D941W-0.5CThe electric ventilation flange butterfly valve is suitable for two position cutting off. The valve is directly connected to the actuator. The electric actuator can be controlled by inputting 220 VAC power without servo amplifier. Butterfly valve is made of steel plate welding, which has the characteristics of short structure size, light weight and convenient installation. The valve has small driving torque, flexible opening and closing, and convenient operation. The valve body of the electric ventilation butterfly valve is provided with an oil sealing ring, so there is no visible gap between the sealing pairs and the leakage rate is small. The expansion gap between butterfly plate and valve body is large, which can effectively prevent the jamming caused by heat expansion and cold contraction. The valve can be equipped with a variety of driving devices, such as manual device, worm gear transmission device, pneumatic device, electric device. Ventilation butterfly valve is widely used in metallurgy, petrochemical, electric power, building materials, mining and other industrial pipelines, to control or regulate medium gas.

D941W-0.5CMaterial of main parts of electric ventilation flange butterfly valve

Part name	valve body	Valve plate	Valve shaft
Material Science	carbon steel	carbon steel	Carbon steel, stainless steel

D941W-0.5CMain external connection dimensions of electric ventilation flange butterfly valve（mm)

Nominal diameterDN	50	65	80	100	125	150	200	250	300	350	400	450	500	600	700	800	900	1000
L	90	90	100	115	130	140	150	250	270	290	310	330	350	390	430	470	500	550
H2	63	70	83	105	115	137	164	206	230	248	289	320	343	413	478	525	585	640
H1	530	530	565	600	640	705	775	945	1070	1140	1210	1335	1415	1605	1844	2040	2255	2388
D	140	160	190	210	240	265	320	375	440	490	540	595	645	755	860	975	10755	1175
D1	110	130	150	170	200	225	280	335	395	445	495	550	600	705	810	920	1020	1120
n-φd	4-14	4-14	4-18	4-18	8-18	8-18	12-18	12-22	12-22	16-22	16-22	20-22	20-26	24-26	24-30	24-30	24-30	28-30

 

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.