Pneumatic hard seal 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 hard seal butterfly valve

  • [Valve model]: D643H，D673H
  • [Diameter specification]: DN50～DN1200
  • [Structure]: Three eccentric hard seal (wafer type, flange)
  • [Valve body material]: Carbon steel WCB, stainless steel 304, stainless steel 316
  • [Nominal pressure]: PN10、PN16、PN25、PN40
  • [Applicable temperature]: -40℃～450℃
  • [Application Scope]: Water, steam, oil, acid corrosivity, etc
Consult the manufacturer Online Message
  • Pneumatic hard seal butterfly valve

Product features

The pneumatic hard seal butterfly valve is a long-life, high-quality butterfly valve. It is designed according to the three-dimensional eccentric principle, and is mainly composed of flange or wafer type hard seal butterfly valve and pneumatic actuator. The valve seat and disc sealing surface are made of metal materials or stainless steel with different hardness, which has the advantages of high temperature resistance, corrosion resistance, wear resistance, etc. The pneumatic hard seal butterfly valve adopts a multi-level structure compatible with hard and soft seals, which can ensure excellent sealing performance no matter in low temperature or high temperature conditions, and there is no friction between the disc plate and the valve seat when the valve is opened and closed, greatly improving the service life of the butterfly valve. Pneumatic hard seal butterfly valve is widely used in pipelines of power, oil, steam, air, sewage and other media, and is the best device for on-off control or flow regulation.
Pneumatic hard seal butterfly valve
Pneumatic wafer type hard seal butterfly valve Pneumatic flange hard seal butterfly valve

Performance characteristics of pneumatic hard seal butterfly valve:
 
1. The three eccentric principle structure is adopted, and there is almost no friction between the valve seat and the disc plate when opening and closing, which improves the service life.
2. Unique structure, flexible, labor-saving, convenient operation, not affected by high and low medium pressure, and reliable sealing performance.
3. It can be divided into pneumatic wafer type hard seal butterfly valve and pneumatic flange hard seal butterfly valve, which meet different connection modes and are easy to install in the pipeline.
3. The seal is composed of soft and hard metal sheets, which has the dual advantages of metal seal and elastic seal. It has excellent sealing characteristics both at low temperature and high temperature.
5. The butterfly valve is equipped with a sealing adjustment device. If the sealing performance declines after long-term use, the original sealing performance can be restored by adjusting the disc sealing ring close to the valve seat, greatly improving the service life.


Structure Diagram of Pneumatic Wafer Type Hard Seal Butterfly Valve Structure Diagram of Pneumatic Flange Hard Seal Butterfly Valve
Difference between pneumatic hard seal butterfly valve and pneumatic soft seal butterfly valve:
 
1. Soft seal can be used in low pressure - normal pressure, and hard seal can be used in medium and high pressure conditions.
2. Soft seal can be used in low temperature and normal temperature environment, while hard seal can be used in low temperature, normal temperature and high temperature environment.
3. Soft sealing butterfly valves are mostly of medium linear structure, while hard sealing butterfly valves are generally of single eccentric, double eccentric and triple eccentric structure.
4. The sealing performance of soft sealing butterfly valve is better than that of three eccentric hard sealing butterfly valve, but the three eccentric butterfly valve can maintain good sealing under high pressure and high temperature environment.
 
Advantages and disadvantages of pneumatic hard seal butterfly valve and pneumatic soft seal butterfly valve:

Hard sealing butterfly valve has a long service life, but its sealing performance is relatively worse than that of soft sealing.
The soft seal butterfly valve has the advantages of good sealing performance and the disadvantages of easy aging, wear and short service life.
Soft sealing butterfly valves are mostly suitable for opening, closing and regulating corrosive pipelines at normal temperature, while hard sealing butterfly valves are mostly used for heating, gas supply, gas, oil, acid and alkali and other environments.
    

technical parameter

Nominal diameter DN50～DN1200(mm)
Pressure rating PN1.0、1.6、2.5、4.0MPa
Connection mode Wafer type, flange connection
Sealing form Metal hard seal
Drive mode Air source driven, compressed air 5~7bar (with handwheel)
Action range 0～90°
body material Carbon steel, stainless steel 304, stainless steel 316
Workplace Corrosivity of water, steam, oil, acid, etc. (high pressure and high temperature)
temperature range Carbon steel: - 29 ℃~450 ℃ Stainless steel: - 40 ℃~450 ℃
control mode Switch mode (switch two position control, Air to open, air to close ）Intelligent regulating type (4-20mA analog signal) Spring return
 
 
Pneumatic hard seal butterfly valve actuator:

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: air to close (B) - valve position open (FO) in case of air loss; Air to open type (K) -- valve position closed in case of loss of air (FC)
Double acting actuator: air to close (B) - valve position is kept (FL) in case of loss of air; Air to open type (K) -- valve position is kept (FL) in case of loss of air
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.