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to maintain oil-water interface
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What is the difference between valve and control-valve?
Control valve: Used to modify flow rate in a process control system.It has characterization: linear,equal percentage and quick opening Pressure inlet must be higher than the output pressure Regulator:Diapghram operating valve which controls outlet pressure (reducing application),control inlet pressure (back pressure) or either (differential reducing and differential relief applications
What is the difference between the velocity operated and pressure operated microphones?
Know your microphones - what is the difference between pressure, pressure gradient, and velocity microphones?David Mellor | November 30, -0001Microphones work on the principle of pressure, pressure gradient, or velocity. If you don't know the difference, then you can't yet call yourself a sound engineer.This is something from the text books. Actually you don't have to know this to be a sound engineer - the proof of that is the 90% of sound engineers that don't know it! Yet a little theory never hurt anyone. And if you know how things work in theory, then you can apply them better in practice.There are two basic types of microphone - omnidirectional and figure-of-eight, which can be made in either dynamic or capacitor forms. Cardioid and hypercardioid microphones are hybrids, combining features of both the omni and figure-of-eight.The omnidirectional microphone works on the pressureprinciple. The diaphragm, which picks up sound vibrations in the air, is completely open at one side, but completely closed at the other.The sound vibration is either pushing the diaphragm against the fixed pressure of the air on the other side, or it is reducing the pressure on the front of the diaphragm allowing the pressure behind to push it out.One of the features of pressure in a gas is that it pushes equally in all directions. "Equally in all directions"? That makes the mic omnidirectional then.[For the sake of completeness, it should be mentioned that there is a tiny hole in the capsule to the rear of the diaphragm. This is so the microphone can compensate for long-term variations in air pressure. The hole is too small to affect its sound characteristics.]The figure-of-eight microphone on the other hand has both sides of the diaphragm fully open to the air. So it doesn't compare the incoming sound pressure with a fixed pressure on the other side of the diaphragm like the omnidirectional microphone. Instead it compares the pressure of the sound wave on one side with the pressure of that same sound wave after it has traveled through to the other side.Yes, it is a tiny difference in pressure, but strong enough to move the diaphragm.The difference in pressure between the front and the back of the diaphragm depends on the angle of incidence of the sound wave. In the extreme, if the sound arrives from the side of the diaphragm, then the pressure will be the same at the front and the rear, therefore the diaphragm will not move and there will be no output.Lastly, the velocity microphone... it doesn't exist! However you will see the term used frequently, particularly in relation to ribbon microphones.A velocity microphone, if it existed, would respond to the actual velocity of the air molecules striking the diaphragm.For this to happen though, the diaphragm would have to be so light that it could respond almost instantaneously, and so thin that there was no pressure difference between the two sides of the diaphragm. In practice, the diaphragm is too heavy to acquire the velocity of the air molecules and it has significant thickness.But a microphone that doesn't make it as a velocity mic, because its diaphragm is too heavy and thick, is still sensitive to pressure gradient. So in practice, these microphones are pressure gradient mics.So now you know it - the difference between pressure, pressure gradient and velocity microphones.
How computer output sound?
Electric current from the sound card is applied to an electromagnet changing magnetic field pushes a magnet back and forth,which is attached to the speaker cone.The moving speaker cone creates changes in the air pressure which your brain interprets as sound.
What kind of computer setup is needed to view online films?
Typically, a computer needs certain kind of software to play back files of movies or film clips online. Popular software includes the VLC Media player, which plays almost all files on a PC or Mac.
Back panel connector of a computer?
back pannel connector
What is the function of the gravity disc in alfa laval purifier?
-to maintain a back pressure in the purifier -to control water flow through water port outlet -to control discharge of oil flow rate
What is the purpose of having a back pressure valve in marine refrigeration system?
when two refrigerated spaces are severed by only one compresser & condenser but need to be maintained at different temps. a back pressure regulator comes into play. The back pressure regulator will be installed on the outlet of the refrigeration system to maintain a minimum back pressure in the evap coils. Since pressure is directly related to temp. then the temp. desired can be maintained by the pressure you set.
What is a pressure cut for a tree?
A pressure cut for a tree is when there is back pressure on certain limbs of the tree and a cut is attempted on it. A pressure cut should be planned carefully with limb locks as the whiplash may severely injure the logger.
What does the county do in the HTS?
Counties are responsible for the maintenance of certain roads, usually back roads out of the city limits. Each state or jurisdiction determines what roads are maintained by the county, city or state.
Where can I find an air purifier that comes with, at a minimum, a thirty day, risk free money back guarantee?
Several manufacturers make these offer.For example Surround Air does with it's portable Intelli-Pro Air Purifier
Why do dogs move there back leg really fast when you pet them in a certain spot?
Like some humans have 'Pressure Points' that certain area triggers the dogs muscle there, causing it to move quite fast.
What was the basic information about the Battle of Midway?
a message coded AF was intersepted by us code breakers and we trying to see were AF was. we sent a message that they would understand about midway needing a water purifier and they sent a message back about AF needing a water purifier so we knew when & were they were going.
Chevy Caprice classic governor chip?
There is no governor, there is a REV limiter that will cut back on fuel pressure whne a certain RPM is attained. It is preset in the Engine Control Module.
What is back pressure in a home ac unit?
Suction pressure
What is the difference between back pressure and absolute pressure in steam turbine?
Back pressure is the small amount of vacuum that is created when the used steam condenses from the turbine back into re-usable water.
What is back pressure?
Pressure going in the opposite direction in which it should be going.
Does a resonator produce back pressure?
depending on its design, a resonator will produce anywhere from almost no back pressure, to a mild amount.
