Butterfly vs globe and/or ball valves?
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I am an engineer providing mechanical planning for various industrial/manufacturing plants in the Kansas City area.  The practice of controlling temperature through valve adjustment is called throttling.  While throttling can be achieved using a butterfly valve, a globe valve is the standard application.  A ball valve should not be used for throttling.
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I would go by weight personally.  Timing it requires you to have consistent pressure which is hard to do especially if you have a high volume day.  This works best if you supply the containers to eliminate complexity of zeroing a scale, or the error of having differently weighted containers.  You'll need a platform that sends a varying electrical signal based on load, you could rig a potentiometer to change resistance based on the position of the platform, as the springs compress and the platform sinks the resistance decreases, now run a voltage through this potentiometer and a couple of resistors to get a variable voltage then run this into an op amp that turns on and off a relay that controls a servo that opens and closes a valve.  Adjust the resistances until you get it switching off when you want it to. I suggest ball parking it based on the weight of a gallon of water+container, then adjusting it up since there will be a small amount of momentum from the water falling from the faucet.  Setting up the Op Amp circuit isn't too tough I suggest getting a text book on them.  I suggest http://www.amazon.com/gp/product/0130149918/ref=pd_sxp_grid_i_2_2/002-1800445-2936816?%5Fencoding=UTF8\nIt's accessible to someone with little background in electronics, and is loaded with example circuits that you can virtually copy out of the book for any application.  It is also very robust considering it's simplicity.\n\nAs far as making it coin operated, use a locking mechanism that uses coins as it's key, then have that activate the power supply running to the op amp circuitry, and valve control, add another op amp circuit that turns off the power after the valve is closed.\n\nIf you're dead set on a timer, use the coin locking mechanism, but have it turn a dial timer, when the timer goes off it sends an electrical signal to an op amp that activates a relay and turns off the valve.
244022
Because it only takes a 90 degree turn to turn a ball valve off/on. Its faster!
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Most of the instrumentation companies have a product line of valve.\nTherefore you could check their respective websites. Some useful names are : Emerson, Foxboro, Invensys, Omega.com, Siemens, Yokogawa, ABB.com etc.
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The Teimgeist ball is 99% sphere(more than the previous ones).\nIt will help in greater precision and accuracy.It also has the minimum number of stitches
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The biggest benefit of the Butterfly blade is it's control, which many rate as one of the best on the market.  Really though, the best way to find the best paddle is to try them all out and decide for yourself.  I've included a couple links with forums and stuff which talk about different blades/handles and the like.\n\nMatt
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Just try a few searches with words including "valve", for example\nhttp://www.google.fr/search?hl=fr&q=valve+manufacturers&btnG=Recherche+Google&meta=\n\nTakes you to links like:http://www.valvesourcebook.com/\nor:http://www.thomasnet.com/products/valves-90052002-1.html\n etc etc etc
549180
possibly, try terrafly.com
380471
pneumatic operated butterfly valves with 3-15 psi control using a 4-20ma I to P converter based on a voice coil type machanics, don't try one of the 4-20 ma electronic I to P converters, Radio frequency, Variable frequency drives, Changes in grounding, make the electronic I to P converters less accurate and reliable. Add a 4-20 loop to the position control and your world will be perfect.
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The neat thing about geometric optimization is that the optimum shapes are always a perfect square, circle, triangle, sphere, etc. depending on what shape you are working with. In this case, a perfect half sphere with a 8m radius would hold the most water for the given surface area.
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Ionic Breeze. \nThe other ones you have to change the filter often which gets expensive. I would defenitly just go straight for the Ionic Breeze.
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Smooth surfaces\nLubricants\nRoller and Bowler baring
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What you need is a Wacom tablet. There is an entry level model (the graphire), the professional model (the intuos), and the ultra high end cintique (which has a build in screen). The main difference between the graphire and intuous is the pressure sensitivity. 512 vs. 1024 levels. Each model comes in different sizes. You can probably do just fine with a Graphire which starts at 99$.
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DVS hands down. They have better grip. But i would seriously recomend Emerica or Adio.
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Your subject is somewhat vague, but I believe the web site below can help.\nEnter Valve into their search window. Several device manufacturers are mentioned.\nHope this helps.
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There are many differences between indoor and outdoor balls.  Mostly, it is the material used and how it reacts to the elements.\n\nUsing a leather indoor volleyball outside will cause it to become waterlogged - even on a dry day - due to the surroundings and the moisture (humidity) in the air.\n\nThe stitching/seams is a big difference as well - outdoor balls have stitched seams (the good ones), while the indoor balls are sealed seams.\n\nThe weight is also different.  Using an indoor ball outside on a day with just a little breeze will cause chaos - it will blow everywhere.  The outdoor balls are weighted slightly to allow for some breeze (though you can use the wind for your serve effectiveness).  \n\nUsing an outdoor ball indoors isn't really that huge a deal, but the play will be different.  Best bet is to use an indoor ball indoors.  You will get much better indoor play, and you will look like you know what's up.\n\nI own both, and I am glad of it.  Best outdoor ball is the Wilson AVP silver or gold series (very soft leather, and they are WONDERFUL in durability).  Best indoor ball (I think) is Tachikara is the way to go.  Mikasa has a good ball for indoors, too.  Go to a reputable sporting goods store and they can explain everything too you, and get you the best ball for the money (most expensive is not always the best).
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I don't know but the only difference is that they have a better grip for when you insert it and that it's stronger (like SUPER tampons but not as big).\n\nhttp://www.playtexsport.com/