D941HAs a new generation of speed regulating butterfly valve, the electric flange hard seal butterfly valve pn2.5 ~ PN10 has changed the traditional mode of changing the speed of butterfly plate by mechanical speed change from the design idea. According to the action characteristics of different positions of butterfly plate, a new design is made from the electric drive control. The electric flange butterfly valve adopts to change the frequency of the input current of the electric device, and then adjust the rotation speed and output torque of the electric device, so as to control the starting and closing speed of the butterfly plate, and realize the purpose of closing the butterfly plate in two stages of fast closing and slow closing, or opening in two stages of slow opening and fast opening. It has the same function as the hydraulic control butterfly valve. The valve is suitable for the pump outlet position of the pipeline with water and sea water as the closed-circuit valve and has the characteristics of check valve, so as to avoid and reduce the backflow of medium and water hammer impact in the pipeline system, and protect the pipeline. It is especially suitable for the occasions where the working power supply is very reliable, such as power plant and water plant.

1. Electric opening and closing, with arbitrary adjustment, check and cut-off functions. It is easy to operate, safe and reliable.
2. The valve can continuously realize the action of slow opening, fast opening or fast closing and slow closing, and effectively prevent the backflow of medium at the pump outlet and the generation of water hammer.
3. Energy saving drive, the same drive motor as ordinary butterfly valve can realize the function of high speed small torque in fast closing section and large torque in slow closing low section.
4. When installed at the pump outlet, the butterfly valve has the common function of check valve and gate valve, so one valve can replace two valves, saving installation space and pipe network cost.
5. Low flow resistance. When the valve is fully open, the flow resistance coefficient does not exceed 0.3, so it can save energy and reduce the operation cost of pipeline.
6. In case of accident or power failure, the butterfly valve can be opened and closed by manual operation.

D941HMain technical parameters of electric flange hard seal butterfly valve pn2.5 ～ PN10

Nominal pressure（MPa）		0.25	0.6	1.0
Nominal diameter（mm）		1000～2400	800～2400	500～1600
Test pressure	strength test	0.375	0.90	1.5
	Sealing test		0.66	1.1
Applicable media		Water, sea water
Applicable temperature（℃）		≤80℃
Installation mode		​Vertical and horizontal

D941HMaterials of main parts and components of electric flange hard seal butterfly valve pn2.5 ～ PN10

Part name	Material Science
valve body	Nodular cast steel, cast steel, alloy steel, stainless steel
Disc	Gray cast iron, nodular cast steel, cast steel, stainless steel and special materials
seal ring	All kinds of rubber, polytetrafluoroethylene
Stem	2Cr13、stainless steel
filler	O-ring, flexible graphite o

D941HExecutive standard for pn2.5 ～ PN10 electric flange hard seal butterfly valve

Design and manufacture	Flange connection size	Structural length	Pressure test
GB12238	GB2555-2526-8	GB12221	GB/T13927

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. If the configuration of driving device is electric or pneumatic, please refer to the manual of supporting 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.