Questions tagged [hydraulics]

Questions about the flow and use of fluids.

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0answers
102 views

Head loss from rectangular slot orifice flowing up?

For sizing purposes I'm trying to calculate head loss for a level spreader outlet for water, where the water is being supplied from below by pressure. It's essentially a reverse slot drain—instead of ...
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2answers
75 views

Deriving the ideal equation for sluice gate problems - incompressible inviscid fluid

I'm trying to figure this problem out, i know the correct answer, and i know the method, but for some reason i'm missing something and i'm just not getting there, any help would be greatly appreciated....
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6answers
3k views

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

I'd like to create something similar to a hydraulic press. I know I need some sort of motor, but I was curious about a fundamental question about motors when used in a system where the force required ...
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3answers
185 views

Hydraulic linear actuators as CNC axis instead of screws

Lately I've been watching some videos on machining and hydraulics as it always interested me. I was toying with the idea of building a budget CNC mill with threaded rod for the axes, but the issue of ...
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1answer
85 views

Constant force opposing hydraulic winch

I have a situation that I am hoping to solve with the use of electric motors, and a variety of controls. I have a hydraulic winch which turns at speeds from 0-60 RPM. This winch is coiling and ...
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1answer
44 views

Low-Flow Nozzles for Corrosion Spray Testing

So, for a cyclic corrosion test system, I need a nozzle or arrangement of nozzles that provides a flow rate of 45ml-140ml of salt solution per hour to an area 60cm square. All commercial nozzles I've ...
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0answers
59 views

Static load analysis for four-bar linkage?

I am facing a difficult question and can't find answers anywhere else. What on the left is a hydraulic ram, it's pushing the box in the centre to move upward, while the four-bar linkage attached on ...
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1answer
2k views

Mechanism of a manual Crank Adjustable Height Standing Desk

I am trying to figure out the lifting mechanism of a manual Crank Adjustable Height Standing Desk. Please see the image below: My question is what it is inside the metal frame (check the red marked ...
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2answers
782 views

What is the difference between hydraulic and ABS brakes?

Recently I read an article about ABS brakes. In that, they repeated several times the term that traditional hydraulic brake replaced with ABS brakes. Why it so? The reason for choosing ABS is ...
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1answer
72 views

Help with simple hydraulic circuit to use for a four legged Robot

Firstly i am new to hydraulics, i want to build a hydraulic circuit that powers 4 cylinders at each leg of a Quad-Wheeled-Robot. The idea is to move the Chassis of the Robot up and down in all ...
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1answer
38 views

Can hydraulics be used with a squarish piston?

I'm designing a custom part that needs an active shock absorber and space is restricted. I most likely won't be able to use a stock absorber and was thinking, can two squarish tubes be made tight ...
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1answer
80 views

How are the modern hydraulic cylinders very precisely controlled?

My guess is that they use brushless Motors that in turn powers the hydraulic pump. But there must be some kind of valve that could help in the process. Still the burning question is just by adjusting ...
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33 views

water pump problems

I am presently facing a problem in water plant . In a tank there are four pump placed at equal distance named A B C D .in this arrangement A and D positioned at near corner of the tank . I started ...
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43 views

Deciding between Electric or Hydraulic Actuators for a Dynamic Load of around 4 kN to 6 kN

This is a project regarding linear actuators for a 4 Wheeled Robot, with spider like hinged legs. The first question on my mind was to figure out is if a hydraulic system has any weight to Force(...
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0answers
27 views

Static charge, PVC pipe and water

I know it's possible for a PVC pipe to develop a staic charge due to fluids flowing through them. This is a twist on that idea. Can a sealed length of pvc (say 3.5 feet in length) - tethered below ...
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0answers
30 views

Low pressure Diesel pumping with High pressure Gasoline pump?

We are in desperate search of suitable pumps for one of our applications. We need to be able to pump Diesel fuel in a range going from 5bars to 125bars. To do such thing, I've been looking at Bosch ...
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1answer
122 views

Determining the headloss according to Darcy-Weisbach with pipes in parallel and series

Given the following situation: Pipe A and B have a known and identical length and diameter, and are in parallel. I'm assuming the flow trough pipes A and B are also identical, as is the roughness of ...
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1answer
62 views

The mechanism of submerged hydraulic jump

Is there a mathematical analysis of the submerged hydraulic jump, such as under what condition it is formed, the speed and trajectory of the circular flow therein, etc.? Is there a good mathematically ...
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3answers
86 views

how are these radial piston rotors machined

A typical radial piston rotor can have simple holes machined from the outside through the inner diameter to create flow channels for hydraulic fluid to actuate the pistons. I came across this model ...
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1answer
30 views

Pressure delivered to an object under a pneumatic press

I'm hoping some kind person can tell me if I have this right or not. I swear this isn't a homework problem. I'll be using a heated pneumatic press to heat seal lidding to plastic containers (...
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2answers
217 views

What are the difference between open loop and closed hydraulic system?

I'm trying to get informative resource material through this.
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0answers
60 views

Hydraulic motor sizing

16 Examples of Tensile Strength has a list of items and their tensile strength. bamboo has these tensile strength ratings Bamboo MPA 350 PSI 50,763 If I needed to have a hydraulic motor to shred ...
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2answers
1k views

What is "water surface elevation" and "headwater"?

I want to understand the meaning of headwater, and I stumble across this page, and this diagram: This is where it got me. Headwater is defined as measured from the flow line (invert) of the ...
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1answer
66 views

Calculate Efficiency Loss of a Leak in a Hydraulic Cylinder

I am trying to figure out what the efficiency loss of a leaking hydraulic cylinder is. This master's thesis found that a controllable pitch propeller (essentially a hydraulic cylinder inside a ...
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2answers
374 views

Open Channel flow with pressure losses - flow depth?

In a horizontal channel that feeds off a river, does the head/pressure loss due to friction, turns etc in the channel translate to a drop in the water level between its inlet and outler? If so, could ...
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0answers
29 views

How can you calculate wear of steel pipe that is transferring sand laden fluid under pressure? [closed]

How can you calculate wear of steel pipe that is transferring sand laden fluid under pressure?
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1answer
189 views

Head loss curves for PEX tubing?

Is there a reliable online reference for head losses of PEX tubing at various nominal sizes and flow rates?
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1answer
169 views

Why does pressure during a hydraulic transient phenomenon like fluid hammer goes below the line pressure?

I am trying to understand why the pressure fluctuations during a hydraulic hammer phenomenon would go below the line pressure (Pmin < Pi) I thought there will just be a rise in pressure and then ...
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1answer
238 views

Low flow hydraulic motor to run high flow pump?

I would like to get some opinions on using a low flow hydraulic MOTOR to drive a high flow pump ? Would the high flow pump be able to create a useable pressure to drive a piece of equipment that ...
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1answer
44 views

Modeling Water Flow Through Saturated Medium

I am working on a project that uses a variable-speed pump to achieve a desired pressure across a medium (coffee grounds). The system includes a pressure sensor in-line between the pump and the medium. ...
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2answers
333 views

Calculate hydraulic torque from motor HP, hydraulic pump and gearbox

I am curious about the design considerations for a hydraulic system. Let's say you have a 3HP 1200RPM motor you also have a hydraulic pump that's rated 4LPM and pressure of 40MPA rated for 40RPM MAX ...
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0answers
43 views

Where to put the booster pump at customer substation in a district heating system?

In a district heating system, one of the houses in the distribution net is not getting the desired heat into their house. This is because the pipes of this customer which connects them to the ...
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3answers
86 views

How to make sure a pipe does not take all of the water from a stream?

I am trying to design a pipe which takes water from a river and transports it to a reservoir. However, I do not want my pipe to take all of the water from stream, because that will create all sorts ...
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3answers
104 views

What would a track in a culvert be used for?

A colleague works in a closed (no public access) watershed and came across this culvert today. These smooth "tracks" down the center of the culvert are something we have never seen before. Any idea ...
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0answers
34 views

Fluid for mechanical lubrication and hydraulic connection to plastic/rubber parts

I have a piston made of anodized aluminium and stainless steel with nitrile seals which I need to connect hydraulically to our system which mainly consists of silicone rubber with polycarb and acrylic ...
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2answers
805 views

pressure loss in a T fitting

For weeks I have been searching internet , but still unable to find answer , so here it goes: I have to calculate pressure losses in heating circuit , and am stuck at calculating losses in T fittings. ...
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0answers
134 views

Determining the Steady Discharge Between Two Reservoirs

A uniform pipeline, $5km$ in length, $100mm$ in diameter and with a roughness size of $0.03mm$, conveys water between two reservoirs. The difference in water level between the reservoirs is $...
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2answers
183 views

Is it illegal to use the hydrodynamic energy contained within the city water supply to generate electricity?

If someone were to invent a device that uses the hydrodynamic energy contained within the city water supply to generate enough electricity to reduce their monthly electric bill (however unlikely this ...
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0answers
25 views

Searching for a High Speed Actuator for a simulator

I am currently planing to build a consrtuction for a simulator. My simulator seat should be able to fall like 30cm and afterwards move to the starting position . The falling should be as natural as ...
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0answers
160 views

Analytical shape of a pump curve

I'm looking for a formula to arrive at a pump curve for a centrifugal pump: $H(Q, n)$ - total head delivered as a function of flow and speed (rpm), and of course some pump specific parameters. I find ...
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1answer
3k views

How do you interpret a pneumatic regulator symbol?

I'm an EE trying to interpret a pneumatic schematic and have a few questions regarding the symbols being used. I've come across two different regulator symbols (or so I believe them to be regulator ...
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2answers
46 views

Practical rugged method for elevating water 7 feet high? [closed]

At a very low-tech, rustic forest camp, I've built a 'water tower' connected to a gravity-fed water filter to provide something like a clean water faucet. It's basically a 5 gallon bucket on top of a ~...
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0answers
53 views

Difference between direction of ramming in hydraulic press?

In Printed circuit board/Plywood lamination Hydraulic Press machines (seen here). The ramming action comes from bottom in all the machines I saw so far. For such action from bottom, excavation has to ...
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2answers
428 views

What are the tradeoffs between using hydraulic motors and electric motors?

My limited understanding of hydraulic systems is that they aren't nearly as efficient as electrical systems, and that wire is cheaper than high pressure lines. Example: In a zero turn mower, each of ...
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2answers
479 views

What happens when pumps are blocked off?

What will be the result if the pipe losses is greater than head produced by the pump? What will be the result if outlet is closed?
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2answers
57 views

What kind of pressure switch can I use for pressures up to 5-10 tons/cm^2?

I need a pressure switch for an electric circuit that has to be closed once a piston is compressing at a pressure of (approximately as we haven't specified how much force we have to use, and maybe it ...
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2answers
54 views

Can I make check valve in simple workshop?

I need a check valve ( one way valve ) for my project which has less actuation force (IDK real term. shouldn't require high pressure for inflow of fluid) and I searched in market for the valve but ...
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0answers
34 views

The use of Theis equation based on time

The storage coefficient (s) for artesian basin can be determined by the following equation (Theis equation): $$s=\frac{Q}{4\pi T}\int_{\frac{r^2S}{4Tt}}^\infty\frac{e^{-u}}{u}du$$ Does this ...
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1answer
65 views

What (if any) are the engineering limitations for producing "simulation" exoskeletons

To clarify the title since it cannot be said within the word limit: A "simulation" exoskeleton, is an exoskeleton that doesn't exist to support a disabled user's movement or to help someone carry ...
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0answers
23 views

Determination of delivery pressure from pump in my Parts Washer

We want to know how can we determine the pressure of the liquid at the delivery end of the pump. We have a centrifugal pump and a 2" pipeline at the delivery end. Pump delivery performance as per ...