D341H、D341W The type pn5-pn10 flange ventilation butterfly valve is mainly used in the dust containing cold air or hot air gas pipeline of ventilation and environmental protection engineering in metallurgy, chemical industry, building materials, power station, glass and other industries, as a gas medium to adjust the flow or cut-off device.

1. It is designed and manufactured by adopting the new structure form of welding the central line type 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;
2. There is no connecting rod, bolt, etc. inside, it works reliably and has long service life. It can be installed in multi position, not affected by the medium flow direction;

D341H、D341W Connection dimensions of PN5 ～ PN10 flange ventilation butterfly valve

Nominal diameter	Main dimensions and connection dimensions
	L	D1	D	Z-d	H	H0	A	B
50	108	110	140	4-14	70	215	270	65
65	112	130	160	4-14	80	235	270	65
80	124	150	190	4-18	95	263	270	65
100	127	170	210	4-18	105	283	270	65
125	140	200	240	8-18	120	313	310	65
150	140	225	265	8-18	132.5	338	310	65
200	152	280	320	8-18	160	493	365	90
250	165	335	375	12-18	187.5	550	365	90
300	178	395	440	12-22	220	615	365	90
350	190	445	490	12-22	245	678	365	90
400	216	495	540	16-22	270	727	365	90
450	222	550	595	16-22	297.5	782	365	90

尺寸图

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.