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  1. #1
    Silver Member
    Join Date
    Jun 2011
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    227
    Location
    Penobscot,Me
    Tractor
    07 Kioti DK45 SE HST/401 FEL

    Default Relief valve

    I need to eat crow. Awhile back I converted an old Fisher plow to QA. I extended rear remotes to front of FEL and used QD's for connecting to angle cylinders. I did not use a cross over relief valve. I thought there was a relief valve built into my Kioti DK45 remote control valve.

    Long story short, pushing snow banks back to get at some logs, I blew a hydraulic hose. It poped like a ballon. Guess I will be adding cross over relief shortly. And yes, I should have been using the bucket, but it was 3 miles away at the time.
    Don
    Kioti DK45 SE HST/401 FEL, 7 ft landscape rake, 4 ft QA forks, 7' Fisher snowplow converted to QA, Satoh Bull 630D w/fel (being restored) JD 317, mower, tiller

  2. #2
    Gold Member mpham's Avatar
    Join Date
    Oct 2011
    Posts
    347
    Location
    Massachusetts
    Tractor
    Kioti ck20

    Default Re: Relief valve

    That sucks! At least the hose blew instead of damaging a piston though.
    Phil. from Mass.
    2006 Kioti ck20 with 425 hours
    New to me 2011 K120 loader

  3. #3
    Veteran Member vtsnowedin's Avatar
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    Jul 2011
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    2,102

    Default Re: Relief valve

    Quote Originally Posted by seacap04 View Post
    I need to eat crow. Awhile back I converted an old Fisher plow to QA. I extended rear remotes to front of FEL and used QD's for connecting to angle cylinders. I did not use a cross over relief valve. I thought there was a relief valve built into my Kioti DK45 remote control valve.

    Long story short, pushing snow banks back to get at some logs, I blew a hydraulic hose. It poped like a ballon. Guess I will be adding cross over relief shortly. And yes, I should have been using the bucket, but it was 3 miles away at the time.
    Your not alone. I managed to pop one hose myself and will be addding a cross over relief before next season. The problem is that with the control lever in closed position the fluid on the plow side of the control valve is isolated from the relief valve built into the system.

  4. #4
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
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    17,339
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Relief valve

    Some valves have work port relief built in
    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  5. #5
    Veteran Member vtsnowedin's Avatar
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    Jul 2011
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    2,102

    Default Re: Relief valve

    Quote Originally Posted by J_J View Post
    Some valves have work port relief built in
    You would think they all would if it is feasible. Apparently JDs rear remotes are not.

  6. #6
    Elite Member
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    Jan 2010
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    2,628
    Location
    Northern, IL
    Tractor
    Branson 2400H

    Default Re: Relief valve

    Work port reliefs are usually an option on higher flow valves like those used are larger Ag tractors. Valves used on CUT's are lower flow lower cost valves with less features and they typically exhaust to tank so you cavitate one side of the cylinder but protect the other.

    Are the cylinders in question single or double acting? If double acting it will only protect for part of the stroke while retracting. Reason being, The volume of fluid in the blind or cap end of the cylinder is greater than the volume in the rod end.
    Artificial Intelligence will never overcome natural stupidity.

    Branson 2400H MMM & FEL

    JD 112

    BX1850 gone but not forgotten

  7. #7
    Veteran Member vtsnowedin's Avatar
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    2,102

    Default Re: Relief valve

    Quote Originally Posted by oldnslo View Post
    Work port reliefs are usually an option on higher flow valves like those used are larger Ag tractors. Valves used on CUT's are lower flow lower cost valves with less features and they typically exhaust to tank so you cavitate one side of the cylinder but protect the other.

    Are the cylinders in question single or double acting? If double acting it will only protect for part of the stroke while retracting. Reason being, The volume of fluid in the blind or cap end of the cylinder is greater than the volume in the rod end.
    In my case they are single acting cylinders on a Fisher plow. When feeding pressure to one the return of the other is open but when the control returns to closed they are locked . Fine until the full weight of the tractor comes against the full cylinder when pushing into a frozen snow bank with the leading side of the plow. A cross over relief valve will allow the two cylinders to balance. I just need to find one set to open at pressures above the 2700psi of the JDs working pressure and below the yield strength of the cylinders and hoses.

  8. #8
    Super Star Member J_J's Avatar
    Join Date
    Sep 2003
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    17,339
    Location
    JACKSONVILLE, FL
    Tractor
    Power-Trac 1445, KUBOTA B-9200HST

    Default Re: Relief valve

    J.J.

    When I works, I works hard. When I sits and thinks, I goes to sleep.

    Git er done.

  9. #9
    Veteran Member vtsnowedin's Avatar
    Join Date
    Jul 2011
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    2,102

    Default Re: Relief valve

    Quote Originally Posted by J_J View Post
    Probably just the thing. Have to get a couple of short hoses and a couple of 1/2" npt Ts and I should be all set. Thanks for the link.

  10. #10
    Veteran Member
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    Feb 2012
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    1,226
    Location
    Northern Michigan
    Tractor
    KIOTI DK50 HST

    Default Re: Relief valve

    Quote Originally Posted by vtsnowedin View Post
    Probably just the thing. Have to get a couple of short hoses and a couple of 1/2" npt Ts and I should be all set. Thanks for the link.
    You don't need to T anything, the T is the X over relief. You just add 2 short hoses and connect to the valve. I usually set these valves on my test bench and at about 3K. CJ
    Kioti DK50HST Cab
    401 FEL
    Saws, 338xp,346xp mod,372xp mod, 390xp, Stihl combi 130 trimmer.

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