D643h Pneumatic Three Eccentric Butterfly Valve

• Customized: Customized
• Certification: ISO, API, CE
• Power: Manual
• Pressure: Medium Pressure
• Brand: Xuan Cheng
• Work Temperature: Normal Temperature
• Model NO.: D643H
• Material: Carbon Steel
• Medium: Water, Steam, Gas, etc
• Structure: Through
• Connection Mode: Flange
• Seal: Hard Seal
• Transport Package: Wooden Box
• Specification: DN50-DN800
• Trademark: xc
• Origin: China
• HS Code: 8412310090
• Production Capacity: 10000

Product Description

Overview of pneumatic three-eccentric butterfly valve
D643H pneumatic three eccentric butterfly valve is composed of pneumatic drive mechanism and three eccentric butterfly valve, according to the connection method can be divided into flange or clamp type, material is divided into cast iron, cast steel, stainless steel, valve body part with three eccentric structure, valve plate and sealing mechanism design is unique, has excellent cutting performance and durability, and simultaneously cut off, adjust the dual function, Is a long life, energy saving butterfly valve. Because the closing of the pneumatic three eccentric butterfly valve and gate valve is closed, it is completed by torque, that is, the greater the torque of the valve is closed, the better the sealing of the valve seat, so some people say three eccentric butterfly valve for 90° rotating gate valve.



Application range of pneumatic three eccentric butterfly valve
Three eccentric pneumatic butterfly valve is suitable for water, sewage, sea water, air, steam, gas, combustible gas, corrosive media, oil and food and other media, the highest working temperature can reach 550ºC. Widely used in petroleum, chemical, metallurgy, electric power, food, medicine, water supply and drainage, gas transmission and other different media of the pipeline, do switch off or adjust the medium flow parameters used.
Pneumatic three eccentric butterfly valve performance advantages
1, the use of three-dimensional eccentric sealing structure, seat and butterfly plate wear small, and sealing surface wear resistance, prolong the service life;
2, according to the connection mode is divided into pneumatic clamp type three eccentric butterfly valve and pneumatic flange three eccentric butterfly valve, can be used in different process pipelines;
3, large diameter butterfly valve disc can be quilted structure, with high strength, large flow area, flow resistance is small;
4, the bidirectional pressure three eccentric multi-level hard seal structure, with the function of bidirectional seal, installation is not limited by the medium flow direction, is not affected by the spatial position, can be installed in any direction;
5, with metal hard seal and elastic seal double advantages, no matter in low temperature and high temperature, has excellent sealing performance, corrosion resistance, long service life and so on.
Pneumatic three eccentric butterfly valve technical parameters

Nominal diameter	DN50 to DN1200(MM)
Nominal pressure	PN1.0, 1.6, 2.5, 4.0MPa
Connection form	Pair type, flange type
Sealed form	Triple eccentric metal hard seal
Air supply pressure	0.4 ~ 0.7 Mpa
Range of action	0 to 90°
Leakage	10-4 of the Kv value in GB/T4213-92
Body material	Carbon steel, stainless Steel 304, 316
Valve sheet material	Carbon steel, stainless steel 304, 316
Basic error	With positioner: less than ±2% of full stroke
Applicable temperature	Carbon steel: -29ºC ~ 400ºC stainless steel: -40ºC ~ 450ºC
Actuator	GT, AT, AW series single acting, double acting pneumatic actuators
Control mode	Two-position switch mode (gas on and gas off), adjustable type (4-20mA analog quantity control)

Pneumatic three eccentric butterfly valve structure principle




Typical three eccentric pneumatic butterfly valve, in addition to the stem and valve plate has two eccentricities, the sealing surface of the valve plate and seat is inclined round table shape (this is the so-called three eccentricities of the third eccentric). When the valve is closed, the valve plate is pushed forward because of the eccentricity, the valve plate and the valve seat do not produce friction in the closing process, the valve plate is directly pressed on the valve seat, so as to ensure the service life of the valve; In addition, because the valve seal ring (whether installed on the valve seat or valve plate) has a certain elasticity, and the elastic ring between the boss and the elastic ring there is a small amount of clearance can make the elastic ring slightly displacement; When the valve is closed, by the closing force, the elastomeric sealing ring can automatically move to the most uniform force position; Coupled with a small amount of elastic ring deformation, so that the seat at the seal ring uniform force, to achieve the best seal state.