Valve Definition and 235 Threads

I am looking to open a series of valves in a chamber under 10" of lift(water) ~.36psi which are normally held closed by a very light spring and the constant air pressure. The valves are very light weight and range in surface size from approx 2 to 6 sq inches, or approx .72 to 2.16 lb of initial...

Hi, Smoluchowski's trap door was proven to fail to obtaining work in a system without heat difference. The problem turns is random movement of trap door due to random particle movements. However I could not find any discussions of such system where the "trap door" did not involve moving parts...

When i read the manual, it said if the valve face is too wide and narrow, it need to cut the valve seat to meet the specification. I guess if the valve face too narrow, then the valve performance is not the best. but i don't understand if the face too wide, what is the problem.

Hello, I do not really know if this is the right place to post this message ... if it's not then I'm sorry I am looking for a valve that allows the flow of liquid but prevent air escaping out form let's say a sealed container ... Is there such a thing?

I am attempting to design a component to remotely control the throttle on a mini petrol powered ATV as a little project. Initially I have had the idea to adapt a standard cruise control unit to do the job but was wondering if anyone had any other suitable ideas? (Obviously this will not go out...

Folks, I have an application that will require an air inlet port to occasionally be exposed to water (splashing mostly), a simple splash guard will likely not work. Are there any off-the-shelf or simple solutions that anyone can think of that can be used for keeping the water from entering...

Hi all, I'm new to this forum, but have used it before for school. I'm currently working on my MS mechanical thesis which pertains to vortex rings in fluid. I was wondering if anyone had any good websites/suggestions for an electronically controlled valve with the following specifications...

I need to compute for the relief capacity (gpm or lb/hr) of a 10" rupture disc with relief valve set at 180psig. Vented out into the atmosphere. Assume fluid is water at 140F. I tried using ASME and API Equation but they give different answers. Can someone tell me the correct answer and what...

Hi, I'm looking for a standard (CGA, ANSI, ISI, etc.) which lays out requirements for the marking of pressure ratings on shut off valves (which aren't cylinder valves) in the USA. Does anyone know what it is or if it even exists? Any insights are much appreciated. Thanks! Blake J

Hi . I am modeling a sodium steam generator in Octave. I build a set of differential equations and solve them with Octave DAE solver. My model works just fine. Now i would like to start implementing controls but I am quite confused with P conroler output signal and with what it actually...

Hello guys, I want to study the temperature evolution of a gas in a vessel from 200 bar to 20 bar. I made the assumption the expansion is isentropic. However I have some trouble to represent the heat exchange between the wall and the gas. I used the energy conservation (transfer from a...

Hello, Im a student and I try to design a valve connected to a tank. However I have some troubles to define the phenomena. I have a pressurized tank with air at 100 bar and I would like to know the evolution of the flow rate through the opened valve. The valve outlet is at the atmospheric...

I am investigating the cause for malfunction of a solenoid water inlet valve (when de-energized, the valve fails to close and instead exhibits cyclic surging of water flow). 4 of the 6 bleed holes are blocked with debris, and I have concluded that this is what caused the valve to malfunction...

My boss has a boat load of extra PVC piping laying around the shop and I wanted to use it to make a pipe organ. I need a way to electronically open and close the connections from each individual pipe to the main air supply. I'm on a tight budget and I'll need to make 88 valves in total. I have...

Hello, How can one calculate the dimensions of valve shims in Gas pressure shock absorber? Desription- The valve shims are orifices to the fluid flow in the hydraulic damping system. The dimensions play a very vital role in the adjustment of compression and rebound of the damper. I have...

I would like to know whether it is ok to use 220V Solenoid Valve in a 230V Environment. This is the Valve I am taking about. This is the Circuit I am going to make with this. http://www.electroschematics.com/6161/power-switch-with-infrared-proximity-sensor/ Thanks in Advance :)

Homework Statement An automatic valve consists of a 225 X 225 mm square plate that is pivoted about a horizontal axis through A located at a distance h = 90 mm above the lower edge. Determine the depth (d) of the water for which the valve will open." Given: h = 90 mm, y = 225 mm *Answer...

Hi everyone, In a current project, I'm curious about the risk of silicone tube cold welding when used with a solenoid pinch valve, such as = http://cfnewsads.thomasnet.com/images/large/454/454667.jpg What is the likelihood silicone tube will cold weld at the pinch point, if the pressure is...

I am planning to custom build a water tank into which a household washer should discharge it's used water. I have estimated that a tank holding 60 ltrs would be sufficient. This quantity should be released into the building's drainage system within about an hour because the system is old and has...

Briefly, a solenoid valve utilizes a solenoid to move a soft iron core in such a way as to open/close an orifice to allow/inhibit flow of a fluid. I am a bit rusty on my E&M and I have a couple questions about this operation. 1) When a magnetic field is created using the solenoid, the soft...

Briefly, a solenoid valve utilizes a solenoid to move a soft iron core in such a way as to open/close an orifice to allow/inhibit flow of a fluid. I am a bit rusty on my E&M and I have a couple questions about this operation. 1) When a magnetic field is created using the solenoid, the soft...

I am having issues with solids building up in the 10” discharge ball valves on Mother Liquor Pumps that prevent operations from being able to close the valve. I have had a few discussions regarding ways to improve or eliminate this issue which have included insuring the valve is insulated/traced...

Hello, I am trying to build a high-speed X/Y cartesian robot which vacuums up defected parts from a moving conveyor. The end effector of the robot has a venturi vacuum integrated. Because the vacuum is constant, I need a Z-axis to go up/down for the end effector to get the defects otherwise...

Why is it that sometimes the 2 way valve is smaller than the size of the pipe ?

hi guys...can anyone tell me that whether v use only globe valve in steamline connections in common practice?

Is there a specific location (say top, bottom etc.) that a safety relieving valve is put on a pressure vessel? Say there's a tall refining separation column (operating above atmospheric pressure), where would logic (or codes) indicate that a pressure relief valve ought to be ideally placed...

Homework Statement A thick walled insulating chamber contains ##n_1## moles of helium gas at a high pressure ##P_1## and temperature ##T_1##. It is allowed to leak out slowly to the atmosphere at a pressure ##P_o## through a small valve. Show that the final temperature of the ##n_2## moles...

How exactly would you describe the principle of a valve for flow control? In a globe valve for example the fluid flows through valve seat and generally leaves the valve with the outlet diameter being the same as the inlet diameter. My original assumptions were that Bernoulli's principle...

I just watched a video by Koenigsegg engineers and came across this question. Why is camshaft the primary control of the engine valves? Using electronic controlled actuators would certainly benefit the engine in aspect of performance, but might increase the cost of production as well. People...

I have 2 questions on a two-port valve that I would like to ask for assistance with. There are three pairs of drawings below that need explanations: The first pair shows a one-piece armature with two o-rings providing sealing service on the bottoms of the upper and lower plates. The o-rings...

In vapor compression refrigeration, I know how to calculate the work done by the compressor (enthalpy at outlet - enthalpy at inlet), but I am lost on how to calculate the work done by the evaporator, condenser, and the expansion valve. For the evaporator and condenser, if I wish to have a...

Hi, I was wanting to insert 1 inch foam balls inside a container of ferrofluid, causing the foam ball to float. A normal one-way water valve would not let the ball through without any leakage (I believe), therefore I think that If i can build a valvue that consists of a ring of neodynium...

Hello, I'm Nate, and I'm looking to build a compressed-air engine. I'm using a pneumatic cylinder with a 3" bore and a 12" stroke. That was simple enough to find. What hasn't been simple to find is a manual valve large enough to actuate it. I've found small 5-way valves on ebay and amazon, but...

I have been looking at the basic operation of a heat pump. On these pumps there is an expansion valve. This valve is a narrow hole where the condensed working fluid is passing through, then evaporation happens in the low pressure side - after this hole. I assume this valve act as a resistance...

Hey! Yesterday I was on the Czech Physics Olympiad. There were many examples. To one, however, I did not invent anything, because I don't learn Hydrodynamics to much. I want to understand it better, so I want to ask you how you calculate it, please. I'm sorry, I did not give my progress here...

I want to know exactly why 16V engines produce more HP? Please explain in detail. What is the exact reason? Why usually 8 Valve engines produce more torque lower down the rev range?

Can somebody explain to me why the temperature gets colder when expanding through a turbine versus expanding through a valve. Please explain with equations.

I have to run a FEA analysis on a nozzle check valve body DN700... Its been to a professional engineer and he has completed the study so I am trying to do it myself to get to know the software better... I'm using PTC CREO 2 mechanica as the software... Attached find a picture of the valve...

I am trying to come up with a shape or design of a simple piston with holes that will allow fluid to flow in one direction better than the other. Very Simple shock design. I have tried tapered holes so as to speed up flow in one direction and it worked slightly but haven't quite found the...

Hi, I would like to experimentally determine the flow loss coefficient (or similar performance measure if another is suggested) over the various positions of a 4 way rotary valve (for instance, fully open, 50% open etc). The final outcome would be a specification on the positional accuracy (or...

Homework Statement Provide one self drawn graphic. Topic: artificial heart valve designThe Attempt at a Solution I'm a second year biomedical engineering student and our professor wants us to provide one self drawn graphic for a paper that is due on thursday We take classes in autodesk...

Hey guys I'm designing an air cannon robot and I need your help determining what valves and hoses i need to get in terms of maximum pressure. Based on my research, the maximum pressure ratings for hoses and solenoid valves are for constant pressure and even flows, but because I'll be making an...

Hi folks. I had a strange thing happen to me and I was wondering if some of you physics gurus could explain it to me. It's my understanding that gas escaping from a pressurized tank makes things cooler. In fact I recently had to empty my scuba tanks for transport and the valves did indeed ice up...

I was looking at 2 inch actuated valves. In the Indian market they cost around 12,000 rupees(~$220). I have a couple of car window control motors. I was thinking of building a valve with it. I would appreciate your thoughts on some simple design.

Hello, I am using a 3 way NC, manifold mount bullet valve from mac. I am finding that with my current setup, the valve leaks vacuum in ports 2 and 3 (I was told this is intentional). For my application, I would like to use two 3-way valves to control vacuum from a reservoir to a suction cup...

Hi there. I've been scouring google for a valve that will release a fluid (preferably a liquid) once 5psi has been reached. It must be within 100 x 40 x 40mm (the smaller the better). Has anyone any idea where to find a product like this? Many thanks. Andy

Hey, Just something i wanted to confirm, in a pipe system a booster pump is used to boost the water pressure. A accumaltor is postioned after the pump, a non return valve is required at the pump outlet. I believe the non return valve should be before the accumaltor but after the pump. Is...

I have a hand pump that I use to pump air out of things with and the plastic valves that I use keep failing eventually. Either from being under too much pressure, or from being under pressure for too long. I guess there's like a diaphragm in the valve that weakens and begins to leak. Here's an...

Hi everyone, I have to determine the size of safety valve for an air pressure vessel. I found in ASME and BS 5500 a procedure to calculate the size of safety valve, which relates the mass flow capacity to the: pressure, temprature, discharge area, s.v coefficient, and air parameters. This can...

Hello, I have abnormal situation on a site, there are installed 3 valves in parallel (cascade) in Fuel gas skid, upstream pressure of the valve is 30 bar, downstream pressure 25-26 bar, when 2 GTG starts up to load 40 MWt (100 %) the downstream pressure of the control valves decreses to 21 bar...