D373HOn the basis of introducing foreign advanced technology, the worm gear pair clamp type stainless steel butterfly valve adopts the precise three eccentric multi-level metal hard sealing structure. It is widely used in metallurgy, electric power, petrochemical, water supply and drainage, municipal construction and other industrial pipelines with medium temperature ≤ 425 ℃ for regulating flow and carrying 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 valve body is made of stainless steel, which has the dual advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance and long service life, no matter at low or high temperature.
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 and the influence of space position when installing. It can be installed in any direction

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 valve body is made of stainless steel, which has the dual advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance and long service life, no matter at low or high temperature.
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.

D373HMain external connection dimensions of worm gear clamp type hard seal stainless steel butterfly valve PN10 ～ PN25(mm)

Nominal diameter(DN)	Main dimensions			Flange size and bolt specification
				1.0MPa		1.6MPa		2.5MPa
	L	H	H1	D1	4-Ф－M	D1	4-Ф－M	D1	4-Ф－M
50	43	350	112	125	Ф18	125	Ф18	125	Ф18
65	46	370	115	145	Ф18	145	Ф18	145	Ф18
80	49	380	120	160	Ф18	160	Ф18	160	Ф18
100	56	420	138	180	Ф18	180	Ф18	190	Ф23
125	64	460	164	210	Ф18	210	Ф18	220	Ф27
150	70	555	175	240	Ф23	240	Ф23	250	Ф27
200	71	605	208	295	M20	295	M20	310	M24
250	76	680	243	350	M20	355	M24	370	M27
300	83	800	283	400	M20	410	M24	430	M27
350	92	835	310	460	M20	470	M24	490	M30
400	102	915	340	515	M24	525	M27	550	M33
450	114	960	380	565	M24	585	M27	600	M33
500	127	1020	410	620	M24	650	M30	660	M33
600	154	1225	470	725	M27	770	M33	770	M36
700	165	1355	550	840	M27	840	M33	875	M39
800	190	1470	640	950	M30	950	M36	990	M45
900	203	1545	710	1050	M30	1050	M36	1090	M45
1000	216	1795	770	1160	M33	1170	M39	1210	M52
1200	254	1965	890	1380	M36	1390	M45	1420	M52

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.