Jeremy Beale
  • Member for 2 years
  • Last seen more than a week ago
  • Blacksburg, VA, USA
Why do hydraulic systems use special fluid - what's wrong with water?
4 votes

In addition to the other answers, water is commonly used as a primary working fluid in industrial hydraulic systems with additives to prevent the issues mentioned above. Typical applications include ...

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hydraulic Motor/pump minimum speed
Accepted answer
2 votes

Torque will drop off with speed for the Brevini external gear motors in your datasheet (OT200 series). Unfortunately Brevini doesn't publish torque / speed curves below 1000 rpm. Here is a comparable ...

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Rotating Swashplate on Piston Pump
Accepted answer
2 votes

Here are two categories of pumps with non-orbiting pistons: Axial piston pumps with rotating swash plate. Operating principle at 0:48 - https://www.youtube.com/watch?v=sP3gc4b8Z5k Commercial ...

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Swash Plate Pump Design
2 votes

Following up on Sam's categories of pumps - There are industry examples of your first category - rotating swash plate + stationary barrel pumps. Here is one animated example of a pump that I've used ...

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HPU minimum oil temperature
1 votes

The pour point of standard ISO32 hydraulic oil is around 40F (4.5C) depending on additives. Below that temperature the oil behaves like a semi solid rather than a linear-viscous fluid. Forcing the oil ...

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Running Hydraulic Pump with High Torque Motor
1 votes

The short answer is - always verify power AND torque for any system. Then you never have any surprises. Pete's guess on speed (1000 rpm) is in the ballpark. Most hydraulic gear pumps/motors have a ...

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Hydraulic system dynamics modelling
1 votes

If inlet flow = outlet flow, then your system will quickly reach a state of equilibrium. The pump spins to transfer fluid from node 5 to node 1. There would be some minor pressure difference due to ...

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Circuit to provide position control for double action hydraulic actuator
Accepted answer
1 votes

The pneumatic circuit in your question provides simple start / stop control of the piston. While the 5-port valve is opened you have full flow in either forward / reverse directions. Your control ...

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Hydraulic energy recovery for high-pressure, low flow (non-steady state) conditions
1 votes

My perspective - Phil's point should be considered first. The amount of energy available to recover is probably small relative to the cost of energy recovery equipment. However there are special ...

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Running a hydraulic pump below minimum RPM
1 votes

Technically pumps only control flow, not pressure. You probably understand this but I want to explain for anyone new. Couple of examples to show the point - Running the pump with the pump outlet open ...

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Effect of flow through a static hydraulic pump on its RPM
1 votes

First I would state the question differently. What happens when there is a negative pressure difference across an unpowered hydraulic pump? This is actually a common situation occurring when a pump's ...

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Replicate stepper motor with gasoline engine
1 votes

A hydraulic solution should work fine. You can control the start / stop motion with a 4-way valve like this: The default valve position sends oil back to tank. Shifting the valve right / left gives ...

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Need help identifying component on hydraulic schematic
1 votes

Symbol 23 is just a plugged cavity. The two incoming hydraulic lines are both blocked. No flow is exchanged between them. The designer's intent for the cavity is future use. Various cartridge valves ...

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Low flow hydraulic motor to run high flow pump?
1 votes

Great question with many potential applications. The short answer to your question is YES. A hydraulic motor can absolutely be coupled to a pump in a useful way. You would effectively have made a ...

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Calculate hydraulic torque from motor HP, hydraulic pump and gearbox
0 votes

To summarize your problem description, you have ... 3 HP, 1200 RPM electric motor 40 MPa (400 bar) pump rated 4 LPM @ 40 RPM Gearbox ratio TBD between motor and pump Desired operation of 20MPa (...

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Does a motor suffer damage when resistance to the intended motion is met?
0 votes

On a typical hydraulic press, there is negligible danger of motor overloading. However your instincts are correct. Consider the operating sequence of a press. An electric motor drives a pump. The pump ...

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