Q:If I buy one of those Presta valve adapters can I just screw it on and leave it on while I ride? Will I lose air pressure at to fast of a rate?

Yes, just leave it on the valve while you ride. I tuck mine in my seat pack, but there's no reason you can't put it on the valve. The presta valve should be screwed shut like normal, then just put the adapter on over it. One of the best little gadgets to have if you ride in the country. Lots of people have portable or shop air compressors, but only *real* cyclists will have a pump or air chuck to fit a presta valve. If you inflate your tube with CO2, be sure to let it thaw out before you unscrew the adapter to close the presta valve. It's easy to lose air or tear the rubber at the base of the valve if you don't. I rode with a guy that used to just tuck his adapter and a patch kit in the leg of his shorts because he wanted to travel ultralight. I guess you could do that, too, but I'd worry about driving them into your flesh if you happen to crash and land on them.

Q:I want to install a hks blow off valve on my car but is it true that i need a turbo installed first in my car or not.and are they legal in the state of californiapermitted,i want my car to make that air release sound when i shift gears,but it needs a turbo installed or can i still get what i want from a blow off valve without a turbo!!!!!

I'm not sure which you obsess on more, that girl, or the blow off valve. But since you keep asking, apparently wanting someone to say you can, I will answer that you can, but you will need a small compressor to build up pressure you can release. Happy now?

Q:Is there any application usuage of ball valve in comparison,most engineers opinion is as Valve size get reduces in reduced port.Other than this what paramteres decides in selection of either of one

W.W. Grainger out of Chicago ships all over the world, also McMaster-Carr Supply.

Q:What would be the effect on valve opening if the clearance was set too large or too small, please help

Too Much Valve Clearance

Q:I was looking at the specs on my audi a4 and it said 30 valves and I was looking at a few other cars and they said 24 valves. What do the valves determine? Whats the difference if the car has more valves than another?

Audi now uses 5 valves per cylinder. Why? They obviously believe it offers advantages over conventional 12 or 24 valve systems (for 6 cylinders) but it's not clear what benefits it has to Audi buyers. Is is just more complex and more likely to have problems? Who knows?

Q:I believe my EGR valve is bad. I am having symptoms of a bad one. If I unplugged it and took my car for a drive would the symptoms improve, if in fact it is a bad EGR valve?

there are testing procedures that can be found in any car repair manual. the simplest are the vacuum operated ones. the electrically operated ones are a little more difficult to test, but can be done

Q:I see a valve that says FNW on it with ( on, off ) but I'm not sure it's the main valve to the water supply. It does go to the water heater so I'm guessing that it's it. Does anyone know anything about the main water supply valve and how to find it?

Find the meter, the shut off valve will be within a foot of the meter, If the meter is digital and on the outside of the house, look for a closet, or cupboard near the meter on the inside of the house, the meter will be concealed there.. The valve you are looking at is a shut off valve for the heater.

Q:I have a 3-circuit sprinkler system in my yard (built by me, last year). I discovered this week that I overtightened the connection between the valves and the downstream pipes, and 2 of the three valves are cracked, and leaking, at the connection. I replaced all 3 valves, and now I need to reconnect them to the supply. But this means I'm working backward - when I bult the system last year, I worked downstream - I built the manifold first, connected the valves, then the remainder of each branch. Now, I have to make the new manifold fit the valves, and naturally, they don't line up perfectly. Any tips/tricks on connecting valves in this situation? Is there such a thing as flexible pipe that can withstand continuous pressure? I'm using unions at both ends of each valve to help things go together/come apart more easily.

valve manifolds are something that requires practice and experience. i used to struggle with them at work until i did a good bit of them. 3 zones is not that many valves so it shouldnt be too difficult. if they wont line up exactly right, i would recommend adding longer peices of pipe to the mainline side of the vavles and re routing the supply line futher back and you will have more room to flex the pipe and vavles into the Tees and 90s. do not use any form of flexible pipe on any mainline. you will regret it. lol the bigger the hole you dig will give you the most room and the more pipe, and room will give you more flexability to build the manifold. it is easier to connect the valves the way you did it first though, but you can do it either way. good luck and hope this helps

Q:I'm trying to estimate the amount of gas lost when a relief/blowoff valve is opened on a pipeline. If I know the valve opening size, pipe size, gas pressure, and the duration the valve is left open. Ex. A 12 inch pipe operating at 400 psi has a 4 inch relief valve that is open for 5 minutes. How much gas has been release? Assume constant flow of gas. Thanks in advance

Below is one of many sites with software for sizing relief valves. Each relief valve has a specific orifice size usually indicated by a letter such as A, B, C etc. With this and the other information on the gas being relieved you can calculate the rate the valve is relieving when it is open. Note: most of the time you will be in the critical flow range so once the valve is open the flow rate will be constant until the pressure falls and the valve reseats.

Q:Why are pig hearts valves used as replacements for damaged heart valves in humans? Are there any complications and are they still used today?

The tissue is most like ours. Yes, they are still used. They have a low rate of rejection.