Butterfly Valve DN200 Wafer Type BS Standard

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1. Manual Wafer Butterfly Valve Description:
A butterfly valve is a valve which can be used for isolating or regulating flow. The closing mechanism takes the form of a disk. Operation is similar to that of a ball valve, which allows for quick shut off. Butterfly valves are generally favored because they are lower in cost to other valve designs as well as being lighter in weight, meaning less support is required. The disc is positioned in the center of the pipe, passing through the disc is a rod connected to an actuator on the outside of the valve.

2.Main Features of the Manual Wafer Butterfly Valve
1.Square and short neck. Easy to stick scutcheon and cost saving.Nominal bore mm 20 25 32 40 50 65 80 100 125 150 200
2. The material of valve body: cast iron, cast steel, cast stainless steel and so on.
3. Pressure grade: 1.6Mpa, 4.0Mpa, 6.4Mpa
4. Connecting type: flange coupling
5. Temperature range: normal temperature -20---230ºC  the thermal slug type -60---450ºC
6. Operation form: automatic open or close
7. Flow characteristic: equal percentage, linearity
8. Leakage: single-base valve: 0.01* rating Kv
9. double-base valve, sleeve valve: 0.5%* rating Kv

10.Cast hole. Flange connection meet ANSI 125/150#   DIN PN10/16   BS4504 PN10/16 in the meanwhile.
11.Soft seat. Replaceable. Increase of service life.
12.Double half shaft without pin.
3. Manual Wafer Butterfly Valve Images:
 Butterfly Valve DN200 Wafer Type  BS Standard


Butterfly Valve DN200 Wafer Type  BS Standard

4.Manual Wafer Butterfly Valve  Specification: 
Butterfly Valve DN200 Wafer Type  BS Standard

 1. What is manual wafer butterfly valve?
A: Wafer style is the more common of the two and is less expensive than the lug style. The wafer style butterfly valve is just about the standard. It ís so common that no one even bothers to use the word "wafer" when ordering a butterfly valve. It is taken for granted that if a butterfly valve is ordered, a wafer style will be received.
2. How about the Installation of the Wafer Style Butterfly Valve?
A: Butterfly valves are installed by inserting the valve between two flanges using bolts or studs and nuts to hold it all together. This type of installation, of course, makes it impossible to disconnect just one side of the piping system from the valve. That benefit is received using the lug style valve.
3. What is the working principle of manual wafer butterfly valve?
 A: A butterfly valve is from a family of valves called quarter-turn valves. In operation, the valve is fully open or closed when the disc is rotated a quarter turn. The "butterfly" is a metal disc mounted on a rod. When the valve is closed, the disc is turned so that it completely blocks off the passageway. When the valve is fully open, the disc is rotated a quarter turn so that it allows an almost unrestricted passage of the fluid. The valve may also be opened incrementally to throttle flow.


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Q:Help! Sticky Trumpet Valve?
I would wager there is no dent, but the valves aren't quite straight. They have to be straight. Don't know what it will cost to fix, they may have to be replaced.
Q:1993 pontiac bonneville bad egr valve question ?
could be egr or fuel pressure regulator. while running pull vacuum line off of regulator if fuel is present its bad .
Q:how to reset control valve with electron pneumatic positioner of (make) Instrument and system.?
Control valves come with a spring g which keeps the valve in either the open or closed position, when there is no air pressure applied to the diaphragm of the valve actuator. For this reason, I'm unsure what you mean with 'reset the valve. The electro/pneumatic positioner is a device which applies the air pressure required to open (or close) the valve to the position the electric signal from the controller is calling for, rather than using an I/P transducer to output a 3 to 15 PSIG air pressure to the diaphragm. Sometimes an actuator requires more pressure than the normal 3 to 15 psig to move a sticky valve to the correct position. Edit your question to detail what is occurring, and I or someone else can give you a proper answer. TexMav
Q:Can you put a blow off valve/dump valve on a diesel e46 BMW 320d?
Most diesels do not have throttle valves (including yours), therefore a blow off valve would never work. They work by relieving the pressure build up caused when the throttle valve is closed (foot lifted off gas pedal in a petrol engine), which happens when you shift (usually only for manuals) so the built up pressure does not bring the turbo speed down. A side effect of this pressure being dumped is the whoosh sound, which some people desire more than the performance gains it offers. That sound is the air rushing out of the intake system, which usually has been metered already, and now is wasted. The ECU measures that air and adds fuel for it. When it gets blown to atmosphere, the fuel is added, but not the air. Now the engine is running rich. There are some systems that recirc that air back to the turbo, but then there is no whoosh sound. Anyway, since most diesels do not even have a throttle valve, it won't do any good.
Q:I need help with my trumpet/cornet valves?
Every trumpet I've used has numbers on the valves. These should be facing you when inserting the valves, valve 1 being closest to you, and valve 3 being closest to the bell.
Q:Articifical Heart Valves -?
There are three of these things: the caged-ball which utilizes a metal cage to house a metal ball, tilting-disc valves, which have a single circular occluder controlled by a metal strut. They are made of a metal ring covered by a tissue, into which the suture threads are stitched, in order to keep the valve in place once implanted and there's bileaflet valves, which consist of two semicircular leaflets that rotate about struts attached to the valve housing which is the most recent type, eh? So heart valves are considered to be extremely durable. They're made of either pyrolytic carbon or titanium coated with pyrolytic carbon, and the sewing ring cuff is Teflon or polyester or dracon (probably dacron :P). They key to the materials chosen is durability because of the constant fluid flow. I see this as pure engineering, not medicine, specifically fluid mechanics: like if there are rare complications for example thrombus formation is a debilitating side effect of high shear stresses created by design of the valves. Ideal heart valve from an engineering view would produce minimal pressure drops of course have small regurgitation volumes because it's supposed to minimize turbulence and regulate the flow.
Q:What is a pcv valve? Car mechanics?
PCV valves don't really affect the way a car runs. Unless you leave the hose to it open, creating a massive vacuum leak. They're to keep acidic gases from building up in your crankcase. Without it, you would need to change your oil a lot more often. Before about 1965 or so, cars had what's called a road draft tube, which through a venturi effect, drew out these vapors. Some sort of crankcase ventilation has been used pretty much as long as there have been cars. Many newer vehicles don't actually use a valve, but a calibrated orifice instead.
Q:Riding with a Schrader/Presta valve adapter?
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:Aortic valve replacement surgery?
This is a routine, well established procedure. The incidence of major complications are less than 4%. There are two kinds of artificial Heart Valves. One is mechanical, and the other is tissue valve. The mechanical valve requires the person to be on life long anti-coagulation therapy. This also requires periodic check on the persons pro thrombin time. Based on this, the anti-coaglation dose will be adjusted. The problem with anti-coagulation is that it may lead to bleeding complications. The tissue valve is made from the tissues of a bovine or porcine heart. The tissue is denatured to ensure that the valve is not rejected as a foreign tissue. (This is not a problem with mechanical valves.) Being made of tissue, these valves do not allow clots to form, which means that anti-coagulation after a short initial period is not required. This is a major advantage, especially for women, who may have some earlier bleeding problems. Then why are mechanical valves used at all? Being made from non-living denatured tissue, tissue valves cannot repair themselves. They also tend to get calcified in younger people with more calcium activity. They also have a shorter life than mechanical valves. Surgeons tend to favour mechanical valves for younger people (whose life expectancy is higher), and the tissue valve for the older, as such people may already have some bleeding problems, the valve's durability is not critical and the patient has lower calcium activity. These are general considerations. Only a surgeon armed with the full test results, and a knowledge of the patient history, who can advise the patient on what is the best option in each case. To reiterate, AVR (Aortic Valve Replacement, not my initials) is a routine procedure and recovery tends to be uneventful. Wish you all the best, and as uneventful a recovery as possible.
Q:Can I free up a stuck toilet shut off valve?
turn off water to house, if your valve has a nut behind handle that has threads on inside of nut ie brasscraft style, you can go to store and buy new valve and replace stem. If pipe comes out of wall (angle stop) get that one, if comes out of floor (straight stop) get that one. remove new stem and old stem and switch. If nut behind handle has threads on outside of nut, then you must replace valve. ( you have to remove nut to see where threads are ( i don't but you might) depending on what type of pipe you have is what new valve you will need and also how close to wall or floor is how to attack problem tre..706yahoo 4 any more help

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