thread is at this link at the bottom since im not sure how to attatch it.
Possible relevant figures if it helps get my questions answered,
22GPM pump
4.5 inch cylinder with 3 inch rod and 3/4 ports
Prince autocycle
All 3/4 work lines
1 inch to 1.5 inch and 80gpm filter head and return lines
Current return stroke backpressure from the base port is 180psi cold oil WOT on the pressure side
12-15 PSI return low pressure side via gauge on filter head for return stroke and 5ish PSI extend stroke.
My assumption is cracking pressure should be higher then possible extend stroke PSI on the rod side port but somehow still much lower then return stroke PSI WITH the check valve open and all oil bypassing directly to the return circuit. Trouble is i dont know what that available pilot pressure will be post valve activation. Until i plumb it in and try it.. Im not an engineer so im struggling to find examples or guidance for this exact application and my local hydraulic shop doesnt have an engineer on staff. I have not yet called parker for information. Only person ive called so far was splitez and he got all pissy and hung up because i knew his super top secret proprietary $50 valves part numbers that he sells for $200.
https://www.arboristsite.com/threads/log-splitter-modifications-build.372122/#post-8171447Thank you in advance for taking the time to read all that.