D373HOn the basis of the introduction of foreign advanced technology, worm gear driven double clip type hard seal butterfly valve PN10 ~ PN25 is a precision J-shaped elastic seal ring and three eccentric multi-level metal hard seal structure. It is widely used in the industrial pipelines of metallurgy, electric power, petrochemical, water supply and drainage, municipal construction and other industrial pipelines with medium temperature ≤ 425 ℃ for regulating flow and carrying off fluid. The valve adopts three eccentric structure. The valve seat and disc sealing surface are made of different hardness and stainless steel. It has good corrosion resistance and long service life. The valve has bidirectional sealing function. The product meets the national GB / T13927-92 valve pressure test standard.

1. The valve adopts three eccentric sealing structure, the valve seat and butterfly plate almost have no wear, with the sealing function of more and more tight.
2. The seal ring is made of stainless steel, which has the double advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance and long service life under low and high temperature conditions.
3. The sealing surface of disc plate is made of hardfacing cobalt base cemented carbide, which is wear resistant and has long service life
4. Large size butterfly plate adopts quilting frame structure with high strength, large flow area and small flow resistance.
5. The valve has two-way sealing function. It is not limited by the flow direction of medium or affected by the space position. It can be installed in any direction.
6. The driving device can be installed in multiple positions (90 ° or 180 ° rotation), which is convenient for users.

D373HMain technical parameters of worm gear driven double clip type hard seal butterfly valve PN10 ～ PN25

Nominal diameterDN（mm)	50～2000
Nominal pressurePN（Mpa)	0.6	1.0	1.6	2.5
Sealing test(Mpa)	0.66	1.1	1.76	2.75
strength test(Mpa)	0.9	1.5	2.4	3.75
Applicable temperature	Carbon steel: - 29 ℃～ 425 ℃, stainless steel: - 40 ℃～ 650 ℃
Applicable media	Water, air, natural gas, oil and weak corrosive fluid
Leakage rate	In accordance with GB / T13927-92
Driving mode	​Worm gear drive, electric, pneumatic and hydraulic

 

D373HMaterials of main parts and components of worm gear driven double clip type hard seal butterfly valve PN10 ～ PN25

Part name	Material Science
valve body	WCB、Alloy steel, stainless steel、QT450-10
Disc	WCB、Alloy steel, stainless steel、QT450-10
Valve shaft	Stainless steel, alloy steel
	Stainless steel ring
filler	Flexible graphite

D373HWorm gear drive double clip type hard seal butterfly valve PN10 ～ PN25 adopts standard

Manufacturing standards	JB/T 8527-97
Flange standard	GB9113-2000
Structural length standard	GB12221-89
Inspection standard	GB/T 13927-92

 

D373HWorm gear drive double clip type hard seal butterfly valve PN10 ～ PN25 main external connection dimension (mm) nominal diameter (DN) main dimension flange size and bolt specification1.0MPa1.6MPa2.5MPaLHH1D14-Ф－MD14-Ф－MD14-Ф－M5043350112125Ф18125Ф18125Ф186546370115145Ф18145Ф18145Ф188049380120160Ф18160Ф18160Ф1810056420138180Ф18180Ф18190Ф2312564460164210Ф18210Ф18220Ф2715070555175240Ф23240Ф23250Ф2720071605208295M20295M20310M2425076680243350M20355M24370M2730083800283400M20410M24430M2735092835310460M20470M24490M30400102915340515M24525M27550M33450114960380565M24585M27600M335001271020410620M24650M30660M336001541225470725M27770M33770M367001651355550840M27840M33875M398001901470640950M30950M36990M4590020315457101050M301050M361090M45100021617957701160M331170M391210M52120025419658901380M361390M451420M52

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.