Double eccentric butterfly valve
Product advantages
Strict selection of materials
Strict material selection, high-quality materials, raw material pouring, high-temperature forging process, beautiful appearance and assured quality
Waterproof and dustproof
Good sealing, waterproof and dustproof, good gloss and texture, toughness and high hardness, strong oxidation resistance, and good weather resistance stable job
Reasonable structure, scientific design, stable operation, unrestricted medium flow, no disturbance, no pressure reduction, long life
Double eccentric butterfly valve
Product description This series of double eccentric butterfly valves are welded with selected materials. Its novel structure is designed using the two-dimensional eccentric principle. The valve seat adopts a soft and hard seal compatible structure, with advanced technology and exquisite processing.
Product usage Mainly used in VOC industrial waste gas treatment industries, furniture factories, coating factories, paint factories, tobacco, flexible packaging, chemical industry, coal chemical industry, coking, new materials, rubber, electronics, medicine, and waste incineration systems as waste gas and flue gas sealing cut off effect.
Features
1. Small fluid resistance.
2. The external force required for opening and closing is small.
3. The flow direction of the medium is not restricted.
4. When fully open, the sealing surface is less eroded by the working medium than the stop valve.
Working principle The nominal pressure of the valve is 0.1MPa. The ventilation butterfly valve is used to connect pipelines, open and close, or regulate the flow of media. Usage introduction: The sealing material of the ventilation butterfly valve is made of the same material as the valve body and is processed into a sealing ring. The driving methods include handle, turbine, bevel gear, electric, pneumatic, etc.
Product advantages
1. Electric opening and closing, with arbitrary adjustment, check and cut-off functions. Easy to operate, safe and reliable.
2. The electric flange butterfly valve can continuously realize slow opening, fast opening or fast closing and slow closing actions, and effectively prevents the backflow of the medium at the pump outlet and the generation of water hammer.
Valve overall structure
There is a reliable shaft retaining ring in the middle of the manual valve
The actuator can be mounted directly and rigidly
PTFE V-shaped packing, graphite asbestos packing also available
Body inserts prevent seat wear and corrosion
The rotation of the butterfly plate does not take the valve seat as the fulcrum, which reduces torque and valve seat wear.
The butterfly plate design allows this valve to have a lower maximum torque point than conventional valves
The flat top of the shaft shows the correct position of the butterfly plate
Adjusting the packing will not load the valve seat
PTFE-lined stainless steel bearings are highly corrosion-resistant and self-lubricating
Thrust washers maintain the center position of the disc
The welded pin prevents choke, eddy currents and it will not loosen due to vibration.
The pin connection between the shaft and butterfly valve reduces shear stress to a minimum and avoids leakage.
Product features
Fire resistant construction
Fire-resistant valves are fire tested in accordance with API 607 4th Edition and BS 6755 Part 2.
The shaft is fixed and reliable
The top of the 2"-24" (DN50-600) shaft is equipped with a fixed ring to prevent the upper part of the shaft from moving out of the gland when the shaft breaks accidentally.
CE marked valves available
Valves that comply with the European Community Pressure Vessel Directive (PED) 97/23/EC, with CE marking and documentation, are available. The valve structure is ANSi Class 150 or Class 300 standard or fireproof. Its operating torque, construction options and valve dimensions are exactly the same as standard ANSI Class 150 and Class 300.
Valve seat is easy to repair and maintain
The valve seat can be replaced by simply removing the insert without disassembling the butterfly plate and shaft.
Both switches and controls
1. Has excellent control characteristics.
2. Equal percentage change in flow characteristic curve
3.Wide adjustment range.
4. Can still be tightly sealed even when used for control
5. The standard single flange butterfly valve with lugs can be used at either end of the pipeline terminal within the entire pressure and temperature range.
Complete supply, unified responsibility
1. The valve driving device and accessories can be installed together and provided uniformly.
2. Can be provided with electric devices, worm gear devices, double-acting pneumatic devices or reset pneumatic devices such as springs, as well as various accessories, including limit devices, solenoid valves and positioners.
3. Provide OEM services.
Technical Parameters
1. Valve seat rating The valve seat rating indicated on the curve table is for the valve seat only and is based on the pressure difference across the disc when the valve is fully closed. These ratings serve as a guide for use under common conditions. Based on past experience, through improvements and changes to other valve seat materials, the ratings used can be higher.
2. Valve body rating The maximum operating pressure of the valve body and the test pressure of various valve body materials are shown in the valve body pressure rating table below. The actual operating pressure is determined based on the valve seat rating. The test pressure is the pressure of the static pressure test when the butterfly plate is opened.
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