Valve Definition and 235 Threads

Homework Statement You have your bicycle upside-down for repairs. The front wheel is free to rotate and is perfectly balanced except for the 16 g valve stem. If the valve stem is 34 cm from the rotation axis and is located 32 degrees below the horizontal, what is the resulting torque about the...

I would like to use the vacuum from an engine to actuate a vacuum canister. However an engine can experience pressures of 10-20 kPa on engine deceleration, up to 101 kPa at WOT. I need to create a pneumatic circuit that will meet these criteria: 1. At 60 kPa and below the vacuum of the...

I need to determine if a valve can handle a flow rate of 50 GPM, this valve being: 2/2 Way, Normally closed, w/ 2-pilot control, and coupled solenoid. I also need to determine pressure drop... it is a burkhert model - 457361D the valve specs indicate: Cv = 35.1 pressure...

I'm in the process of designing a pneumatic air valve, and although I'm pretty sure I've got the concept down, I thought I'd run it by you to double check. Before I start explaining, here's a drawing that should give you a general idea of what I'm trying to accomplish. There are a few...

:!) anybody knows @ design of thermostatic expansion valve used in refrigeration and air conditioning.....?

A water based heating system is to be regulated by 2-way valves. How do these work exactly? Do they simply constrict the flow? Isn't it so that if a pipe is constricted, the velocity simply increases to maintain the flow? I mean, flow in must equal flow out.

the de laval valve comprehensively reduces the pressure, temperature and increases velocity of passing gases. but it is mostly employed in areas where gases are at very high speed. could it give same results for speeds as low as, say, 50km/hr?

I have been thinking about this a lot. It is about conservation of energy. A simplified analysis using Bernoulli's Principle for one-dimensional incompressible liquid fluids should be good enough to gain some understanding (at least for me). Let us also neglect gravitational effects. Assume...

Dear all, I'm a new user to Maxwell and to FEM. I am trying to do a magnetostatic analysis for a solenoid valve for finding inductance and force on the armature. I am facing few problems while making the simulation. 1. what value shall I assign for the source? (In the tutorial provided by...

Hey I was just wanting to know, for something like a guitar amplifyer what is the inputted signal connected to on the valve (cathode, anode, filament or grid) and also what the outputed signal is connected to. thanx

I'm in need of some assistance in calculating some flow vs pressure specifications, in order to make some changes to the system. I have a PRV valve that has a preset setting of: PRV NO.1 & 2 SET PRESSURE = 1034 KPA (150 PSI) @ 0.63 L/S (10 USGPM) Meanwhile the design criteria states the...

I'm trying to understand how a pressure reducing valve works. I'm puzzled: Water enters one side of the valve. Whatever opening the valve gives for the water to flow through, won't it come out with higher pressure? If the static pressure is less on the outlet side, doesn't that indicate that...

Homework Statement A large population of nominally identical "fail to close" control valves are put into service on the same day on similar installations. The number of valve failures per month N was recorded over time and shown to be given approximately by the following equation Calculate...

Homework Statement I am trying to find the probability that a valve will be able to undergo one cycle of demand? Given that a particular type of remotely controlled mechanical valve can be assumed to have a probability of not opening, when closed, of 0.02 and a probability of not closing...

Hi all. I am now looking for a valve whose opening can be quite accurately controlled. The size of the opening shall be quite small, around 3mm - 1cm? I am wondering if you know any valve that may suit my usage? Can the opening of a solenoid valve be adjusted using electric signal?

Hi all. I am doing a design of controlling a fluid flow. We have some fluid which is subjected to some weight, which will serve as the external force to drive the flow. The objective is to maintain a constant flow rate. Do you guys think I shall constantly changing the opening of a valve to...

Here is some information I have for throttle bodys: 60 millimeters is equal to 2.362205 inches = 17.52 square inches 65 millimeters is equal to 2.559055 inches = 20.56 square inches - (17%) 70 millimeters is equal to 2.755906 inches = 23.85 square inches - (36%) 75 millimeters is equal to...

Hi guys, i am doing some calculations on the valve spring of a 4 stroke, 4 cylinder motor vehicle engine. To my understanding, valve bounce will occur once the valve spring is operated at a speed over their natural frequency (which i calculated to be 5500 rev/min). If i were to push the...

Hi guys, i am doing some calculations on the valve spring of a 4 stroke, 4 cylinder motor vehicle engine. To my understanding, valve bounce will occur once the valve spring is operated at a speed over their natural frequency (which i calculated to be 5500 rev/min). If i were to push the...

Hi! I am working with ball valves and I need to calculate the cv for several sizes. I only knows the pressure drop expressed in terms of the "equivalent feet". Unfortunally, I do not have a lab to measure. thanks a lot!

what's the difference between AC and DC power source for solenoid valve?and what is mainly the power consumed for? for mature products available, what should be taken into consideration for power design? thanks

I am wondering if anyone has a source for the specs on beverage container valves? I am looking for replacement o-rings and I don't have the valves in front of me, so if someone has a source for the specs, that would be great. Thanks!

Please help me in this problem... How to design a valve for gas stream? To be more spicific let's assume that we have aflow rate of 40000 cm3/h of CH4 ?

Consider an apparatus where there are two rigid glass bulbs separated from one another by a valve that is closed initially. Bulb #1 has a pressure of 1.3 atm and a volume of 4.27 L and bulb #2 has a pressure of 6.6 atm and a volume of 7.40L. What is the final pressure (in atm) in the apparatus...

A DOHC engine has the valves controlled by two servo motors, an engine speed encoder controls the valves possitions via electronics, this is an obviuos solution to four stroke ice valve control, what are the reasons why it is not used?

Hi, I'm a newbie :frown: Now,I'm studying about general engineering! And I had difficulty finding materials of EXHAUST VALVE. Everyone,can you help me? Where and how I can get them?

The auto industry will be using this method to contol inlet and exhuast valves, i think 6000 rpm is the limit so far with a 48v (coil), this system has many advantages ie variable valve timing/ dwell, what are the limitations of this idea and could it be retro fitted to cam shaft engines?

I was wondering anyone could help me figure out the type of valve I need. The application is I have two sources of water going into the same reservoir and I want to be able to switch between the two. I am currently looking at Direct-Acting Solenoid Valves 3 way Now I am noticing some...

Hi I’m writing my bachelor thesis about valves, and was wondering if anyone could help me with the following derivation: I need to show the algebraic link between the mechanical energy-equation and the ”valve equation” that is Cv=Q * [Square](Sg/[Delta]p). This can also be called the flow...

Why isn't Ferrari Variable valve timing - they have a 3d cam with variable profile along its length and shift the camshaft to provide variable valve timing, why isn't it popular? Is it because of the cost?

I'm currently part of the propulsions team for a hybrid rocket project here on campus, working on the liquid fuel injector system. Specifically I'm trying to model which injector designs give us the best burn rate over the entire burn. However, I'm a physics major, not an engineering major, so...

Hello May you tell me what is the best theoretical shape around a valve guide for best flowing in an combustion engine ? best regards Philippe

I'd like to put a valve (like the ones on tire tubes) that will connect to a bicycle pump onto a PVC tube (on the side, or at the end). Anyone know how I can do this? What fittings will I need? Thanks.

I am looking for a method of actuating a valve on a musical instrument. This particular valve needs to rotate 90 degrees, but on some instruments, 120 degrees. I will like to actuate via wire control i.e. with a embedded computer. For example, close a switch, the valve rotates 90 degrees and...

a lever is resting on a valve. the valve is located 3 in from the end of the lever. the total length of the lever is 9.5 in. a 4 lb force is present at the opposite end of the lever. the force makes a 28 deg angle with the lever. the lever makes a 20 deg angle with the horizontal. I am supposed...