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Self operated nitrogen seal valve

  • [valve model]: ZZDQ
  • [diameter specification]: DN20~DN100mm
  • Structural form: Through casting valve
  • [valve body material]: Cast steel (WCB), stainless steel (304, 316, 316L)
  • [nominal pressure]: PN16、PN40
  • [applicable temperature]: -20-80℃ -20-350℃
  • [application scope]: Petroleum, chemical, gas
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  •  Self operated nitrogen seal valve

Product overview

The regulating valve of self operated nitrogen sealing device is mainly composed of quick relief valve and self operated micro pressure regulating valve, as well as pressure spring, director, pulse tube and other related parts. It is mainly used to keep the pressure of protective gas (generally nitrogen) at the top of the container constant, so as to avoid direct contact between materials in the container and air, prevent volatilization and oxidation of materials, as well as the safety of the container Gas seal protection system of various large storage tanks.
 Structure diagram of self operated nitrogen sealing valve
Features of self operated nitrogen seal valve:
 
The self operated nitrogen sealing valve has the characteristics of energy saving, sensitive action, reliable operation, convenient operation and maintenance, which is widely used in petroleum and chemical industries. The self operated nitrogen sealing valve does not need external energy and can be adjusted by using the pressure of the pipeline itself. It can work in the situation of no electricity and no gas, which is convenient, energy-saving and cost-effective.

technical parameter

Technical parameters and performance
Nominal diameter Dn20、25、32、40、50、65、80、100mm     
Nominal pressure PN1.6、4.0MPa     
Flange standard JB / t79.1-94, 79.2-94, etc    
Valve body material Cast steel, stainless steel    
Valve type Single seat (P), double seat (n), sleeve (m)    
Valve core material Hard seal: stainless steel    
Soft seal: stainless steel inlaid rubber ring    
Stem material Stainless steel (1Cr18Ni9Ti, 1cr18ni12moti)    
Pressure balance Stainless steel bellows    
Flow characteristics Go ahead    
Service temperature -20-80℃ -20-350℃     

Working principle of self operated nitrogen sealing valve:  
When the pressure in the tank rises to the set pressure, the quick relief valve will open quickly to release the excess pressure in the tank. When the pressure of the micro pressure control valve in the storage tank decreases, open the valve and fill the tank with nitrogen. Because the micro pressure regulating valve must be used under the pressure of 0.1MPa and the field pressure is high, the zzyp pressure regulating valve must be installed to reduce the pressure of the pressure regulating valve to less than 0.1MPa before it can be used. The nominal pressure is 0.1MPa, the pressure can be set in sections, from 0.5kpa to below 66kpa, and the medium temperature is ≤ 80 ℃.
Structure composition of self operated nitrogen sealing valve:
Structural composition
10  11 
Main valve Main valve spool Main valve actuator Pressure reducing valve Throttle valve Director spool Testing organization Preset spring Main valve Testing organization Spring

Quotation process

Valve price:

Due to the different requirements of order quantity, packaging and delivery mode, as well as the fluctuation of valve raw material price, the valve price will be greatly different. Therefore, the price of our products is not indicated on the website. Please understand.

If you select a valve product on this website, if you need to know the price or ask for relevant technical information, please contact us. We will reply immediately, and according to your requirements, we can select the right valve products for you, so that your purchasing process is easy and pleasant.

Quotation process:

1. Please fax the name (or product model) of the valve you selected, the required order quantity, packing requirements, delivery time, your company name, location and contact information of your company to 021-36311208 Or telephone number: 021-60547555。

2. After receiving the customer's purchase list, our company will provide customers with valve quotation "price list", model selection "valve model" and technical guidance as soon as possible.

3. Specific matters to be agreed: delivery time, special requirements, etc.

Ordering instructions

1、 If the customer has special requirements for the product, the following instructions shall be provided in the order contract:
(1) Valve body material (such as: plastic, cast steel, stainless steel...)
(2) Connection type (e.g. flange, thread, clamp...)
(3) Nominal diameter, pipe size
(4) Ambient temperature and pressure range
(5) Supply voltage, air pressure
(6) Fluid properties (including nominal pressure, temperature, viscosity or acidity or alkalinity)
2、 The company configures all kinds of 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 shall correctly explain the meaning and requirements of the valve model (for details, refer to the description of valve model preparation), and sign the contract under the condition that both parties understand and agree.
4、 After the customer tells the required valve model, specification, quantity and delivery time and place, 20% of the total amount of deposit or full payment shall be timely remitted to our company's account, and the rest shall be remitted before delivery, so as to arrange delivery in time.
5、 After confirming the purchase, our company carries on the production in strict accordance with the delivery date. According to the different types and quantities of orders, the product processing cycle is generally 3 to 30 days, 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 order as early as possible.
6、 According to the needs of customers, our company provides network distribution services, delivering goods to the branches (offices) in major cities, and providing door-to-door delivery service. After the product acceptance, our company will provide after-sales service.
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