Nitrogen supply valve, nitrogen micro pressure regulating valve, pressure regulating valve

1、 Product Description:

LKZZYVP-16BNitrogen supply valve, nitrogen micro pressure regulating valveWithout the need for external energy, using the energy of the regulated medium itself as the power source, a pressure valve controller is introduced to control the position of the pressure valve core, change the flow rate of the medium passing through the valve, and maintain a constant pressure at the back end of the valve. The nominal pressure is 1.0 and 1.6 MPa; Pressure segmented adjustment from 0.5 to 1000Kpa, working temperature from 0 to 100 ℃; Flange standard according to GB9113-88, convex flange. The structural length shall comply with GB12221-89 standard.

The valve body materials include WCB, CF8, CF3M, etc., and the nominal diameter is available in various specifications ranging from DN15 to 200.

II《Product Features:

1. The pressure setting is implemented on the commander, making it convenient, fast, labor-saving, and time-saving to continuously set while in operation.

2. The control accuracy is about twice as high as that of ZZY self operated type, so it is suitable for use in situations with high control accuracy.

3. For the same valve, the adjustment range is wider than that of ZZY type self operated valve.

4. The response is particularly sensitive, and even extremely small pressures (such as 50mm water column pressure) or pressure changes can be sensed.

5. The pressure reduction ratio is relatively large, for example, 0.8MPa in front of the valve and 50mmH2O behind the valve, with a pressure difference ratio of 1600.

3、 Main component materials:

阀体： ZG230-Ni9Ti 、ZG1Cr18Ni9Ti 、ZG1Cr18Ni12Mo2Ti

阀芯： 1Cr18Ni9Ti、Cr18Ni12Mo2Ti

Diaphragm: Rubber clip reinforced polyester fabric, fluororubber diaphragm, PTFE diaphragm

4 《Selection of Flow Velocity:

If the flow rate at the valve outlet exceeds a certain value, it will cause high-frequency vibration or severe flushing, leading to damage or even destruction of the valve components and body. Although the cause of vibration and flushing is not only due to the flow rate, the flow rate factor is particularly critical.

For liquid operations, the principle of maximum flow rate is at a valve outlet of 50ft/s (12.7m/s); For gas operations, it is usually limited to below 1.0 hertz; However, for liquids with temperatures close to the saturation point, the flow rate must be reduced to 30ft/s (7.6m/s). For valves with pressure drops below the saturation vapor pressure and valves that generate cavitation, the flow rate should be limited to below 30ft/s (7.6m/s) to reduce the damage caused by cavitation. Below isLekong Instrument (Hangzhou) Co., LtdThe flow rate limit value of the regulating valve proposed based on multiple experiences.

Table 1 (Valve outlet flow velocity limit values) (unit: m/s)

55《Main Technical Parameters and Performance Indicators:

Nominal diameter DN (mm) 20 25 40 50 80 100 150

Valve seat diameter DN (mm) 6 15 20 25 32 40 50 65 80 100 125 150

Rated flow coefficient Kv 3.2 5 8 10 20 32 50 80 100 160 250 400

Pressure regulation range Kpa 0.5~70 20~120 60~400 300~700 500~1000

Nominal pressure PN (Mpa) 1.0 1.6 2.5 150Lb 300Lb

Temperature of the regulated medium (℃) 80 200

Flow characteristics: fast opening, percentage ratio, linear

Adjustment accuracy (%) ≤ 5

Allowable pressure drop (Mpa) 1.6 1.6 1.1 0.6 0.4

Effective area of actuator film (C ㎡) 200 280 400 600

Allowable leakage rate: Complies with ANSI B16.104-1976 Class VI

Connection size and standard: Flange standard: GB9113-88

Flange sealing surface type: convex surface;

Signal interface: Internal thread M16 × 1.5

The distance between the valve body flange and the flange end face can be manufactured according to the user's standards. Standards such as ANSI, JIS, JPI, etc.

The regulating spring of this valve is small, sensitive, and easy to exchange accessories. The membrane materials are diverse, including commonly used rubber materials and corrosion-resistant PTFE membranes, which can reduce friction without the need for packing sealing.

6、 Application of Nitrogen Sealing:

LKZZYVP-16BNitrogen supply valveNitrogen micro pressure regulating valveThe pressure setting is implemented on the commander, making it convenient, fast, time-saving, and labor-saving to continuously set in operation; High control accuracy, which can be twice as high as the general ZZY type direct operated self operated pressure regulating valve, suitable for occasions with high control accuracy requirements; The detection and execution components are made of high-temperature resistant materials and can be used in high-temperature (200 ℃) steam environments and nitrogen sealing systems for thermal oil tanks without the need for a condenser.

7、 Installation Plan of Nitrogen Supply Valve:

8、 In the case of corrosion of materials, anti-corrosion measures need to be taken

When the medium is a corrosive chemical substance such as strong acid or strong alkali, such as sulfuric acid, hydrochloric acid, silicon trichloride, nitric acid, etc., the fully lined fluoroplastic F46 can effectively prevent the corrosive medium from corroding the valve and provide tight shut-off and excellent control capabilities. In case of high temperature conditions, the lined plastic PFA can meet the high temperature requirements.

9、 Working principle of nitrogen sealing device:

When the feed valve of the storage tank is opened and materials are added to the tank, the liquid level rises, the volume of the gas phase decreases, and the pressure increases. When the pressure inside the tank rises above the set pressure of the nitrogen release valve, the nitrogen release valve opens and releases nitrogen gas to the outside, causing the pressure inside the tank to decrease. When the pressure drops to the set point of the nitrogen release valve, the nitrogen release valve automatically closes.

When the discharge valve of the storage tank is opened to start discharging, the liquid level in the tank decreases, the volume of the gas phase increases, the pressure in the tank decreases, and the nitrogen supply valve opens to inject nitrogen into the storage tank, causing the pressure in the tank to rise. When the pressure in the tank rises to the point where the nitrogen supply valve automatically closes.

The fire-resistant breathing valve is only used for secondary protection. When the nitrogen supply and discharge valves fail, the breathing valve opens to protect the safety of the tank.

The common pressure settings for nitrogen sealing systems are: 1 kPa for nitrogen supply valve, 2 kPa for nitrogen release valve, and positive pressure+3 KPa/negative pressure 1-95 Pa for breathing valve. The three valves form a certain pressure difference and work together.

10、 Fault analysis and solutions:

Fault phenomenon: The outlet pressure is lower than the set pressure

Cause of failure:

1. Inappropriate supply pressure

2. Filter blockage

3. There is dirt on the surface of the pilot valve

4. The selection is too small

5. Incorrect adjustment

6. The pressure gauge is damaged

resolvent:

1. Adjust import pressure

2. Clean the filter

3. Disassemble the valve body and clean the pilot valve

4. Re select the correct model

5. Loosen the adjusting bolt and readjust the pressure

6. Replace the pressure gauge

Fault phenomenon: The outlet pressure is greater than the set pressure

Cause of failure:

1. Damaged sealing ring

2. Damaged membrane

3. Feedback tube blockage

Solution:

1. Clean the main components after disassembly

2. Replace the sealing ring

3. Replace the membrane

4. Clean feedback pipe

Fault phenomenon: Abnormal noise emitted by the valve

Cause of failure:

1. The selection is too large

2. Excessive pressure reduction ratio

3. The shut-off valve behind the valve is too close to the pressure reducing valve

resolvent:

1. Re select the correct model

2. Choose a suitable pressure reducing valve or perform secondary pressure reduction

Lekong Instrument (Hangzhou) Co., LtdLocated by the picturesque Fuchun River in Hangzhou, it is an enterprise that integrates engineering and valve production, providing customers with professional solutions for process automation and control equipment. The industries involved include chemical, petrochemical, power, environmental, biotechnology, pharmaceuticals, food, non-ferrous metals, steel, and other industrial sectors.