DG673WType 310S, 2520 pneumatic bidirectional stainless steel high-temperature butterfly valve adopts a U-shaped stainless steel sealing ring, the precise elastic sealing ring and the polished butterfly plate are in three-dimensional eccentric contact. It solves the problem that the sealing surface of traditional eccentric butterfly valve is still in sliding contact friction at the moment of opening and closing from 0 ° to 10 ° and realizes the effect that the sealing surface of butterfly plate is separated at the moment of opening and the sealing effect is that the contact is closed, so as to prolong the service life and improve the sealing performance. Therefore, it is widely used in the pipeline of corrosive medium such as metallurgy, electric power, petroleum, chemical industry, air, gas, combustible gas and water supply and drainage with medium temperature ≤ 1200 ℃. It is a good Zui device for regulating flow and cutting off fluid.

1. The butterfly valve has the advantages of simple structure, compact structure, light weight, easy installation, disassembly and maintenance;
2. The butterfly valve has excellent sealing performance with stainless steel in low temperature;
3. After strict calculation of the three-dimensional eccentricity of the butterfly valve, the U-shaped seal ring has almost no friction with the butterfly plate, and has a long service life, and has the function of closing more tightly;
4. The sealing surface of butterfly plate adopts hardfacing cobalt based cemented carbide, which is wear-resistant and has long service life;
5. The butterfly valve has a unique structure, and the "on-off" can be completed only by turning the valve stem 90 degrees. The operation is flexible, convenient, labor-saving, not affected by the medium pressure, and the sealing performance is reliable;
6. High temperature, low temperature and corrosion resistance
7. 310S stainless steel is austenitic chromium nickel stainless steel, equivalent to China's 0Cr25Ni20, with good oxidation resistance and corrosion resistance. Because of the high percentage of chromium and nickel, it has much better creep strength, can work continuously at high temperature, and has good high temperature resistance. When the temperature exceeds 800, it begins to soften, and the allowable stress begins to decrease continuously. Zui has a high service temperature of 1200 ℃. Because of the high content of nickel (Ni) and chromium (CR), they have good oxidation resistance, corrosion resistance, acid and alkali resistance, and high temperature resistance. High temperature resistant steel pipes are specially used in the manufacture of electric furnace tubes. After the carbon content in austenitic stainless steel is increased, the strength is improved due to its solution strengthening effect. The chemical composition characteristics of austenitic stainless steel are based on chromium and nickel, adding molybdenum, tungsten, niobium and titanium, Because of its face centered cubic structure, it has high strength and creep strength at high temperature.

Design standard: GB / t12238-1989
Flange connection dimensions: GB / t9113.1-2000; GB / t9113.2-2000; GB / t9115.1-2000; GB / t9115.2-2000
Structural length: GB / t12221-1989
Pressure test: GB / t13927-1992; JB / t9092-1999
 

A new series of GT type pneumatic actuators are adopted, including double acting and single acting (spring return), gear transmission, safe and reliable; aw type pneumatic actuator fork type transmission is adopted for large diameter valves, with reasonable structure, large output torque, double acting and single acting
1. Gear type double piston, large output torque and small volume.
2. The cylinder is made of aluminum and gold, light in weight and beautiful in appearance.
3. Manual operation mechanism can be installed at the top and bottom.
4. Rack connection can adjust opening angle and rated flow.
5. The actuator can be equipped with live signal feedback indication and various accessories to realize automatic operation.
6. Is05211 standard connection provides convenience for product installation and replacement.
7. The adjustable range of 0 ° and 90 ° of standard product can be ± 4 ° by the adjustable joint screw at both ends. Ensure the synchronization accuracy with the valve.

The following accessories can be selected according to different control and requirements:
Cut off type accessories: single electric control solenoid valve, double electric control solenoid valve, limit switch feedback device.
Adjustable accessories: Electric positioner, pneumatic positioner and electric converter.
Air source treatment accessories: air filter pressure reducing valve, air source treatment triple piece.
Manual mechanism: hvsd manual operation mechanism

DG673WType 310S, 2520 pneumatic bidirectional stainless steel high temperature butterfly valve main external connection dimensions(mm)

Nominal diameter（DN)	Main dimensions			Flange size and bolt specification
				1.0MPa		1.6MPa
	L	H	H1	D1	4-Ф－M	D1	4-Ф－M
50	43	625	112	125	Ф18	125	Ф18
65	46	625	115	145	Ф18	145	Ф18
80	49	645	120	160	Ф18	160	Ф18
100	56	675	138	180	Ф18	180	Ф18
125	64	715	164	210	Ф18	210	Ф18
150	70	800	175	240	Ф23	240	Ф23
200	71	850	208	295	M20	295	M20
250	76	925	243	350	M20	355	M24
300	83	1035	283	400	M20	410	M24
350	92	1070	310	460	M20	470	M24
400	102	1190	340	515	M24	525	M27
450	114	1250	380	565	M24	585	M27
500	127	1290	410	620	M24	650	M30
600	154	1455	470	725	M27	770	M33
700	165	1585	550	840	M27	840	M33
800	190	1700	640	950	M30	950	M36
900	203	1965	710	1050	M30	1050	M36
1000	216	2015	770	1160	M33	1170	M39
1200	254	2250	890	1380	M36	1390	M45

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.