Questions tagged [hydraulics]
Questions about the flow and use of fluids.
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Reduced flow rate due to Hydraulic effects
Can anybody help me with papers or studies on reduced flow rates when pumping fluid through multiple pipes in a network due to hydraulic effects compared to those achievable when operating ...
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Are there hydraulically actuated pneumatic valves?
I am working on a hydraulic system that is powered by an air-hydraulic piston pump, the pump uses pneumatic pressure to drive a piston which then pressurizes the hydraulic system.
The system needs to ...
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How Can I do punching of 0.22mm in stainless steel sheet (Sheet thickness 0.5mm)
Wanted to press punching of 0.22mm dia (Bottom) and on (top) 0.6mm dia
Please suggest how can I make such die?
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Stop Spa-to-Pool Siphoning Thru Spa Pump
I have a partially above ground Spa and an in-ground pool. When the spa is filled to spillover with pumps off, water siphons through the spa pump and into the pool until the spa water level drops ...
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Can a compressor give the same discharge pressure even if suction pressure varies?
The task is to maintain compressor discharge pressure at 200 bars. The inlet pressure varies with time from 200 bars to 10 bars (emptying a compressed air tank and compressing to transfer it to ...
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How to get this hydraulic system working and help identifying parts and their function
I have recently acquired a 1982 Arburg 220-90-350 injection moulding machine, mainly just as a hobby to further my knowledge on injection moulding machines and control systems as I plan to modernise ...
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Computing the velocity of water under reverse flow conditions from storm water drain
I am trying to compute the approximate velocity of water during reverse flow from the outfall location to the street through storm inlets. This is generally seen during what is commonly referred to as ...
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On a Diesel/hydraulic DMU train what exactly does the “go faster” lever control?
Let's say that you are driving a Diesel Multiple Unit† with either mechanical* (i.e. an actual gearbox with multiple ratios) or hydraulic (i.e. two or more torque converters) transmission. When you ...
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How to transfer high pressure hydrogen using flexible pipes?
The task is to transfer hydrogen (high pressure gas > 400 bars) from offshore platform to land. To do so we have to use flexible pipes but for high pressure and high flow rate I'm afraid we can't ...
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Estimating circular pipe flow velocity through a known elevation profile and known length with a known initial pressure and flow velocity
I have a known elevation profile spanning the length of my pipe (~600 meters). An elevation value is given for every five meters of pipe. At the beginning of the pipe, I have a known velocity (1.1 m/s)...
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Hydraulics sluice gates and hydraulic jumps
I was wondering if anyone has an understanding on hydraulic jumps and sluice gates?
Why can you only use the energy equation for before and after the sluice gate? Why not at two points after the ...
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Hydraulic system single-action and double-action
I am looking at purchasing a hydraulic cylinder and a 12volt DC pump and motor to go with it. The pump and motor state that it is a single action pump, the cylinder mentions that it is double action, ...
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Compression ferrules for bicycle hydraulic brakes
Between working on my and my girlfriend's bikes, I've come across different style compression ferrules (aka sleeves/olives) used in the hydraulic brake systems and would like to know:
What is the ...
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Estimate cycle of the pump per day
I have a pump system that is on for 5 days. For the entire 5 days, there are 3 days that the pump system is able to complete on and off cycle.
I want to estimate the cycle of the pump (on/off) per day?...
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Calculating Minimum Pipe Pressure Requirement for an Irrigation System
I am setting up an irrigation system for my ranch and I have a hard time calculating the minimum pipe pressure requirements to reduce cost. I need to know the maximum pressure the pipe has to cope ...
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What is the side way force on a flat membrane place perpendicular to the flow of current on one side, and stagnant water on the other
So basically imagine a plate being placed parallel to the direction of flow of water with water flowing with a certain velocity on one side of the plate and on the other side it is almost stagnant. ...
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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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Hydraulic circuit part question [Blanking Cartridge]
There is a part in this circuit called a "Blanking Cartridge". Its symbol looks identical to a standard capacitor in electrics. I have no idea what this part does. It is connected in ...
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What would prevent me from using this valve for water?
https://www.kingstonvalves.com/product/ksv25cr-stainless-steel-asme-soft-seat-safety-valve/
Looking to use this for water instead of air. I haven't seen a good reason not to as the physics of the ...
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Can a design where syringes draw and push water to manipulate buoyancy be classified as a buoyancy engine?
Beginner question here:
So my partner and I are trying to design a buoyancy engine where a motor operates a ball screw that draws and pushes syringes in order to draw and push water in the syringes(...
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What's the hydraulic loss of this overflow?
Consider the following image:
what we see is are upright pipes into a water vessel, upper end of the pipes above the max. water level. Water is pumped into the pipes from below. We need to consider ...
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What are the Units of flow coefficient Cv? And relationship between flow coefficient Cv formulas of incompressible and compressible fluids
I tried to understand flow coefficent Cv of a valve. There are many similar discussions on the Internet, e.g.,
https://www.pneumatictips.com/what-is-the-flow-coefficient-cv/
There are two formulas for ...
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Solenoid Valve Resistance
This is basic but will a DC solenoid have 0 Ohms impedance when energized? For example, a valve in the closed position with 24VDC applied to the solenoid. Don't inductors have zero impedance for ...
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How do centrifugal pumps connected in series increase head?
I've read that if you connect two identical centrifugal pumps one after another, the head of this system would be twice the head of a single pump. I have some difficulties understanding the processes ...
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How to build a hydraulic standing desk?
I am trying to build a standing desk but I want it to be wireless (aka - no electricity needed).
My idea is:
have 4 hydraulic pistons that extend (from 60 cm (25in) to 120 cm (50in)).
They will be ...
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Volume multiplying hydraulic pressure reduction unit?
I'm tying to figure out what something is called, assuming it exists at all. If I knew what to search for, I'm reasonably sure I could figure out which part would be suitable for the application, but ...
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Effect of pump suction lift on pump vibrations and motor current
Consider the case of an electric motor driving a centrifugal pump.
The pump is installed above the tank.
In Case-I, the tank is completely filled with water.
In Case-II, the tank is emptied and thus ...
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Are there hydraulic torque converters that are specifically built to work like reduction gearboxes?
As far as I understood from this video, there are torque converters and fluid couplers (a hydraulic clutch), but certain types of torque converters kind of work by performing the two functions at ...
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Would connecting a small hydraulic pump to a larger hydraulic motor result in force multiplication?
In a hydrostatic transmission system, hydraulic pumps drive hydraulic motors (basically a reverse pump).
If you were use a smaller hydraulic pump as an input and a bigger hydraulic motor as the ...
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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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Are two forces required to cause shearing?
If we have a fluid, is one force acting along the surface of it enough to cause sheering? In most diagrams I see for real Newtonian fluids they show two forces of equal magnitude along the top and ...
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Why did pressure decrease above the piston?
I can understand the pressure increase below,but why did pressure decrease above as more bricks were added?
Image source: https://www.youtube.com/watch?v=4REdJIW6-Kg
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Pumped storage hydropower, how to power the pumps?
Regarding pumped storage hydropower,
In the case of some high altitude upper reservoir that feeds several turbines located at the bottom of a valley, where there's a lower reservoir too.
Assuming in ...
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How does the hydraulic valve system work in excavators?
There are many types of valves used in excavators. Two are important: the main valve and the pilot valve. Is the pilot valve is controlled by the operator and the main valve is controlled by the pilot ...
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How many pistons are used in Excavator Engine and how they coupled with pumps?
As I am examining the components of a Caterpillar 323D hydraulic excavator, I would like to inquire about the specifics of its diesel engine. Can you provide information on the number of pistons and ...
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Understanding continuity equation
The volume for an open tank is given:
<$V = L \cdot L \cdot h(t)+ h(t)^2 \cdot tan(\theta)$>
Where h is the volume of the liquid within the tank.
I want to calculate the change in height as a ...
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Design a manifold block and calculation of pressure drop
How to calculate pressure drop inside a manifold block with different pipe sizes for one connection to another. Overall the manifold block maximum working pressure is 10 bar. Can anyone send me basic ...
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Is there a way of find the ideal balance between pressure and fluid flow in a hydraulic system?
So, I have 72 hydraulic McKibben actuators with 30cm in length and 14cm in width under 400 kPa (or 4 bar) that lifts a 5 ton weight that I want to actuate in a third of a second (continuously, ...
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Recommended books for calculations in hydraulic and pneumatic systems
I'm starting to learn about hydraulic and pneumatic systems. Although I have some idea of the basics, I would to dive deeper into the field.
Are there any books on hydraulic or pneumatic systems, ...
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Why would the compressor provide more pressure than necessary? Isn't the pressure determined by the resistance?
I clearly misunderstood something
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Boundary layer thickness decreases as fluid velocity increases, so why is the boundary layer thicker in the turbulent region for higher velocities?
I am modelling transitional fluid flow over a flat plate, and investigating the effects of free stream velocity on boundary layer thickness. From what we have been told, increasing free stream ...
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Input power unit for Heavy Duty spool hose
I'm trying to design a machine for spooling a hose at a mining application.
Considering all hose length, mass, spooling diameter and pump the peak torque would be of To = 10267 Nm.
It sounds a lot but ...
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Do 6/3 proportional valves like this exist?
Like a directional valve but used to select either pair of supply and return. Could be done with two regular 5/3 valves, but it would be nice to use only a single valve. Does something like it exist?
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How does high inlet head affect outlet head on a fixed speed centrifugal water pump
I am curious to know what happens to a fix speed centrifugal water pump's outlet head if the inlet head is already relatively high.
For example, say a pump is said to have a max head of 10m. If it is ...
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Hydraulic Brakes - Why motorcycle brakes more powerful than bicycle brakes?
I was wondering why motorcycle brakes have so much more stopping power than bicycle hydraulic brakes (Than can be found on mountain bikes for example).
The rotor has a bigger size which gives better ...
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Any scientific research papers on electromagnetic active valves using variable viscosity electromagnetic fluids?
I know the title is quite a mouthful, but let me explain (also, I couldn't find anything on the subject, maybe because I'm using the wrong words).
I saw some time ago a video about a variable ...
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Does this exist - Water flow control with energy recovery
Classically, if you have free flow (high level to low, no pump) between two vessels you want to control you use some restricting orifice, or flow over a variable height weir. Both dissipate energy.
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Do excavators use electronic joystick and solenoid valves for direction control?
I studying how flow control happens in excavators. I came to know that the low pressure pilot line is used to control the high pressure hydraulic flow control valve (pilot operated direction control ...
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Confusing terminology for "normally closed/open" - It means the opposite in electronics (relays) versus fluids (valves)
I'm an electrician and "normally open" / "normally closed" is well known to me. I recently started to also work on heating systems including the pneumatic system that controls some ...
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How to divide the water flow into pipes with equal flow each from a free surface?
From a free surface pond, I'd like to divide the outflow into two separate pipes and direct them in two different places. Each outflow has to be equal.
Do you have an idea ?
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