Pneumatic diaphragm double seat regulating 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 diaphragm double seat regulating valve

  • [Valve model]: ZJHN
  • [Diameter specification]: DN25～DN200mm
  • [Structure]: Double seat guide valve element
  • [Valve body material]: Cast steel (WCB), stainless steel (304, 316, 316L)
  • [Nominal pressure]: PN16、PN40、PN64
  • [Applicable temperature]: -17 ℃ - 450 ℃ (see product details for details)
  • [Application Scope]: Gas, liquid, steam, petroleum, chemical industry, power station
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  • Pneumatic diaphragm double seat regulating valve

Product features

ZJHN pneumatic diaphragm double seat regulating valve is generally used to realize pressure compensation and valve shutoff by using two sealing lines on the valve cartridge barrel to seal at the same time when pressure compensation is required. There are two seats in the body of the pneumatic diaphragm double seat regulating valve, which is one more seat than the single seat regulating valve. Because of this structure, the leakage is increased! However, its flow capacity is strong, the imbalance is small, the allowable differential pressure is large, and the flow capacity is larger than that of single seat valves of the same caliber, so it is usually especially suitable for occasions with large flow, high pressure drop, and large leakage.
Structure Diagram of Pneumatic Diaphragm Double seat Regulating Valve
Features of pneumatic diaphragm double seat regulating valve:
 
The difference between pneumatic double seat regulating valve and single seat regulating valve is that there are two valve seats in the double seat valve body and one valve seat in the single seat valve body. The double seat valve can withstand large pressure difference, but also large leakage; Single seat valve can bear small pressure difference, but the leakage is also small. Pneumatic diaphragm double seat regulating valve is widely used to accurately control the process parameters of gas, liquid, steam and other media, such as pressure, flow, temperature, and liquid level to maintain at a given value.

technical parameter

valve body
Form Through cast ball valve
Nominal diameter 20、25、32、40、50、65、80、100、125、150、200mm 
Nominal pressure PN16、40、64bar 
Flange standard JB/T79.1-94, 792-94, etc
Materials Cast steel, cast stainless steel, etc
Upper valve cover Standard type: - 17-230 ℃ Heat dissipation type: 230-450 ℃ Low temperature type: - 60-196 ℃ Bellows sealing type: - 40-350 ℃
Valve cover type Bolt compression type
Filler V-type polytetrafluoroethylene filler, asbestos filler containing impregnated polytetracyanoethylene, asbestos textile filler, graphite filler
Structural form Two seat guide type
 
Inner valve assembly
Valve core type Double seat guide valve element
Flow characteristics Equal percentage characteristic and linear characteristic
Materials Stainless steel, stainless steel stackelite alloy, titanium and corrosion-resistant platform metal, etc.  

Pneumatic diaphragm double seat regulating valve actuator:
Actuator
Type ZHA/B multi spring diaphragm actuator
Model ZHA/B-22  ZHA/B-23  ZHA/B-34  ZHA/B-45  ZHA/B-56 
Effective area cm2 350  350  560  900  1400 
Stroke mm 10、16  25  40  40、60  100 
Spring range KPa 20-100 (standard), 20-60, 60-100, 40-200, 80-240
Diaphragm material NBR rubber clip nylon cloth, EPDM rubber clip nylon cloth
Air supply pressure 140-400KPa 
Air source interface RCl/4" 
Ambient temperature -30-70℃ 
 
Valve action form
Air close type (B) - valve position open (FO) in case of air loss; Air to open (K) - valve position closed (FC) in case of loss of air
 
enclosure
Positioner, 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.