Nkj41h Flanged Vacuum Isolation Globe Valve

• Media: Aqueous Vapor Liquid
• Temperature: Ordinary Temperature
• Actuator: Manual Pneumatic Electric
• Material: Stainless Steel Carbon Steel
• Structure: Through Way Globe Valve
• Sealing Form: Hard Seal and Soft Seal
• Model NO.: NKJ41H
• Stem Thread Position: Outside Screw Stem Globe Valve
• Application: Lining Fluorine Valve, Needle Type Globe Valve, Cryogenic Globe Valve, Plunger Type Globe Valve, Heat Preservation Globe Valve, Forged Steel Globe Valve, Oxygen Globe Valve, Bellows Globe Valve
• Standard: DIN, GB, ANSI, BSW, JIS
• Stress: Meso-High
• Transport Package: Wooden Box
• Specification: DN15-DN800
• Trademark: XC
• Origin: China
• HS Code: 8481804090
• Production Capacity: 10000

Product Description

effect

1. Switch the gas path, when valve 1 and valve 4 are closed, valve 2 is opened, the mechanical vacuum pump vacuums the container I, and the air flows through the pre-vacuum suction pipe; When valve 2 is closed and valve 4 is opened, the mechanical pump can vacuum the diffusion pump separately; When valve 1 and valve 4 are opened at the same time, the diffusion pump and the mechanical pump can work at the same time to evacuate the container, and the air flow through the diffusion pump at this time. It can be seen that the role of the valve in this operation is to switch the gas path and change the flow of air through the route.
2. Control the size of the air flow, adjust the vacuum degree in Figure 1, adjust the valve cover opening Angle of valve 1, you can adjust the size of the gas flow through the pipeline; Close the valve 2 and valve 4, through the exhaust valve 3 can give the inlet of the mechanical pump into the atmosphere; The vacuum degree in the container can be adjusted through the vent valve 5.
3. Quantitative inflation, there is a certain volume of small hole on the plunger of the glass valve, when the small hole turns to the right and the high-pressure cylinder is connected, the small hole can be filled with high-pressure gas; When it turns to the left and the vacuum container is connected, the volume of high pressure gas is put into the container, so that it plays the role of quantitative inflation.

Parameter definition

1. nominal diameter: (nominal diameter), also known as mean outside diameter, indicating the symbol DN, is the common caliber of all kinds of pipes and pipe accessories. The same nominal diameter of the pipe and pipe accessories can be connected to each other, with interchangeability. It is not the actual outer diameter or inner diameter of the pipe, although its value is closer to or equal to the inner diameter of the pipe, in order to unify the connection size of the pipe and pipe fittings, the nominal diameter (also known as the nominal diameter, nominal diameter) is used. For example, welded steel pipe can be divided into thin-wall steel pipe, ordinary steel pipe and thickened steel pipe according to the thickness. Its nominal diameter is not the outer diameter, nor the inner diameter, but a nominal size similar to the inner diameter of the ordinary steel pipe. Each nominal diameter corresponds to an outside diameter, and the value of its inside diameter varies with the thickness. Nominal diameters can be expressed in metric mm or in imperial in. Pipe accessories are also expressed in nominal diameter, meaning the same as the sewn pipe.
2. Nominal pressure: (Nominal pressure), indicating symbol PN, the maximum allowable working pressure under a certain temperature application. For the control valve of carbon steel body, it refers to the maximum allowable working pressure when the application is below 200ºC; For cast iron valve body, refers to the maximum allowable working pressure when applied below 120ºC; For the control valve of the stainless steel body, it refers to the maximum working pressure allowed when the application is below 250 ° C. When the operating temperature rises, the pressure resistance of the valve body will be reduced. For example, a carbon steel control valve with a nominal pressure of 6.4MPa (PN64) has a pressure resistance of 5.2MPa at 300 ° C, 4.1MPa at 400 ° C, and 2.9MPa at 450 ° C. Therefore, the determination of the nominal pressure of the control valve should not only be based on the highest working pressure, but also on the highest working temperature and material characteristics, rather than just meeting the nominal pressure greater than the working pressure.

Structural characteristics

1. The product is designed and manufactured according to JB/T3595 standard to meet the requirements of power station equipment supporting use.
2. The vacuum sealing structure packing room is designed to isolate the vacuum reliably.
3. The valve stem has good corrosion resistance, abrasion resistance and wear resistance after tempering and surface nitriding treatment.
4. The flange gasket is made of composite material, with large expansion coefficient and good airtight performance to ensure reliable isolation between the system and the atmosphere.
5. The reverse seal is made of stainless steel thread connection sealing seat or body surfacing austenitic stainless steel, and the reverse seal is reliable. Packing replacement and maintenance can be carried out without shutdown, convenient and quick without affecting the system operation.