Pneumatic bellows stop 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 bellows stop valve

  • [Valve model]: WJ641H、WJ641W、WJ641Y
  • [Diameter specification]: DN15-DN300
  • [Structure]: Bellows structure
  • [Valve body material]: Cast steel (WCB), stainless steel (304, 316, 316L)
  • [Nominal pressure]: PN10、PN16、PN25、PN40
  • [Applicable temperature]: -40℃～450℃
  • [Application Scope]: Steam, flammable and explosive, heat transfer oil, toxic medium, etc
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  • Pneumatic bellows stop valve

Product features

WJ641H/W pneumatic bellows stop valve is a high-performance, leak free, long-life stop valve. It adopts a soft, corrosion resistant, high temperature resistant dual metal bellows sealing structure, which effectively prevents the process fluid from eroding the valve stem. It is especially suitable for high-risk places with steam, heat transfer oil and toxic media. The pneumatic bellows stop valve completely eliminates the shortcomings of ordinary stop valves and quick aging and leakage of stem packing seals. It not only improves the energy efficiency, increases the safety of production equipment, reduces maintenance costs and frequent maintenance, but also provides a clean and safe working environment.
Structure Diagram of Pneumatic Bellows Stop Valve
 
Features of pneumatic bellows stop valve:
 
1. The pneumatic bellows stop valve adopts a bellows structure inside. The lower end of the stainless steel bellows is welded on the valve stem to prevent the process fluid from eroding the valve stem. The other end is placed between the valve body and the valve cover to form a static seal.
2. It realizes double sealing, stainless steel bellows protection sealing, and valve stem packing protection sealing. If the bellows fails, the valve stem packing will also avoid leakage.
3. The valve has no leakage under the condition of high temperature, high pressure and strong medium penetration.
4. The pneumatic bellows stop valve has a long service life, reduces maintenance times and reduces operating costs.
5. The valve has neither external leakage nor internal leakage, reducing energy loss and improving plant equipment safety.

technical parameter

Nominal diameter DN15～DN300(MM)
Nominal pressure PN1.0、1.6、2.5、4.0MPa
Connection type Flange connection
structural style Straight through
Drive type Pneumatic control (compressed air)
body material Carbon steel WCB, stainless steel 304, stainless steel 316, 316L
Applicable temperature -40℃～450℃
Sealing form Bellows seal
Applicable media Steam, flammable and explosive, heat transfer oil, toxic medium, etc
control mode Double acting (air to open, air to close) or single acting (normally open, normally closed)

Difference between pneumatic bellows stop valve and ordinary stop valve:
 
Electric bellows stop valves use sealed bellows that can be stretched and compressed instead of packing seals, which can effectively prevent leakage caused by packing loss. They are generally used for the transmission of highly permeable media, such as valves on hydrogen systems. As long as the bellows are not damaged, there is generally no leakage; The general stop valve is sealed with packing, which is easy to leak. The general stop valve is sealed with packing, and the stem and packing will slide, which is easy to leak (valve core) at low temperature.  

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.