Pneumatic diaphragm cryogenic control 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 cryogenic control valve

  • [Valve model]: DWZJHP
  • [Diameter specification]: DN20～DN250mm
  • [Structure]: Single seat, sleeve type
  • [Valve body material]: Cast steel (WCB), stainless steel (304, 316, 316L)
  • [Nominal pressure]: PN16、PN40、PN64
  • [Applicable temperature]: -40~- 196 ℃, ultra-low temperature up to - 250 ℃
  • [Application Scope]: Low temperature gas and fluid (such as liquid oxygen, liquid argon, etc.)
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  • Pneumatic diaphragm cryogenic control valve

Product features

The pneumatic diaphragm cryogenic control valve is suitable for low temperature and cryogenic occasions where the medium temperature is - 40 ℃~- 196 ℃ (such as liquid oxygen, liquid nitrogen, etc.). It is mainly composed of a multi spring pneumatic diaphragm actuator and a valve body with a long neck connection pipe. The function of a long neck upper bonnet is used to make the packing work at normal temperature and reduce the transmission of external heat energy. In order to reduce transmission, the long neck generally adopts a thin-walled structure, It has good low temperature resistance, and is especially used to accurately control the process parameters of cryogenic gas and fluid (such as liquid oxygen, liquid argon, etc.) to keep at the given value.
Structure Diagram of Pneumatic Low Temperature Control Valve
Features of pneumatic cryogenic control valve:
 
The pneumatic low temperature control valve is widely used in metallurgy, air separation, oxygen production, petroleum, chemical and other low temperature and cryogenic occasions due to its relatively harsh working conditions, strict quality control on the processing of parts, and special low temperature treatment to ensure that the valve will not be brittle under low temperature working conditions, and can withstand the impact of low temperature media.

technical parameter

valve body
Form Through cast ball valve
Nominal diameter 20、25、32、40、50、65、80、100、125、150、200、250mm 
Nominal pressure PN16、40、64bar 
Flange standard JB/T79.1-94, 792-94, etc
Materials Cast steel, stainless steel, etc
Upper valve cover Low temperature type: - 60 -- 196 ℃ Ultra low temperature type: - 250 ℃
Valve cover type Bolt compression type
Filler V-shaped PTFE packing, V-shaped flexible graphite packing
Structural form Extension rod
 
Inner valve assembly
Valve core type Single seat, sleeve type
Flow characteristics Equal percentage characteristic and linear characteristic
Materials Stainless steel, stainless steel stackelite alloy, titanium and corrosion-resistant platform metal, etc.  

Pneumatic low-temperature control 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.