What are the respective principles of threaded connection and flange connection for solenoid valves? What's the difference?
You should be talking about a KF flange and a CF flange, right?
The ICF flange (ConFlat Flange) has a raised sharp edge on the inside, which can achieve the purpose of sealing the vacuum by squeezing the copper gasket to deform it. It is an all-metal sealing component. It is widely used in equipment in the ultra-high vacuum field.
ICF (ConFlat Flange) vacuum flange specifications and materials
ICF flange is divided into fixed type, rotating type, screw hole type and screw type, totaling 4 kind. The fixed flange is completely integrated. The rotary flange consists of connecting pipes, extruded copper gasket parts and fixed parts with screws. The screw hole type needs to be fixed by screws and nuts, and the flange only needs holes for screws to pass through. Screw-type flanges do not require nuts. Screws are cut on the flange and fixed directly. The material of the flange is mainly SUS304. SUS304 releases less gas and is easy to process and weld.
Also called flange or flange.
Parts that connect pipes to each other. Connect to the pipe end. There are holes on the flange, and bolts can be inserted to tightly connect the two flanges. The flanges are sealed with gaskets. Flanged pipe fittings refer to pipe fittings with flanges (flanges or plates). It can be made of casting (picture is missing), or it can be made of threaded connection or welding. Flange connection (flange, joint) consists of a pair of flanges, a gasket and several bolts and nuts. The gasket is placed between the sealing surfaces of the two flanges. After the nut is tightened, the specific pressure on the surface of the gasket reaches a certain value and then deforms, filling the uneven spots on the sealing surface to make the connection tight and leak-proof. Flange connection is a detachable connection. According to the connected parts, it can be divided into container flange and pipe flange. According to the structural type, there are integral flanges, loop flanges and threaded flanges. Common integral flanges include flat welding flanges and butt welding flanges. The flat welding flange has poor rigidity and is suitable for occasions with pressure p ≤ 4MPa; the butt welding flange, also known as high-neck flange, has greater rigidity and is suitable for occasions with higher pressure and temperature. There are three types of flange sealing surfaces: flat sealing surface, suitable for situations where the pressure is not high and the medium is non-toxic; concave and convex sealing surfaces, suitable for situations where the pressure is slightly higher; tongue-and-groove sealing surfaces, suitable for flammable and explosive situations , toxic media and high pressure situations. A gasket is a ring made of material that can produce plastic deformation and has a certain strength. Most gaskets are cut from non-metallic plates or made by professional factories to specified sizes. The materials are asbestos rubber plates, asbestos plates, polyethylene plates, etc.; thin metal plates (tinplate, stainless steel) are also used to seal asbestos. A metal-clad gasket made of wrapping non-metallic materials; there is also a wound gasket made of thin steel strips and asbestos strips. Ordinary rubber gaskets are suitable for occasions where the temperature is lower than 120°C; asbestos rubber gaskets are suitable for situations where the water vapor temperature is lower than 450°C, the oil temperature is lower than 350°C, and the pressure is lower than 5MPa. For general corrosiveness Medium, the most commonly used is acid-resistant asbestos board. In high-pressure equipment and pipelines, lens-shaped or other-shaped metal gaskets made of copper, aluminum, No. 10 steel, and stainless steel are used. The contact width between the high-pressure gasket and the sealing surface is very narrow (line contact), and the processing smoothness of the sealing surface and gasket is high.
Flanges are divided into threaded connection (wire connection) flanges and welding flanges. Low-pressure small-diameter wired flanges, high-pressure and low-pressure large-diameter welded flanges are used. The thickness of the flange plate and the diameter and number of connecting bolts are different for different pressures.
According to different levels of pressure, flange pads are also made of different materials, ranging from low-pressure asbestos pads, high-pressure asbestos pads to metal pads.
1. Classify by material: carbon steel, cast steel, alloy steel, stainless steel, copper, aluminum alloy, plastic, argon alloy, ppc, etc.
2. According to the production method, it can be divided into pushing, pressing, forging, casting, etc.
3. According to manufacturing standards, it can be divided into national standard, electric standard, water standard, American standard, German standard, Japanese standard, Russian standard, etc.
Types of flange connections
Plate flat welding flange
Neck flat welding flange
Neck butt welding flange< /p>
Socket welding flange
Threaded flange
Flange cover
Neck butt welding ring loose flange
Flat welding ring loose sleeve flange
Ring groove flange and flange cover
Large diameter flat flange
Large diameter high neck Flange
Eight-shaped blind plate
Butt welding ring loose flange
Flange connection
Flange connection is First, fix two pipes, pipe fittings or equipment on a flange plate respectively, add flange pads between the two flange plates, and fasten them together with bolts to complete the connection. Some pipe fittings and equipment already come with flanges, which are also flange connections. Flange connection is an important connection method in pipeline construction.
The flange connection is easy to use and can withstand greater pressure. In industrial pipelines, flange connections are widely used. Inside the home, pipes are small in diameter and low pressure, with no visible flange connections.
If you are in a boiler room or production site, there are flange-connected pipes and equipment everywhere.
Flange production standards:
National standard: GB/T9112-2000 (GB9113·1-2000～GB9123?4-2000) American standard: ANSI B16.5 Class150, 300, 600, 900, 1500 (WN, SO, BL, TH, LJ, SW) Japanese standard: JIS 5K, 10K, 16K, 20K (PL, SO, BL, WN, TH, SW) German standard: DIN2573, 2572, 2631 , 2576, 2632, 2633, 2543, 2634, 2545 (PL, SO, WN, BL, TH) Chemical Industry Standards: HG5010-52～HG5028-58, HGJ44-91～HGJ65-91, HG20592-97 series, HG20615- 97 series mechanical standards: JB81-59～JB86-59, JB/T79-94～JB/T86-94, JB/T74-1994 pressure vessel standards: JB1157-82～JB1160-82, JB4700-2000～JB4707-2000