Nitrogen sealing valve (nitrogen supply / nitrogen release device)

Nitrogen sealing valve (nitrogen supply / nitrogen release device)
  • sell：021-32051999
  • sell：021-32050777
  • fax：021-66099555

Details

  • Product Introduction
  • Service Promise
  • Ordering Process

Nitrogen seal valve (nitrogen supply device/nitrogen release device) is a self-developed, self-powered micro-pressure control system. It is mainly used to keep the pressure of top protective gas (generally nitrogen) constant, so as to avoid direct contact between materials and air in the container, prevent material volatilization, oxidation, and the safety of the container. The product has the characteristics of energy saving, sensitive action, reliable operation, convenient operation and maintenance. It is widely used in petroleum, chemical and other industries.


The nitrogen seal valve is composed of two parts: nitrogen supply device and nitrogen release valve. The nitrogen supply device is composed of a commander and a main valve, and the nitrogen release device is composed of an internal feedback pressure-opening micro-pressure regulating valve. Nitrogen pressure is generally set to 100mmH2O. and controlled by nitrogen sealing device.


Characteristics of nitrogen sealed valves


No need for additional energy, can work in the absence of electricity, gas-free occasions, both convenient, energy-saving, cost-effective;


The nitrogen seal valve has convenient pressure setting and can be carried out under continuous production conditions.


The pressure detection diaphragm has large effective area, small spring stiffness, sensitive action and stable operation.


With no packing design, the friction force of the stem is small, the reaction is fast, and the control precision is high.


The nitrogen supply device is operated by a command device, with a decompression ratio of 100:1, good decompression effect and high control accuracy.


To ensure the safety of tanks, breathing valves should be installed at the top of the tank.


The breathing valve only plays a safety role, avoiding the defects of frequent opening and closing of the conventional nitrogen sealing device.

Nitrogen sealing valve working principle


When the inlet valve of the tank is opened and the material is added to the tank, the liquid level rises, the volume of the gas phase decreases, and the pressure rises. When the pressure in the tank rises above the set value of the pressure of the nitrogen release device, the nitrogen release device opens, releases nitrogen to the outside world, reduces the pressure in the tank and drops to the set point of the pressure of the nitrogen release device, the nitrogen release device automatically. Close.


When the outlet valve of the tank is opened and the user discharges the material, the liquid level decreases, the volume of the gas phase increases, the pressure in the tank decreases, the nitrogen supply device opens, and the nitrogen gas is injected into the tank, so that the pressure in the tank rises, and when the pressure in the tank rises to the nitrogen supply device closes automatically.

Working principle of nitrogen supply unit


The structure of the nitrogen supply device is shown in the right diagram. The medium at the pressure taking point on the top of the tank is introduced into the testing mechanism (7) through the pressure guide pipe. The medium produces a force on the testing element which is balanced with the spring (8) and the preload. When the pressure in the tank is lower than the pressure setting point of the nitrogen supply device, the balance is destroyed and the command valve core (6) is opened so that the gas in front of the valve enters the upper and lower membrane chambers of the main valve actuator (3), opens the main valve core (2) and fills the tank with nitrogen; when the pressure in the tank rises to the pressure of the nitrogen supply device, the gas in front of the valve is opened by the pressure reducing valve (5), the throttle valve (4), and enters the upper and lower membrane chambers the main valve actuator (3). At the setting point, due to the preset spring force, the command valve core (6) is closed and the main valve is closed to stop the nitrogen supply due to the spring action in the main valve actuator.

Working principle of nitrogen discharge device


As shown in the right diagram, the nitrogen release device adopts an internal feedback structure, and the medium enters the detection mechanism (2) directly through the valve cover. The medium produces a force on the detection element which balances with the preset spring (3) preload. When the pressure in the tank rises above the pressure setting point of the nitrogen releasing device, the balance is destroyed, so that the valve core (1) moves up, opens the valve, and releases nitrogen to the outside world; when the pressure in the tank drops to the pressure setting point of the nitrogen releasing device, the valve is closed due to the preset spring force.


Explain


Nitrogen seal valves generally supply nitrogen pressure between 3 * 10^5-10 * 10^5Pa.


Respiratory valve on the top of the tank only plays a safe role, is in the main valve failure, resulting in the tank pressure is too high or too low, play a safe role in normal conditions do not work


The nitrogen release valve is installed on the top of the tank, and the caliber is generally consistent with the inlet valve caliber.


The pressure setting point of general nitrogen release valve is slightly larger than that of nitrogen supply valve, so as to avoid frequent operation of nitrogen supply and discharge devices, waste of nitrogen gas and affect the service life of equipment.


If there is any difference between the user condition and the Handbook, please contact the technical development department of the plant for negotiation.


Nitrogen seal valve main parts and materials


Valve body: ZG230-450, ZG1Cr18Ni9


Valve internals: 1Cr18Ni9Ti


Membrane cover: A3 and 1Cr18Ni9Ti diaphragm: clip reinforced polyester fabric, butadiene rubber and fluorine rubber.


Springs: 60Si2Mn, 1Cr18Ni9Ti


* According to user requirements, tank nitrogen seal valve (nitrogen supply valve nitrogen relief valve) valve body, valve internals, membrane cover can be used other grades of material


Main technical parameters of nitrogen sealing valve


Nitrogen supply unit


公稱通徑DN(mm)
25
32
40
50
65
80
100
閥座直徑dn(mm)
5
6
7
8
10
12
15
20
25
32
40
50
65
80
100
額定流量系數(shù)Kv
0.2
0.32
0.5
0.8
1.8
2.8
4.4
6.9
11
20
30
48
75
120
190
額定行程L(mm)
8
10
14
20
25
流量特性
快開
壓力調(diào)節(jié)范圍(KPa)
0.4-5.5、5-10、9-14、13-19、18-24、22-28、27-33、31-38、36-44、42-51、49-58、56-66
公稱壓力PN(MPa)
1.6 2.5 4.0
被調(diào)介質(zhì)溫度(℃)
≤80
調(diào)節(jié)精度(％)
±5％
允許泄漏等級
標(biāo)準(zhǔn)級：Ⅳ級(GB/T4213-92) 嚴(yán)密型：Ⅵ級(GB/T4213-92)


Nitrogen release device


公稱通徑DN(mm)
20
25
32
40
50
65
80
100
額定流量系數(shù)Kv
6.9
11
30
30
48
75
80
190
額定行程L(mm)
8
10
14
20
25
流量特性
快開
壓力調(diào)節(jié)范圍(KPa)
0.4-5.5、5-10、9-14、13-19、18-24、22-28、27-33、31-38、36-44、42-51、49-58、56-66
公稱壓力PN(MPa)
0.1
被調(diào)介質(zhì)溫度(℃)
≤80
調(diào)節(jié)精度(％)
±5％
允許泄漏等級
標(biāo)準(zhǔn)級：Ⅳ級(GB/T4213-92) 嚴(yán)密型：Ⅵ級(GB/T4213-92)


Main dimensions of nitrogen seal valves

Instructions for ordering nitrogen sealed valves


Device name and type


Pressure setting point for supplying sputum and nitrogen discharging device


Nominal diameter DN (mm) for phlegm and nitrogen release device


Medium name


Nominal pressure PN (MPa) for sputum and nitrogen release plant


Working pressure and adjusting range


Nominal discharge coefficient Kv for phlegm and nitrogen release plant


Valve body, valve internals and filler material


Inherent flow characteristics of phlegm and nitrogen release device

The best quality, first-class service Qigao creates more value for you!

"Qigao Valve" expects to continuously improve service quality and strive for excellence. "Sincere service" is the eternal theme of "Qigao". "Qigao" strictly followsIS09001-2000 Quality system certification requirements, strict quality control, responsibility to people, to ensure the healthy operation of production, sales and service. Strengthen communication with users and provide quality products to our customers with perfection and perfect service. Hereby our factory makes the following commitments:

Product Standards：

Products in strict accordance with ChinaGB、HG Standard and USAPISuch as standard design, manufacturing, acceptance. The hardness of the sealing surface meets the requirements of the state and the width exceeds the national standard.

pre-sale service：

Product introduction, technical exchange, non-standard product design, troubleshooting。

Sale service：

A trustworthy contract guarantees timely delivery and keeps in touch with customers. For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.

After sales service：

1、"Qigao" brand product quality period is from the factory12In the month, the implementation of the "three guarantees" service (return, replacement, warranty).

2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions, so as to further improve product quality.

3、Respond quickly to the quality of user complaints, after-sales service personnel rushed to the scene in 24-36 hours (48 hours outside the province).

4、For after-sales service, users are required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of Qigao.

1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.：

a、Structure length；

b、Connection Type；

c、Nominal diameter, full diameter, reduced diameter, pipe size;

d、Operating medium and temperature, pressure range；

e、Tests, inspection standards and other requirements

2、The factory can configure various types of driving devices according to customer's specific requirements.。

3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.

4、For futures and order customers, please call us in advance to tell the required valve model, specification, quantity, delivery time and location, and timely transfer to the factory account according to the total 30% deposit or full payment. The rest of the payment is pending. Import before shipment to arrange delivery in time.

 

Order Process：

1、Customer purchase list fax to021-33872143，Or call us 021-33872141

2、Receive customer purchase list, provide valve model selection and quotation (price list)。

3、Specific agreement: delivery date, special requirements, etc.。

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1、If the customer has special requirements for the product, the following instructions must be provided in the order contract.：

a、Structure length；

b、Connection Type；

c、Nominal diameter, full diameter, reduced diameter, pipe size；

d、Operating medium and temperature, pressure range；

e、Tests, inspection standards and other requirements

2、The factory can configure various types of driving devices according to customer's specific requirements.。

3、If the type and model of the valve are determined by the customer, the customer shall correctly state the meaning and requirements of the model and sign the contract under the condition that the supplier and the buyer understand each other.

4、For futures and order customers, please call us first to tell the required valve model, specifications, quantity, delivery time and location, and press the total30%The deposit or full payment will be remitted to our factory account in time.， The rest of the payment will be remitted before shipment to arrange delivery in time.。

Sale service：

Trustworthy contract, guarantee timely delivery, keep in touch with customers at any time。

For special or duplicate products, our factory arranges technicians to use and troubleshoot the products for users.

After sales service：

1、"Qigao" product quality period is from the factory12Month, practice“Three packs”Service (return, replacement, warranty)。

2、During the use of our products, our factory regularly organizes technical and quality inspection personnel to visit and consult users for feedback on product quality, usage status and improvement opinions.，
In order to further improve product quality。

3、Respond quickly to the quality of user complaints, after-sales service personnel24-36Hours (outside the province48Hour) rushed to the scene。

4、For after-sales service, the user is required to fill out the quality feedback information form after the service and make an appraisal opinion in order to improve the service quality of “Qigao”.。

statement

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