What are the functions of high pressure flanges?

    High-pressure flanges are an indispensable connector, a widely used component in pressure vessels and pressure pipes, and a wide variety of components. However, it cannot be said that the thicker the gasket, the better the sealing. This is because the thickness of the gasket is different and the conditions for establishing the initial seal are also different. When the large flange is welded, the forging pressure is too small, the deformation is insufficient, and the joint strength is decreased. If the top forging pressure is too large, the deformation amount is too large, the crystal grain is severely bent, and the joint impact toughness is lowered.    However, socket welding is not capable of radiographic inspection, and magnetic powder or penetration testing can be used for flaw detection. The bottom of the exhaust valve of the safety valve should have a drain pipe that is connected to a safe place. No valves are allowed on the exhaust pipe and the drain pipe. When fully open or fully closed, the sealing surface of the ball and the valve seat is isolated from the medium, and the medium does not cause erosion of the sealing surface of the valve.

    What are the performance factors that affect large flanges?

    In the production of large flanges, there are many factors affecting the performance of large flanges, first the annealing temperature (annealing temperature is the temperature parameter when the primer and template are combined, when 50% of the primers and complementary sequences are expressed as double-stranded DNA molecules) It is an important factor affecting the specificity of PCR. 

    Under ideal conditions, the annealing temperature is low enough to ensure that the primers are effectively annealed to the target sequence, while being high enough to reduce non-specific binding. Reasonable annealing temperature from 55 ° C To 70 ° C. The annealing temperature is generally set 5 ° C lower than the Tm of the primer, and whether the specified temperature is reached. Large-scale flange treatment is generally carried out by solid solution heat treatment, which is commonly called "annealing", and the temperature range is 1040~1120 °C (Japanese standard). You can also observe through the observation hole of the annealing furnace. The large flange fittings in the annealing zone should be in an incandescent state, but there is no softening and sagging.

    Followed by the sealing of the furnace body (the outer shell is welded with steel plate and section steel, the trolley is welded by steel and steel plate, the trolley passes the soft contact with the furnace lining and the sand sealing mechanism to reduce heat radiation and convection loss, and effectively ensure the sealing of the furnace body. ), the bright annealing furnace should be closed and isolated from the outside air; using hydrogen as the shielding gas, only one exhaust port is open (used to ignite the discharged hydrogen). The method of inspection can be applied to the gaps of the joints of the annealing furnace with soapy water to see if the gas is running. The most easy place to run the gas is the place where the annealing furnace enters the pipe and the place where the pipe is discharged. The sealing ring in this place is particularly prone to wear. Always check frequently to change.

    In addition, the protective gas pressure, in order to prevent the occurrence of micro-leakage, the furnace protective gas should maintain a certain positive pressure, if it is hydrogen protective gas, generally requires more than 20kBar. Annealing atmosphere: Generally, pure hydrogen is used as the annealing atmosphere, and the purity of the atmosphere is 99.99% or more. If another part of the atmosphere is an inert gas, the purity can be lower, but it cannot contain too much oxygen or water vapor.