Questions tagged [valves]
The valves tag has no usage guidance.
104
questions
0
votes
1
answer
42
views
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 ...
- 109
0
votes
2
answers
29
views
ELI5: How does this water (solenoid) valve work?
I took apart this hose faucet timer:
When unpowered the valve is closed. When powered (either manually or by timer) it opens allowing water to flow through. I am attempting to learn how the open/...
- 103
0
votes
0
answers
14
views
Mechanism of erosion in control valve flashing
My background is analytical and theoretical chemistry, but now I work as a data scientist in the oil and gas industry, working with operations data. The phenomena of cavitation and flashing erosion ...
- 101
0
votes
1
answer
58
views
What are the issues with this ICE design?
Elaborating along this previous question, could you please invalidate this ICE design with solid authoritative arguments explaining all the flaws?
Starting hypothesis:
Whatever the purpose, one single ...
- 228
0
votes
0
answers
51
views
Examples of Internal Combustion Engines with one valve inside the piston?
I'm searching for examples of production internal combustion piston engine, 4 stroke cycle, 2 valves per cylinder, with one inlet valve inside the piston, and one exhaust valve at cylinder head.
Only ...
- 228
0
votes
1
answer
26
views
User-settable pressure-relief valves for outdoor domestic water supply lines?
Is there such a thing as a pressure relief valve which can be attached to garden hose bibb threads that would relieve backpressure from a pressure washer, in order to protect old pipes and reduce the ...
- 205
1
vote
2
answers
50
views
Is there anything close to automatic shuttle valve?
I am building a pneumatic system that needs an automatic shuttle valve. That means if I apply air pressure on one of the inputs In1, it closes the other input In2 and creates a path between In1 and ...
- 11
1
vote
1
answer
32
views
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 ...
- 31
0
votes
0
answers
23
views
Diesel fuel valve outdoors: Gate, Globe, or Ball?
Real world question: We need to replace an internally failed (cannot shut) gate valve installed as a shut-off valve on a 2" Diesel fuel line exposed to weather (roof top) and operating at less ...
- 223
1
vote
2
answers
70
views
How does this transmission valve "hydraulic computer" work?
I just came across this:
The claim is that it is a kind of analogue computer. But I don't see any moving parts. How does it work?
EDIT: If someone could draw lines on the diagram to illustrate, that ...
- 131
0
votes
1
answer
43
views
Is there a pressure check valve that doesn't bleed the excess pressure?
My issue is that downstream, I have a boiler making pressure at 10.54 bar and upstream I have a system that must NOT be heated at any point beyond 130 °C. My plan is to make sure the system pressure ...
- 103
0
votes
0
answers
17
views
Question about cooling load, superheat, sensing bulb and the method that decrease the pressure in the thermostatic expansion valves
I must say I am the new guy in the engineering, so there are some proper noun or common sense I don't understand, hoping someone can teach me, I have two questions below:
I have searched for ...
0
votes
1
answer
27
views
Solenoid valve that does not restrict air flow when open [closed]
I wonder if such a valve exist - a cheap solenoid valve that when open does not restrict air flow?
I've only found solenoid valves for compressed air, although the opening may very (4-12mm) there is a ...
- 103
0
votes
3
answers
46
views
Releasing compressed air with the loudest pop
Due to the dry summer I've been thinking about theory of making cracker/banger without fire. Would connecting a nozzle (de Laval?) to quick release valve from small cylinder with the pressurised air ...
0
votes
1
answer
31
views
Plug valve problem
A pig is a solid plug that is introduced into the pipeline to be serviced. Fluid is pumped upstream of the pig to provide the necessary force to set the device in motion, and to perform
the desired ...
0
votes
1
answer
25
views
How would a gas flow switch react to falling pressure in the gas supply?
There's currently an ongoing discussion (not decision!) in Germany if households could be cut off from gas supply come winter, to make more natural gas available for industry. Of course media is full ...
- 4,661
1
vote
0
answers
25
views
Understanding flow curves of an hydraulic directional proportional valve
In the picture below you can see the command signal to flow curves for a proportional valve I'm using. Since I'm using it to control the speed of a cylinder I was looking at the looped flow path ...
- 151
0
votes
2
answers
68
views
How to connect a 1/4 NPT pressure gauge to a schrader valve while being airtight
I need to attach this pressure gauge - https://www.amazon.co.uk/gp/product/B07CXM3ZGT/ref=ask_ql_qh_dp_hza - to a schrader valve with a pipe to measure the pressure.
The valve has a 1/4 NPT thread. I ...
0
votes
2
answers
24
views
Can you make a simple hand-operated pump using two check valves?
question is basically the title. I was wondering if it would be possible to connect a check valve on each end of a squeezable bladder in order to make a simple pump.
The purpose would be to make a ...
- 1
0
votes
0
answers
22
views
What is the lowest energy solution for emptying a drip irrigation water collector : a mono-stable solenoid valve or a bistable coupled to a pump?
I have a water collector I want to empty everyday for drip irrigation. It is controlled by a micro-controller. I have identified three solutions:
Use a bi-stable electro-valve and a pump: advantage ...
- 101
0
votes
2
answers
81
views
Relief valve for "semi-closed" loop system (non-engineer warning :-)
My excuses in advance for the probably-bad wording of the question, I'm just an hobbyist without much knowledge in engineering. To the point I can't google for information on my problem since I don't ...
- 1
0
votes
1
answer
31
views
Can flow rate of a small gas flow be controlled by a valve that is opened and closed rapidly in a certain frequency?
Can flow rate of a small gas flow be controlled by a small solenoid valve that is opened and closed rapidly in a certain frequency?
0
votes
1
answer
407
views
Head loss coefficient for a valve with respect to both the open position and flow rate
This question talks about the head loss coefficient for a valve, i.e., $K_{L}$ for $h_{L} = K_{L} V^{2} / 2g$ where $h_{L}$ is head loss.
First, head loss coefficient for a valve with respect to the ...
- 111
3
votes
2
answers
161
views
Why do pneumatic valves need both a Safety Relay and an Air Dump to be safe?
If air dumps safely release pneumatic pressure from an industrial machine when an E-Stop is pressed, why is it also standard practice to cut electrical control power from the valves with a safety ...
0
votes
1
answer
51
views
Is there any way to quantify the rate at which pressure is relieved in a reactor?
If a pressure relief valve is open, is it somehow possible to quantify the rate at which the pressure in the reactor will decrease?
- 3
0
votes
0
answers
45
views
Which of these systems should reach a better vacuum?
I'm trying to find a cheap manual vacuum pump for a sample transportation container that carries oxidizable samples of thin-film magnetic materials.
They already have a 15 nm Tantalum layer on top, so ...
- 121
0
votes
1
answer
34
views
Is there a valve that will only open when input pressure is above 3 atm including when the downstream pressure is also 3 atm?
I want to use an external gear pump to pump air into a combustor at a design pressure of 3 atm.
Unless i use a valve that opens at threshold pressure there is no compression - the air exists the pump ...
- 368
1
vote
0
answers
31
views
Valve solution for mixing external air into a closed loop climate controlled air circulation system
I'm looking for an electronically controlled air valve solution which would provide a way to mix external air into a closed loop air circulation system used for climate control in an enclosure. The ...
1
vote
0
answers
43
views
What's the name of the valve that opens once pipes are mated?
I am building a wastewater system for my van (ie low pressure) and would like removable tanks for ease of emptying. I can shut off the inlet but would like to be able to drop them and automatically ...
- 171
0
votes
0
answers
35
views
Controlling flow through an output pipe
I wish to limit my flow through the output to a certain exact value. In this case to 10 lpm, what method or valve can I use to this task?
At the moment the flow keeps on fluctuating between 10.1-11.2 (...
0
votes
2
answers
78
views
How to simulate open and close and control valve using a simple controller
I have successfully developed a mathematical model for my physical system. My objective is to control the mass of gas in and out of the system.
The mass flowrate is given by:
$V_f = C_d.\sqrt{2.\frac{\...
- 33
1
vote
1
answer
477
views
What kind of solenoid valve should I use for vacuum?
I'm currently working on a project in which I have to control 2 solenoid valves with arduino to switch the suction of a vacuum pump from one tube to another one (tried to explain it on the photo), I'...
- 13
0
votes
1
answer
82
views
Valves and plumbing size
I'm building a liquid rocket engine and we're using kerosene and oxygen as our propellent. Now my question is what pipe size should we use? My flow rate for kerosene is 0.160 Liters per second and we ...
0
votes
0
answers
75
views
Selecting a water pump for low flow and 1 Bar pressure
I am designing a small automatic drip irrigation system. There will be about 10-15 drippers. Flow through the system will be about 1 l/minute, but this may change if expanding or reducing the system. ...
0
votes
0
answers
31
views
Approximating volume flow based on valve opening
I want to approximate the volume flow going through heating/cooling units, but all I have are valve openings (unit=%). Since the valve does not have a linear relationship between its opening and its ...
- 101
0
votes
0
answers
26
views
Pneumatically operated three way valves
I basically need to replace these valves with a modern equivalent
It’s a pneumatically actuated three way valve for high pressure and flow rate (200 bar, 50 liters/minute). The liquid is basically ...
- 129
1
vote
1
answer
131
views
Can air flow occur in both directions in a 2 way solenoid valve?
I'm designing a system where I need to fill and exhaust air from an an air bag. The air will be supplied from a dc motor. As of right now I've been considering placing a 2 way solenoid valve for air ...
- 11
4
votes
0
answers
204
views
Part to pierce the valve on a 16g CO2 cartridge and connect to a Solenoid valve
The specific part that I’m after is something that can connect to a solenoid valve and a CO2 cartridge that will break the seal on the end of the CO2 cartridge.
The solenoid valve connection is ...
0
votes
0
answers
47
views
Is there a valve design or system that can do this?
I am trying to come up with a way to bleed air from a tube to avoid air (gas) from reaching the other end of the tube. Is there a way to do this automatically? It must be able to work in all ...
0
votes
1
answer
50
views
0 energy one way valves [closed]
Is there such thing as a check valve that takes no energy from water for water to pass through? What is the name of this/these check valve type/s? I barely know anything about engineering, just have ...
user29169
2
votes
2
answers
23
views
Does it make sense to have a pressure and flow controller on a single closed line?
I have seen P&IDs in which a single line has both a pressure and flow control valve. Based on my understanding of Bernoulli's equation however this doesn't make sense to me - because ultimately ...
- 121
-1
votes
3
answers
91
views
How can I keep my soda bottle at atmospheric pressure while dispensing the liquid via a sealed system pump?
I am making a "bar bot" and I am trying to figure out a way to dispense soda without it going flat. I am using a bunch of peristaltic pumps:
Which luckily remain sealed at rest. I was ...
- 107
4
votes
2
answers
95
views
Divide Flow and Maintain Pressure
Im in the process of building an espresso machine from readily available parts. I have a solenoid pump that supplies pressurized hot water to the coffee grounds. I want to be able to tune the pressure ...
1
vote
0
answers
39
views
maintenance of steady flow through pressure or mass flow
let's say I have two points in a line, A and B. Between them there is a valve that can regulate the amount of the stream from A to B. Considering that there is a steady flow of the stream between A ...
- 21
1
vote
3
answers
313
views
Is there a type of check valve that allows gas to flow in both direction but stops liquid from flowing back?
I have a pressure regulator to maintain a specified pressure in a vessel that also contains a liquid. The regulator can pressurize or relieve pressure of the vessel. I want to prevent the liquid from ...
- 11
3
votes
1
answer
48
views
How to periodically shut down a recirculating hot water solar thermal system
I am posed with a scenario where a hot water solar thermal system has been setup. The system comprises of a cold water tank, heating arrays and then a hot water tank. The system is closed loop and ...
- 131
0
votes
0
answers
180
views
Using one electrical pump for multiple hoses
I'm currently trying to figure out a cheap way to build a cocktail machine.
For now the machine should have about 20-30 possible input liquids. These liquids should remain in their original bottle ...
- 109
1
vote
1
answer
4k
views
How to inflate or deflate a bouncy ball that lacks a standard valve?
I found this bouncy ball in my garage. It is too deflated to use and too inflated to store, so I would like to inflate it or deflate it. It doesn't have a standard valve for a bike pump: the only ...
- 161
0
votes
0
answers
45
views
Equation to calculate flow rate
Assume you have a solid walled sphere with an opening of diameter x. The sphere has volume 0.02 litres and has air at 1.4 bars.
What general equation would be appropriate to correctly size the ...
2
votes
1
answer
81
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 ...
- 35