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  1. akkamaan

    Adding load sense to a plain valve

    I have put together a more complete schematic for 1 of your 2 directional valves.. You can take the main pilot pressure supply via a T from the pump pressure line and a pressure-reducing valve. 25 bar should be an appropriate pilot pressure. Make sure the pumps' stand-by pressure is at least...
  2. akkamaan

    Adding load sense to a plain valve

    Your second task is to control the solenoid loading valve. If your posted drawing is correct, your directional valve is controlled with a variable hydraulic pilot pressure, approx 0(5)-15 bar. That means you will need either 1. A hydraulic pilot joystick valve. (common on excavators. With this...
  3. akkamaan

    Adding load sense to a plain valve

    I am not sure the author is focused on "true LS", since he seems to be concerned about the standby pressure and how to unload the pressure-compensated pump With pressure-compensated pumps, we have 3 different "common" systems. 1. "True" Constant Pressure, CP, system 2. Unloaded Constant...
  4. akkamaan

    Hydraulic Cylinder Controls

    10x2.5x2.5xpi/4=49.1 cui
  5. akkamaan

    Cushion Cylinder design

    As some others say, it is hard to understand your idea exactly. But here is my interpretation... The way you have drawn the schematic the needle valve fills no function. I assume you have put the needle valve there to control flow from the capped side to the rod side. That won't work since oil...
  6. akkamaan

    Constant LS pressure at no load

    This is just an attempt to shed some light on how an LS system works. LS pressure is supposed to be 0 (zero) if no hydraulic function is activated. The pump goes down to a standby mode at a low pressure. That pressure setting can vary depending on the type of machine. Approx 35 bar sounds...
  7. akkamaan

    Ask for a name of a pneumatic symbol

    Motorized ball valve. Usually used for on/off control of liquid flow Link Mobile Hydraulics
  8. akkamaan

    Hydraulic symbol identification needed, please.

    Mobile Hydraulics
  9. akkamaan

    i have a hydraulic motor with attac

    I would help a lot in a opening post by telling us what type of application this is about. So the brakes are applied mechanically with a spring? As I understand you the brake release pressure is supposed to not exceed 30 bar, right? And the rest of the hydraulic system has a higher max...
  10. akkamaan

    Volume Flow Rates in and out of Double Acting Cylinder

    This flow intensification/FI Jacc mentions happens on differential cylinders capped side when retracting the cylinder. That means that we get x% higher flow returning from the capped side than the pump flow entering the rod side. A normally designed hydraulic differential cylinder has a capped...
  11. akkamaan

    Volume Flow Rates in and out of Double Acting Cylinder

    If you have a double action DIFFERENTIAL cylinder and supply 10 L/min to the capped side it will come out 10 L/min from the rod side. But the 10 L/min from the rod side is the sum of oil volume and rod volume. Accordingly, if we reverse the direction of travel and supply 10 L/min to the rod side...
  12. akkamaan

    Using a pneumatic cylinder or syringe to compress air and move a payload very fast

    The difference between your concept and the airgun is that in your concept you store the energy in the compressed air and in the air gun the energy is stored in a compressed spring. And the spring pushes the piston that compresses the air when shooting the pellet. The stiffer spring and the...
  13. akkamaan

    Hydraulic flows

    Are all these hoses and fittings in series? What are the cylinder diameter dimensions of the piston and the rod? If more than one cylinder actuator, are they operated one by one individual or several of them simultaneously? Is this a fixed displacement pump or a variable displacement constant...
  14. akkamaan

    Bud Trinkel's Hydraulics books

    Flow doesn't make the motion. Flow is motion. Force makes the flow and the motion. Pressure is just another way to express force...
  15. akkamaan

    Hi Everyone, Can somebody from thi

    Here is an article that briefly explains the pump https://www.dekkervacuum.com/resource-library/knowledge-database/principles-of-operation/two-stage-liquid-ring-vacuum-pump/
  16. akkamaan

    Adding to the hydraulic system

    why a hydraulic powered air compressor? I understand you are in need of compressed air. But pneumatic systems most often run intermittent, intermittent use, and intermittent air supply to a pressurized air tank. Also, pneumatic systems are not really a good choice for high-power applications. So...
  17. akkamaan

    Converting a Variable Displacement System to Fixed

    I agree that it is a Q from someone that does not know a lot about hydraulics in general. That's why I tried to lay out some explanation "cards" about how these pumps works And this question shows the ignorance So before we actually know exactly what OP thinks is possible to accomplish we need...
  18. akkamaan

    Converting a Variable Displacement System to Fixed

    This is how the pump manages the pressure with the compensator Disconnect the compensator and plug the ports/holes in the pump housing and the pump can't destroke
  19. akkamaan

    Converting a Variable Displacement System to Fixed

    A system with a variable displacement pump has a directional valve system with a closed center. IF you want to convert it to a fixed displacement pump you will need a directional valve with an open center so the entire pump flow can be dumped or by-passed to the tank when no hydraulic function...
  20. akkamaan

    Simple hydraulic cylinder keeps retracting (gradually) after pump is turned off, agaist load.

    What are the inside cylinder diameter, the piston rod diameter, and the length of the piston stroke? What is the pump pressure to lift and hold the elevator cabin? How far away is the pump unit (the directional valve) from the cylinder ie the length of the hydraulic line? What is the inside...

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