Pneumatic three eccentric butterfly valve - Shanghai Dongfeng Pump Valve Factory - 上海花千坊_上海龙凤花坛_夜上海最新论坛

Pneumatic three eccentric butterfly valve

  • [Valve model]: D643H，D673H
  • [Diameter specification]: DN50～DN1200
  • [Structure]: Three eccentric hard seal (wafer type, flange)
  • [Valve body material]: Cast steel WCB, stainless steel 304, stainless steel 316
  • [Nominal pressure]: PN10、PN16、PN25、PN40
  • [Applicable temperature]: -40℃～450℃
  • [Application Scope]: Water, air, steam, corrosive medium, oil and food, etc
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  • Pneumatic three eccentric butterfly valve

Product features

Pneumatic three eccentric butterfly valve is composed of pneumatic transmission mechanism and three eccentric butterfly valve. It can be divided into flange or wafer type according to different connection modes. The material can be divided into cast iron, cast steel, stainless steel, etc. The valve body is of three eccentric structure. The valve plate and sealing mechanism are of unique design, which has excellent cutting performance and durability. At the same time, it has dual functions of cutting off and regulating. It is of long service life Energy saving butterfly valve. As the closing of pneumatic triple eccentric butterfly valve is the same as that of gate valve, it is completed by torque, that is, the greater the torque of valve closing, the better the tightness of valve seat, so some people call triple eccentric butterfly valve 90 ° rotary gate valve.

 
Application range of pneumatic three eccentric butterfly valve:
 
Three eccentric pneumatic butterfly valve is applicable to water, sewage, sea water, air, steam, gas, combustible gas, corrosive medium, oil products, food and other media, and the maximum operating temperature can reach 550 ℃. It is widely used in pipelines of different media such as petroleum, chemical industry, metallurgy, power, food, medicine, water supply and drainage, gas transmission, etc., to switch off or adjust the medium flow parameters.
Performance advantages of pneumatic three eccentric butterfly valve:
 
1. The three-dimensional eccentric sealing structure is adopted, the wear between the valve seat and the butterfly plate is small, and the sealing surface is wear-resistant, extending the service life;
2. According to the connection mode, it can be divided into pneumatic wafer type three eccentric butterfly valve and pneumatic flange three eccentric butterfly valve, which can be used in different process pipelines;
3. The butterfly plate of large diameter butterfly valve can adopt the structure of quilting frame, which is characterized by high strength, large flow area and small flow resistance;
4. The two-way pressure three eccentric multi-level hard sealing structure is adopted, which has the function of two-way sealing. The installation is not limited by the flow direction of the medium, nor affected by the spatial position, and can be installed in any direction;
5. It has the dual advantages of metal hard seal and elastic seal. It has excellent sealing performance, corrosion resistance, long service life and other characteristics no matter in low temperature or high temperature.

Outline structure of pneumatic three eccentric butterfly valve:
Pneumatic three eccentric butterfly valve structure
Structure Diagram of Pneumatic Flange Three Eccentric Butterfly Valve Structure Diagram of Pneumatic Wafer Three Eccentric Butterfly Valve

 
Structural principle of pneumatic three eccentric butterfly valve:

technical parameter

Nominal diameter DN50～DN1200(MM)
Nominal pressure PN1.0、1.6、2.5、4.0MPa
Connection type Wafer type, flange type
Sealing form Three eccentric metal hard seal
Air supply pressure 0.4~0.7Mpa
Action range 0～90°
Leakage 10-4 of Kv according to GB/T4213-92
body material Carbon steel, stainless steel 304, 316
Valve plate material Carbon steel, stainless steel 304, 316
Fundamental error With positioner: less than ± 2% of full stroke
Applicable temperature Carbon steel: - 29 ℃~400 ℃ Stainless steel: - 40 ℃~450 ℃
Actuator GT, AT, AW series single acting, double acting pneumatic actuators
control mode Switch two position mode (gas on and gas off), adjustable (4-20mA analog quantity control)

For a typical three eccentric pneumatic butterfly valve, except that the valve stem and valve plate have two eccentricities, the sealing surface of the valve plate and the valve seat is in the shape of an inclined frustum (this is the so-called third eccentricity of the three eccentric). When the valve is closed, the valve plate is pushed forward due to eccentricity, and there is no friction between the valve plate and the valve seat during the closing process. The valve plate is directly pressed on the valve seat, thus ensuring the service life of the valve; In addition, because the sealing ring of this valve (whether installed on the valve seat or valve plate) has a certain elasticity, and a small amount of clearance between the boss in the elastic ring and the elastic ring can make the elastic ring slightly displaced; When the valve is closed, the elastomer seal ring can automatically move to the position with the most uniform force under the action of the closing force; In addition, a small amount of deformation of the elastic ring makes the sealing ring at the valve seat evenly stressed to achieve the best sealing state.  

Quotation process

Valve price:

Due to the different requirements of order quantity, packaging and delivery method, and the fluctuation of the price of valve raw materials, the price of valves will have a big difference immediately, so our products have not been marked with prices on the website, please understand.

If you select a valve product on this website and need to know the price or obtain relevant technical information, please contact us. We will reply immediately, and can select appropriate valve products for you according to your requirements, so that your procurement process is easy and pleasant.

Quotation process:

1. Please fax the name (or product model) of the valve you selected, the required order quantity, packaging requirements, delivery time, your company name, your company location and contact information to 021-36311208 Or telephone: 021-60547555。

2. After receiving the customer's purchase list, our company will provide the customer with various services such as valve quotation "price list", model selection "valve model" and technical guidance as soon as possible.

3. Specific matters: delivery date, special requirements, etc.

Ordering Instructions

1、 If the customer has special requirements for the product, the following instructions must be provided in the order contract:
(1) Valve body material (such as plastic, cast steel, stainless steel...)
(2) Connection type (such as flange, thread, clamp, etc.)
(3) Nominal diameter, pipe size
(4) Ambient temperature and pressure range
(5) Power supply voltage, air supply pressure
(6) Fluid properties (including nominal pressure, temperature, viscosity or acid-base)
2、 The company configures various driving devices according to the special requirements of customers. (electric control, pneumatic control)
3、 If the customer provides the determined valve type and model, the customer should correctly explain the meaning and requirements of the model (see the description of valve model preparation for details), and sign the contract on the condition that both the supplier and the buyer have the same understanding.
4、 After the customer tells the required valve model, specification, quantity, delivery time and place, the deposit of 20% of the total amount or the full payment for goods shall be remitted to our company's account in time, and the rest of the payment for goods shall be remitted before shipment, so as to arrange shipment in time.
5、 After the purchase is confirmed, our company will produce in strict accordance with the delivery date. The product processing cycle is generally 3 to 30 days, depending on the type and quantity of the order, and the specific delivery time is subject to the contract. In order to ensure that the goods you ordered are in place in time, please try your best to order earlier.
6、 Our company provides network distribution services according to the needs of customers, delivering goods to the branches (offices) of customers in major cities, and implementing door-to-door delivery services. After the products are accepted, our company will provide after-sales service.