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  1. RobertHasty

    pump unloading schematics question

    Hi, I have a question regarding the pump unloading valve. Below is the link to the datasheet: https://apps.boschrexroth.com/products/compact-hydraulics/ch-catalog/pdf/059006XYZ_RE18310-13.pdf I cannot understand what is the point of the section (valve) encircled in a picture below. I believe...
  2. RobertHasty

    hydraulic cylinder literature

    Hi, What is the best literature regarding hydraulic cylinder with emphasis on design. Thank. Best regards, Robert
  3. RobertHasty

    7/8 - 14 2B

    Hi, I got this on the drawing 7/8 - 14 2B. What does 2B stand for? Thank you in advance.
  4. RobertHasty

    cooling water seals

    Hi, Does anybody have any experience regarding cooling water (glycol + water) compatibility with FKM and NBR seals? I am referring to the O-rings which can be found on hydraulic hose fittings. I found this compatibility table from Parker...
  5. RobertHasty

    205 VDC vs 230 VAC coils

    Hi, I came across a hydraulic valve with 205 VDC coil recently. The coil has a connector with rectifier mounted on it. That means that the voltage applied to the coil is 230 VAC. I am wondering, why not use an AC valve with 230 VAC coils instead of valve with 205 VDC coils?
  6. RobertHasty

    help identifying a flange

    Hi, Need some help to identify a flange. Attached are the photos of the flange. According to the designations I would say it could be ASME B16.5 flange with groove RTJ. Any opinion would be appreciated. Thank you.
  7. RobertHasty

    Standards vs norms

    Hello, What is the difference between standard and norm? Thanks im advance.
  8. RobertHasty

    PTFE tape or Copper washer

    Hi, When using connections for pressurized sir (e.g. male stud adapter) do you prefer to use PTFE tape as a Seal or Cooper washer?
  9. RobertHasty

    Accumulator maximum pressure & minimum pressure

    Hello, I have been looking into accumulator formulas and would like your opinion on it. Let's say I would like to use an accumulator to extract a cylinder at 100 bar. What would be in that case the minimum working pressure (P1) and maximum working pressure (P2). I'm guessing the minimum would...
  10. RobertHasty

    Beam stress calculation

    Hello, I need a help with my weld stress calculation. I have a rectangular tube supported by a rib. I have attached a hand-made drawing on the following link: https://files.engineering.com/getfile.aspx?folder=53fe3023-411a-4165-a80b-8727cfa904bf&file=Weld_problem.pdf I have a fillet weld...
  11. RobertHasty

    Flow divider with check valve problem

    Hello, Can anybody maybe point me to a problem solution which I have on an attached circuit. There is a problem occuring during lowering. We experience "load vibration" or check valves tilting. I assume that p.o. check valves aren't opening at the same time although we have a counterbalance...
  12. RobertHasty

    power control axial piston pump calculation

    Hello, I would like to read some opinions regarding extension and/or retraction time calculation of a hydraulic cylinder when using axial piston pump with power controller (e.g. Rexroth DFLR) . I have a pressure/stroke curve for a cylinder and a pump with fixed power value. How can I...
  13. RobertHasty

    Check valve in the return line

    Hello, could you please help me review this circuit? http://files.engineering.com/getfile.aspx?folder=c0f595de-85fe-4d93-b2ca-b15a75d9c85a&file=2013-01-13_Check_valve.pdf There's a 5 bar check valve in the return line. There's also a pressure switch set to 5 bar. What would be the purpose for...
  14. RobertHasty

    dual counterbalance valve

    Could You help me out with some thoughts regarding a dual counterbalance valve size? By looking at a datasheets from various manufacturer's, both of the CB's screwed in a dual housing are designed for the same flow. As far as I know, it's not good to oversize the CB valve. Therefore, I...
  15. RobertHasty

    draftsight pointer issues

    Hello, Can anybody advise me about pointer movement issues that I'm experiencing in Draftsight? The pointer is just "too slow", i.e. lags behind mouse movement. I've tried Tools>Options>User Preferences>Drafting options>Pointer Controls, but no success. Or perhaps I didn't find what to adjust?
  16. RobertHasty

    countarbalance valve with prv???

    Hello, I have a question regarding counterbalance valve. I've received a tip to install a pressure relief valve together with a counterbalance valve. So I'm wondering what do I achieve by that? Do I use a PRV next to the CB valve when it is set to high, i.e. higher than maximum cylinder...
  17. RobertHasty

    directional valve overlap

    hello, Does anybody know what kind of overlap do standard directional valves have if that is not specifically stated in a datasheet? Thanks.
  18. RobertHasty

    push pull type solenoid valve

    Hello, Does anybody know what does this term mean? by looking at a photo, It should be a spring centered, solenoid operated DCV with manual actuation. But what does this term push pull type solenoid valve mean?
  19. RobertHasty

    Filler Breather Size

    Hello forum members, I would like to know if anybody here is thinking whether their filter breather is sized correctly? Please share with me some guidelines when determining the size of a breather. Robert.
  20. RobertHasty

    Circuit opinion

    Hello, I would like forum members to give me some tips regarding my circuit. I have two cylinders that need to be synchronized. Each of them has a counterbalances due to negative load. Also, I need local (manual) and electrical actuation. Thanks in advance.

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