D641W-6CPneumatic flange type high temperature ventilation butterfly valve with external bearing is a kind of non airtight butterfly valve, which is widely used in the production process of building materials, metallurgy, mining, electric power, waste incineration, etc., to connect, open and close or adjust the medium quality. The pneumatic high temperature ventilation butterfly valve with external bearing is designed and manufactured by adopting the new structure form of welding middle line disc plate and short structure steel plate. It has the advantages of compact structure, light weight, easy installation, small flow resistance, large flow capacity, avoiding the influence of high temperature expansion, and easy to operate. Pneumatic flange type high temperature ventilation butterfly valve with external bearing is more suitable for the gas containing dust because of its external bearing. The external bearing overcomes the problem of valve jamming and resistance caused by dust, improves the production efficiency, and the setting of heat sink overcomes the high temperature resistance of pneumatic actuator, which greatly reduces the heat conduction from high temperature to pneumatic actuator, which is suitable for pneumatic actuator Can adapt to the temperature. There is no connecting rod, bolt, etc. in the valve body, it works reliably and has a long service life. It can be installed in multi station, not affected by the flow direction of medium.

D641W-6CMaterial of main parts of pneumatic flange type high temperature ventilation butterfly valve with external bearing

Part name	Material Science
valve body	Cast steel, stainless steel, chromium nickel molybdenum titanium steel, chromium molybdenum titanium steel and other special materials
Disc	Cast steel, stainless steel, chromium nickel molybdenum titanium steel, chromium molybdenum titanium steel and other special materials
seal ring	Same as valve body
Stem	Carbon steel, stainless steel, Cr Ni Mo Ti steel
filler	Fluoroplastics, flexible graphite

Design standard: GB / t12238-1989 JB / t8692-1998
Flange connection size: GB / t9115.1-2000
Structural length H: GB / t12221-1989
Pressure test: GB / t13927-1992; JB / t9092-1999

1. Before installation, check whether the specification, pressure, temperature and corrosion resistance of butterfly valve meet the use requirements. Check whether the parts are damaged or loose.
2. The butterfly valve can be installed on the pipeline at any angle and should be closed; when welding the pipe flange, the valve sealing port should be blocked with a plate to prevent particles and sundries from damaging the sealing surface. After welding, take down the valve, clean the valve sealing surface and pipe cavity, and then install the fixed valve.
3. Please pay attention to the pressure bearing direction when the valve is closed.
4. Before installation, the sealing surface (sealing surface at both ends, sealing surface of butterfly plate and sealing surface of valve seat) shall be thoroughly cleaned to remove dust and dirt.
5. Before installation, the butterfly valve should be air tested, and the opening and closing position should be flexible, and the opening and closing position should be consistent with the position indicated by the pointer.
6. Manual operation, clockwise is off, counter clockwise is on, pointer indication is in place, it is not allowed to open and close the valve with additional force.
7. During the pressure test of the valve, it is not allowed to use single flange for installation and pressure test, but double flange installation and pressure test must be adopted. The test pressure shall comply with GB / T13927-92.
8. The bolts shall be tightened symmetrically and alternately instead of separately.
9. The limit screw has been adjusted before delivery, so it is not allowed to adjust it easily. Please refer to the manual for electric drive device.
10. When the electric butterfly valve leaves the factory, the opening and closing stroke of the control mechanism has been adjusted. In order to prevent the wrong direction when the power supply is connected, the user should first manually open it to the half open position before connecting the power for the first time, and then press the inching switch to check that the direction of the indicator wheel is consistent with the opening direction of the valve.
11. If the valve is found to be open and closed abnormally, the cause shall be found out for repair and elimination, so as to prevent the valve from being damaged due to opening and closing by means of applying force.