TD341WManual worm gear carbon steel ventilation 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. 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.

TD341WMain performance parameters of manual worm gear carbon steel ventilation butterfly valve

Nominal pressure（Mpa)	0.05MPa	Medium temperature	-30℃～-350℃
strength test	0.1MPa	Applicable media	Cold and hot air, flue gas
Medium velocity	25m/s	Leakage rate	3%

TD341WMain parts materials of manual worm gear carbon steel ventilation butterfly valve

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

TD341WMain dimensions of manual worm gear carbon steel ventilation butterfly valve（mm)

DN	D	D1	L	L1	L2	n-Фd	b
300	405	370	120	716	220	8-12	10
350	455	420	140	786	240	8-14	10
400	505	470	140	924	270	12-18	10
450	570	530	160	999	295	12-18	10
500	620	580	160	1079	325	12-18	10
600	720	680	180	1140	380	16-18	12
700	820	780	180	1240	430	16-18	12
800	920	880	200	1350	490	16-18	12
900	1040	990	200	1450	540	16-18	14
1000	1140	1090	220	1550	590	20-18	14
1100	1240	1190	220	1800	640	20-18	14
1200	1340	1290	240	1900	690	20-18	14
1300	1440	1390	240	2020	760	20-18	16
1400	1540	1490	260	2120	810	24-18	16
1500	1640	1590	260	2220	860	24-18	16
1600	1740	1690	280	2390	980	24-18	16
1700	1840	1790	280	2590	1030	28-22	16
1800	1940	1890	300	2709	1096	28-22	16
1900	2040	1990	300	2826	1146	32-22	16
2000	2150	2090	320	2926	1196	32-26	16
2200	2360	2300	340	3126	1296	36-26	16
2400	2560	2500	360	3326	1396	36-26	18
2600	2760	2700	380	3526	1496	40-26	18
2800	2960	2900	400	3726	1596	40-26	18
3000	3190	3110	400	4098	1698	44-30	18
3200	3390	3310	440	4338	1798	44-30	20
3400	3590	3510	440	4578	1898	48-30	20
3600	3790	3710	480	4780	1998	48-30	20
3800	4000	3910	480	5000	2098	52-30	22
4000	4210	4120	520	5200	2210	52-30	22

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.