Product Description
[Overview]
Multi level hard sealed butterfly valve series products are long-lasting and energy-saving butterfly valves. Its structure is designed using the three-dimensional core principle, and the valve seat adopts a multi-level structure that is compatible with hard and soft seals. This product consists of main components such as valve body, butterfly plate, multi-level valve seat, valve stem, and transmission mechanism. Therefore, it is widely used in pipelines for corrosive media such as metallurgy, electricity, petroleum, chemical, air, gas, combustible gases, and water supply and drainage.
Characteristics and principles of three eccentricities
1. Deviation from the center of the pipeline
2. Deviation from the center of the sealing surface
3. Tilted cone shape
When the valve is opened, the butterfly plate comes into instant contact with the valve seat when it is closed, and the eccentricity 1 and eccentricity 2 of the butterfly plate quickly detach from the valve seat, reducing the wear of the sealing pair, reducing the friction torque, and making it flexible to open. Eccentric cone surface 3 enables the butterfly plate to pass through the inner hole of the valve seat and achieve contact sealing when the valve is opened or closed. In addition, the rotation radius of the conical butterfly plate is greater than the rotation radius of the sealing pair contact position, so the butterfly plate will become tighter and tighter when the valve is closed, which can achieve self-locking and prevent the butterfly plate from exceeding its position.
[Structural Features]
Due to the three-dimensional eccentric principle design used in this butterfly valve product, the spatial motion trajectory of the sealing surface is idealized, and there is no friction or interference between the sealing surfaces. In addition, the appropriate selection of sealing materials ensures reliable sealing, corrosion resistance, high temperature resistance, and wear resistance of the butterfly valve.

[Adopting standards]
Design standard: GB/T12238-1989; JB/T8527-1997
Flange connection size:
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
[Executing Agency]
Adopting a new series of GT type pneumatic actuators, with double acting and single acting (spring reset), gear transmission, safe and reliable; The large-diameter valve adopts a series of AW type pneumatic actuators with fork type transmission, with a reasonable structure and large output torque. It has double acting and single acting types
1. Gear type dual piston, with large output torque and small volume.
2. The cylinder is made of aluminum material, which is lightweight and aesthetically pleasing.
3. Manual operating mechanisms can be installed at the top and bottom.
4. The rack and pinion connection can adjust the opening angle and rated flow rate.
5. The actuator can be equipped with live signal feedback indicators and various accessories to achieve automated operation.
7. The adjustable screws at both ends provide a ± 4 ° adjustable range for standard products between 0 ° and 90 °. Ensure synchronization accuracy with the valve.
[Technical Parameters]

Nominal Diameter	DN（mm）	50~2000				50~500
nominal pressure	PN（MPa）	0.6	1.0	1.6	2.5	4.0
test pressure	strength test	0.9	1.5	2.4	3.75	6.0
	Sealing test	0.66	1.1	1.76	2.75	4.4
	Airtight seal test	0.6	0.6	0.6	0.6	0.6
leakage rate	＜ 0.1 × DNmm3/s (compliant with GB/T13927-92 standard)
Temperature	Carbon steel: -29 ℃~425 ℃ Stainless steel -40 ℃~600 ℃
Applicable Medium	Air, water, steam, coal gas, oil products, as well as acids, alkalis, salts with weak corrosive media, etc
Drive form	Worm gear transmission, pneumatic transmission, electric transmission

The material of the main components
Part name and material
Valve body made of cast iron, stainless steel, chromium molybdenum steel, alloy steel
Butterfly plate cast steel, alloy steel, stainless steel, chromium molybdenum steel
Multi layer combination of sealing ring stainless steel and high-temperature resistant asbestos board
Valve stem made of 2Cr13, 1Cr13 stainless steel, and chromium molybdenum steel
Bearing austenitic stainless steel, 304 nitride
Filler flexible graphite