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Conversion of valve nominal diameter and inch | comparison table
Valve nominal diameter|valve nominal diameter Definition of valve nominal diameter: Nominal diameter (or nominal diameter), also known as average outer diameter, refers to the size of all piping accessories in the piping system. The nominal diameter is a convenient round integer for reference. The nominal diameter of the valve is marked with a number followed […]
Comparison table of valve diameter (DN) and pipe diameter
The size of the valve caliber has an inevitable relationship with the size of the pipeline. It is usually said that the pipe diameter (outer diameter) is matched with the valve. The valve diameter needs to be calculated according to the actual parameters. Generally speaking, the pipeline will be larger, and the valve actually needs […]
Working principle diagram of swing check valve
Working principle diagram of swing check valve Swing check valve, also known as check (flow) valve, is an automatic valve used on one-way flow pipelines to prevent the medium from flowing back. It depends on the pressure of the pipeline medium to open or close the valve. It can be divided into single valve type […]
Working principle diagram of lift check valve
Lifting check valve structure: Lifting check valve is a kind of valve that prevents pipeline media from flowing back, mainly composed of valve body, valve seat, valve flap, valve cover and other related parts. The lift check valve is equipped with a spring to ensure that the disc is always in a dynamic equilibrium state […]
What is butt welding? (9)- New technology of flash butt welding
New technology of flash butt welding 1) Program-controlled reduced-voltage flash butt welding is characterized by the use of higher secondary no-load voltage at the beginning of the flash to facilitate the initiation of the flash. When the end surface temperature rises, the low-voltage flash is used and maintained The flash speed remains unchanged to improve […]
What is butt welding? (8)- typical workpieces
Butt welding of typical workpieces 1, butt welding of small section workpieces wire with diameter d≤5mm is mostly used for resistance butt welding, Small diameter wires, wires of different materials, and wires and stamping parts (such as resistors and diode end caps) can be welded by capacitive energy storage type, which is characterized by very […]
What is butt welding? (7)- Flash butt welding of common metals
The following describes the characteristics of flash butt welding of several commonly used metal materials: 1. Flash butt welding of carbon steel This kind of material has the advantages of high resistivity, the oxidation of carbon element during heating provides a protective atmosphere for the interface CO and CO2, and does not contain elements that […]
What is butt welding? (6)- Flash butt welding of common metals
Flash butt welding of common metals Almost all steel and non-ferrous metals can be flash butt welded, but to obtain high-quality joints, it is necessary to take necessary process measures according to the relevant characteristics of the metal. The analysis is as follows: (1) Electrical and thermal conductivity For metals with good electrical and thermal […]
What is butt welding? (5)- flash butt welding
(4) Flash speed vf A sufficiently large flash speed can ensure the strong and stable flash. However, if vf is too large, the heating zone will be too narrow, which will increase the difficulty of plastic deformation. At the same time, due to the increase in welding current required, it will increase the depth of […]
What is butt welding? (4)- flash butt welding
2. Resistance and heating of flash butt welding The contact resistance Rc during flash butt welding is the total resistance of the liquid metal lintel between the end faces of the two workpieces, and its size depends on the number of lintels and their cross-sectional area at the same time. The latter two are related […]