Pneumatic midline 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 midline butterfly valve

  • [Valve model]: D671X，D641X，D671F46，D641F46
  • [Diameter specification]: DN50～DN1200
  • [Structure]: Medium type (wafer type, flange)
  • [Valve body material]: Ductile iron, cast steel WCB, stainless steel 304, 316
  • [Nominal pressure]: PN6、PN10、PN16
  • [Applicable temperature]: -40℃～180℃
  • [Application Scope]: Gas, water, oil, corrosive medium, etc
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  • Pneumatic midline butterfly valve

Product features

Pneumatic midline butterfly valve refers to a straight line formed between the rotating center of butterfly plate (i.e. the center of valve shaft) and the center of valve body, which is connected to the pneumatic actuator by direct connection. According to the different connection methods, it can be divided into pneumatic midline butterfly valve and pneumatic flange midline butterfly valve. The disc has automatic centering function (up and down, left and right), The sealing form is usually made into sealing structure, and the common sealing materials are rubber, polytetrafluoroethylene, etc. The disadvantage is that the opening and closing of the butterfly plate and the valve seat are always in a squeezed state, which is easy to scratch and causes rapid wear.
Pneumatic midline butterfly valve structure diagram
Performance characteristics of pneumatic midline butterfly valve:
 
The contact surface of the upper and lower ends of the butterfly plate of the pneumatic midline butterfly valve is relatively wide, the friction force is large when opening and closing, and the torque switch is also relatively large. Regardless of whether the valve is open or closed, the sealing surface of the butterfly plate and the valve core and the lower end of the valve seat are in a sealed and compressed state, which has excellent sealing performance.
 
Pneumatic midline butterfly valve application:
 
The pneumatic midline butterfly valve is widely used under the working conditions below 1.6MPa because of its simple structure, no directional sealing restrictions, the same effect of center symmetric (Type I) two-way sealing, small flow resistance, small switching torque, and pressure bearing capacity positioned as medium and low pressure. Generally, there is no requirement for direction during installation, which can be repaired and disassembled on site, and the sealing ring can be replaced without disassembling all valves.
 
Internal structure diagram of pneumatic midline butterfly valve
Pneumatic midline butterfly valve structure diagram

technical parameter

Nominal diameter: DN50~1200 (mm)
Nominal pressure: PN0.6, 1.0, 1.6, 2.5MPa
Connection type: wafer type Flange connection
Structure type: central line structure
Flow characteristics: approximate quick opening type
Action range: 0~90 °
Leakage: 10-4 of Kv according to GB/T4213-92, soft seal: zero leakage
Basic error: with positioner: less than ± 2% of full stroke
Return difference: with positioner: less than ± 2% of full stroke
Equipped with actuator: GT, AT, AW series single double acting pneumatic actuator
Control mode: switch type (switch two position control), regulating type (4~20mA control)
  
 
Parameters of pneumatic midline butterfly valve accessories:
Actuator model GT, AT, AW series single and double acting pneumatic actuators
Air supply pressure 0.4～0.7MPa
air connection G1/4"、G1/8"、G3/8"、G1/2"
ambient temperature -30～+70℃
Form of action Single acting actuator, double acting actuator
Optional Accessories Positioner, solenoid valve, air filter pressure reducer, retaining valve, travel switch, valve position transmitter, handwheel mechanism, etc

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.