Ductile Iron wafer butterfly valves DN250
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- Loading Port:
- Tianjin
- Payment Terms:
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- Min Order Qty:
- 100 set
- Supply Capability:
- 80000 set/month
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A butterfly valve consists of body ,stem ,disc , actuator (manual actuator, worm-gear actuator , aerodynamic actuator or electric actuator) , and wafer type butterfly valve can implement the process for turning on turning off and regulating the flow by the circumrotation of stem and disc that is droved by actuators.
1.Simple and compact construction. Small in size and light in weight. Easy transportation, installation and maintenance.
2. Quick 90 degrees on-off operation. Minimized operating torque ,energy saving.
3. Excellent sealing performance with no leakage. Long service life.
4. Wide selection of materials ,applicable for various media..
5. Flow curve tending to straight line. Excellent regulation performance.
- Q: What's the difference between the three eccentric butterfly valve and the two eccentric butterfly valve?
- Single eccentric butterfly valve: extrusion problems, address concentric butterfly valve and valve seat of the resulting in a single eccentric butterfly valve, the structural characteristics of the stem axis deviated from the disc center, so that the butterfly is no longer a rotary bottom plate, axial dispersion, reduce the excessive squeezing and the lower end of the seat of the butterfly board. Double eccentric butterfly valve: in the single eccentric butterfly valve on the basis of further improvement of forming, is the most widely used double eccentric butterfly valve.
- Q: Why use special flanges for butterfly valves?
- Mainly for clip type butterfly valve sealing ring on the valve body than the ordinary flange chip small diameter. Therefore, the ordinary flange can not guarantee the effective sealing effect. Therefore, you must use a dedicated butterfly flange sheet
- Q: Model specification for butterfly valves
- 1. classification by structure(1) Central sealed butterfly valve (2) single eccentric sealed butterfly valve (3) double eccentric sealed butterfly valve (4) three eccentric sealed butterfly valve2. by secret cover material classification(1) soft sealing butterfly valve. (2) metal hard sealing butterfly valve.3. classified by seal type(1) forced sealing butterfly valve (2) pressure sealed butterfly valve. (3) automatic sealing butterfly valve. The pressure of the seal is automatically generated by the pressure of the medium.4. classification by work pressure(1) vacuum butterfly valve. Butterfly valve with lower working pressure than standard atmosphere. (2) low pressure butterfly valve. Butterfly valve with nominal pressure PN<1.6MPa. (3) medium pressure butterfly valve. Butterfly valve with nominal pressure PN 2.5--6.4MPa. (4) high pressure butterfly valve. Nominal pressure PN is 10. 0--80.0MPa butterfly valve. (5) ultra high pressure butterfly valve. Butterfly valve with nominal pressure PN>100MPa.5. classification by operating temperature(1) high temperature butterfly valve. T>450 degrees C butterfly valve (2) medium temperature butterfly valve. 120 C6. classification by connection1 pairs of clip butterfly valve2, flange butterfly valve (3) lug butterfly valve. (4) welded butterfly valve.
- Q: Have an iron block, aluminum heads, solid roller lifters, Jessel rocker shafts, what should my valve clearances be cold, and hot??
- Because you apparently have a built engine here rather than a factory assembly which simply has solid lifters, and the data you have is either inconclusive or conflicting then I will recommend the following procedure: Assemble them cold and adjust to Intake .010 and exhaust .020. After firing up the engine, adjust the carb, if it is so equipped, to a smooth rich idle and run it in for a couple of hours mixing idling with moderate load and a few full throttle pulls through 2nd gear to seat the rings. Bring it back into the shop good and hot and set the valve clearances at .008 intake and .016 exhaust hot. After adjusting the valves readjust the idle to 700 RPM and set the timing. initially set the timing at about 2 degrees BTDC until you hav run in the engine, If you are without clear specifications for timing use a vacuum gauge and play with it between 2 and 10 degrees BTDC with the vacuum advance disconnected and plugged, you are looking for the highest vacuum at idle as a starting point. Run it hard including lugging it in high gear at around 2500 to 3500 rpm at or near full throttle, if you are getting spark knock back it down 2 degrees at a time until it does not knock when lugged. If you get no spark knock when lugging it you might try advancing the timing 2 degrees above the vacuum indicated optimal setting but do not go beyond that point. After setting the valves and timing readjust the carburetor to the best lean idle and set to 650 to 700 rpm depending on where it feels comfortable. In the old days a lot of this was done totally by ear - hence the term engineers. Today I think most holders of that revered title do not have a clue where the term came from.
- Q: Seat has said to the previous owner that the car needs a new air mass meter and dump valve.I am putting a new air mass meter on it.Does it have a dump valve.I know very little on this subject.
- every turbo will have a dump valve(waste gate) to regulate the boost to the engine Dump valves are fitted to the engines of turbo charged cars and sit between the turbo outlet and the throttle body. When transitioning from a boosted state to a closed throttle state (as in between shifts), due to inertia, the turbo continues to pressurize air, but the closed throttle prevents the compressed air from entering the engine. In this case the pressure exceeds the preset spring pressure in the dump valve and the excess pressure is bled off to atmosphere. Even with a dump valve the compressed air acts as a brake on the turbo (slowing it down), because the pressure on the backside of the turbo is at a higher pressure than on the front side (and the air actually wants to flow through the turbo backwards). A blowoff valve is a more elegant solution to this problem by allowing the turbo to freewheel when the throttle is closed (equalizing the pressure on both sides of the turbo). Unlike a dump valve a blowoff valve can be used at multiple boost settings without reconfiguration. Blowoff valves are sometimes incorrectly called dump valves because they serve a similar function, but they are very different solutions to the same problem.
- Q: Does the pneumatic butterfly valve need electricity?
- Yes, for emergency power off, use the 24V power belt with pneumatic butterfly coil to allow pneumatic valve to work
- Q: How to calculate the size of the manual butterfly valve?
- I don't know what size you mean, and what about DN in diameter, such as DN125, which means 125 cm in diameter
- Q: What are the functions and uses of butterfly valves?
- Industrial butterfly valve features, capable of high temperature, applicable pressure range is higher, the valve nominal diameter is large, the valve made of carbon steel, the valve plate sealing ring using metal rings instead of rubber rings. Large high temperature butterfly valve welded by steel plate, mainly used for high temperature smoke duct and gas pipe.Construction: mainly composed of valve body, valve stem, disc and sealing ring. The valve body is cylindrical and has short axial length and is internally provided with a plate.
- Q: The difference between the directly buried gate and the flange valve and butterfly valve
- The flange gate valve is stable and reliable when used in the pipeline, so the flange gate valve is used on the high pressure pipeline.Butterfly valve refers to the closure of parts (valve or butterfly plate) as the disk, around the valve shaft to achieve rotation and closing of a valve, the main cut off on the pipe and throttling role. Butterfly valve headstock is a disc shaped disc, in the valve body around its own axis of rotation, so as to achieve the purpose of opening or closing or regulation. Butterfly valve used in furnace, coal gas, natural gas, liquefied petroleum gas, city gas, hot and cold air, chemical smelting and power generation environmental protection engineering system, conveying a variety of corrosive and non corrosive media pipeline, used to adjust and cut off the media flow.
- Q: e.g. a patient with a prosthetic aortic valve and a patient with a prosthetic mitral valve. Also, can you get stenosis of mechanical valves or just tissue grafts?Thanks!
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Ductile Iron wafer butterfly valves DN250
- Ref Price:
-
- Loading Port:
- Tianjin
- Payment Terms:
- TT OR LC
- Min Order Qty:
- 100 set
- Supply Capability:
- 80000 set/month
OKorder Service Pledge
Quality Product, Order Online Tracking, Timely Delivery
OKorder Financial Service
Credit Rating, Credit Services, Credit Purchasing
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