Self operated nitrogen sealing valve - Shanghai Dongfeng Pump Valve Factory - 上海花千坊_上海龙凤花坛_夜上海最新论坛

Self operated nitrogen sealing valve

  • [Valve model]: ZZDQ
  • [Diameter specification]: DN20～DN100mm
  • [Structure]: Through cast 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 sealing valve

Product features

The regulating valve of self operated nitrogen sealing device is mainly composed of quick release valve, self operated micro pressure regulating valve, pressure spring, director, pulse tube and other related parts, which is mainly used to keep the pressure of the protective gas (generally nitrogen) at the top of the container constant, so as to avoid direct contact between the materials in the container and the air, prevent the volatilization and oxidation of materials, and ensure the safety of the container, It is especially suitable for the gas seal protection system of various large storage tanks.
Structure diagram of self operated nitrogen sealing valve
Features of self operated nitrogen sealing valve:
 
Self operated nitrogen sealing valve has the characteristics of energy saving, sensitive action, reliable operation, convenient operation and maintenance, and is widely used in petroleum, chemical and other industries. The self operated nitrogen sealing valve does not need external energy, and can be adjusted by using the pipeline's own pressure. It can work in the situation without electricity and gas, which is convenient, energy saving and cost reducing.

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    
Service temperature -20-80℃ -20-350℃     

Operating principle of self operated nitrogen sealing valve:  
When the pressure in the tank rises to the set pressure, the quick release valve quickly opens to release the excess pressure in the tank. When the pressure of the micro pressure control valve in the tank decreases, open the valve and fill the tank with nitrogen. Since the micro pressure regulating valve must be used at a pressure below 0.1Mpa, and the site pressure is high, ZZYP type pressure regulating valve must be installed to reduce the pressure of the pressure regulating valve to below 0.1Mpa before use. The nominal pressure is 0.1Mpa, and the pressure can be set in sections, from 0.5Kpa to below 66Kpa, and the medium temperature is ≤ 80 ℃.
Structure and composition of self operated nitrogen sealing valve:
Structure composition
1  2  3  4  5  6  7  8  9  10  11 
Main valve Main valve element Main valve actuator Pressure reducing valve Throttle valve Pilot valve element Inspection organization Preset spring Main valve Inspection organization Spring

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.