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Questions tagged [valves]

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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 ...
Oliver Nicholls's user avatar
2 votes
0 answers
88 views

What specific characteristic of proportional solenoid valves makes the flow to current behavior quadratic?

If experimental data is obtained from a proportional solenoid valve, specifically flow vs current (assuming inlet pressure is constant), the fit is nearly quadratic in nature. Andersen's Analysis and ...
docscience's user avatar
1 vote
2 answers
68 views

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 ...
Jirhska's user avatar
  • 111
1 vote
1 answer
64 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 ...
David's user avatar
  • 31
1 vote
0 answers
40 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 ...
Landau's user avatar
  • 151
1 vote
0 answers
37 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 ...
Element Green's user avatar
1 vote
0 answers
45 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 ...
Mike's user avatar
  • 171
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 ...
ptqm's user avatar
  • 21
1 vote
0 answers
25 views

Valve advice for chiller test rig

I am in the process of designing a chiller test rig, of which a very simplified diagram would be (the quick coupling might just be replaced by a non-return valve): I am struggling to find the type of ...
am304's user avatar
  • 1,841
1 vote
0 answers
28 views

Is this Proportional Electro-pneumatic valve a direct replacement for other valves listed?

In the midst of trying to redesign the pneumatic subsystem of a combined system, I'm at the point of validating a new valve would serve as a direct replacement. The reason for the redesign is an ...
Drunk Cynic's user avatar
1 vote
0 answers
59 views

Liquid phase gas flow through valve

I have been trying to figure out how to calculate the required dimensions for liquid phase gas through a solenoid valve. Many companies (Swagelok, Bürkert, Asco) provide "Flow coefficient calculators" ...
Isth's user avatar
  • 11
1 vote
0 answers
1k views

Best types of valves for dirty services

I've just started to learn Gate, Globe, Ball, and Butterfly valves. I'm thinking about "dirty services" now. Which types of valves are most suitable for dirty services, and what characteristics ...
user307640's user avatar
0 votes
0 answers
18 views

Help identifying a source for medical/bioprocess rotational pinch valve

I am attempting to identify a type of pinch valve that I have seen used in a few different bioprocess and medical blood/fluid perfusion systems. The valve appears to be actuated by a stepper/servo ...
Bortamus's user avatar
0 votes
0 answers
22 views

Can the debris found in seawater compromise the sealing of a subsea check valve?

In the event of a subsea check valve opening and debris lodging in the region where sealing takes place, could that make the valve not close when it should? Would that happen to debris of any size? If ...
Lucas Cruz's user avatar
0 votes
0 answers
18 views

Why isn't my valve controller not providing sufficient amount of voltage to my fan?

We're using the valve controller below to control the speed of a (generic) fan: https://products.axiomatic.com/viewitems/valve-controls/can-to-4-outputs-valve-controller Problem: We're supplying the ...
tadm123's user avatar
  • 103
0 votes
1 answer
25 views

Operating a latching 24V DC valve with non-reversible current direction signal

Most 24V DC latching valves require a reversal of the current flow direction to be able to switch between open/close states. However, is there a way to operate them with a signal that can only go 0V ...
Noideas's user avatar
  • 11
0 votes
0 answers
71 views

Normally open check valve

What I'm looking for is basically an always open check valve that closes at a certain pressure. ~5psi. The application is a breather vent that closes if the valve is submerged in water. Would a biased ...
user43508's user avatar
0 votes
0 answers
50 views

Why no lever tools were used during manual valve opening attempts in Fukushima Daiichi?

I watched a PBS documentary https://youtu.be/qRKScRgsUaE and Netflix series about this accident. Both show very slow and strenuous attempts to open a valve manually. Why there was no use of level ...
Paul Jurczak's user avatar
0 votes
1 answer
218 views

Displacement and force control with pneumatic cylinder

Good day, I was confronted with the task to develop a new controller for pneumatic cylinders. The control channels are displacement and force. A load cell is used to measure the force (analog signal). ...
Paul's user avatar
  • 1
0 votes
0 answers
39 views

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?
K0ICHI's user avatar
  • 101
0 votes
2 answers
90 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 ...
user avatar
0 votes
1 answer
43 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 ...
Tim's user avatar
  • 225
0 votes
0 answers
41 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 ...
ehbowen's user avatar
  • 223
0 votes
1 answer
39 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 ...
mart's user avatar
  • 4,791
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 ...
lalebarde's user avatar
  • 101
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 ...
user2934303's user avatar
0 votes
0 answers
40 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 (...
Anshuman Sinha's user avatar
0 votes
1 answer
117 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 ...
Divyam Gupta's user avatar
0 votes
0 answers
123 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. ...
GeraltBlack's user avatar
0 votes
0 answers
36 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 ...
cheesus's user avatar
  • 101
0 votes
0 answers
29 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 ...
oorst's user avatar
  • 129
0 votes
0 answers
48 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 ...
Albert Choi's user avatar
0 votes
0 answers
268 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 ...
Forivin's user avatar
  • 109
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 ...
Abed Paulus 's user avatar
0 votes
1 answer
124 views

Automated valve for testing module

I work frequently with materials sensitive to oxygen and moisture, within a glove box. However, there are frequently times I want to move these samples from the glove box to a scanning electron ...
User2341's user avatar
  • 313
-1 votes
1 answer
242 views

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 ...
Prerna 's user avatar