D671FThe products of pneumatic soft seal double clip butterfly valve pn6 ~ PN16 are composed of PTFE seal butterfly valve, carbon steel or stainless steel valve plate and valve stem. It is suitable for water supply and drainage and gas pipelines with temperature ≤ 120 ℃, such as food, medicine, chemical industry, petroleum, electric power, light textile, papermaking, etc. The main features of pneumatic soft seal butterfly valve are:

1. Novel and reasonable design, unique structure, light weight and quick opening and closing.

2. Small operating torque, convenient operation, labor saving and dexterous.

3. It can be installed in any position and easy to maintain.

4. The sealing element can be replaced, the sealing performance is reliable, and the two-way sealing is zero leakage.

5. The sealing material has the characteristics of aging resistance, corrosion resistance and long service life.

Nominal diameter		50～2000
Nominal pressure	PN（MPa）	0.6	1.0	1.6
Test pressure	strength test	0.9	1.5	2.4
	Sealing test	0.66	1.1	1.76
	Airtight seal test	0.6	0.6	0.6
Applicable media	Air, water, sewage, steam, gas, oil, etc.
Applicable media	Manual, worm gear drive, pneumatic drive, electric drive.

Part name	Material Science
valve body
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

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.