What are the flange sealing forms for melt pumps?

Flanges are the most common type of component structure in the connection of piping and equipment, and are widely used in many industries due to their convenient operation and reliable performance. In the high temperature melt chemical and extrusion industries, the connection of each equipment and transfer pipeline is also mainly accomplished by flanges.

polymer melt pump

According to different shape structure, sealing surface form and connection welding port style, flange has a variety of classifications, but the main structure is basically: two corresponding flange, flange sealing gasket between the flange, and through the distribution of bolts around the melt gear pumps are mostly used for high temperature and high pressure conditions, usually the transport medium also has a certain degree of corrosiveness, the continuous process of chemical industry and extrusion production is very much focused on the reliability of the equipment, in order to better meet the needs of the working conditions, melt gear pumps are widely used in many industries, because of their convenient operation, reliable performance and high reliability. In order to better meet the needs of the working conditions, melt gear pumps commonly used flange sealing forms are: stop seal, metal ring seal, winding gasket seal, tooth combination gasket seal.

melt pump in extruder

First, stop seal

Stop seal is a kind of cancel gasket sealing style, the structure is: one end of the flange open countersunk hole concave platform, the other end of the flange open and countersunk hole concave platform corresponds to the ring cam, the use of the top surface of the cam and the concave platform to complete the sealing of the bottom surface of the cam and the locking sticking. This kind of sealing is mainly used in high viscosity extrusion industry, in order to take into account the role of sealing and relative positioning of the two sides of the flange, eliminating the need to replace the flange gasket every time the disassembly of the trouble. When installing the sealing surface can be properly coated with sealant to enhance the sealing, special attention should be paid to the installation stage to protect the sealing surface from damage.

plastic extruder melt pump

Second. Metal ring seal

Metal ring seal is similar to stop seal, in the structure, the stop sealing sealing cam and flange separation, flange recess into the relatively softer texture, height above the depth of the recess of copper or stainless steel metal ring, usually also in the metal ring on both sides of the sealing surface to open up a number of sealing water line to enhance the sealing effect. Metal ring can be reused many times to improve the texture of the stop seal cam and damage is not easy to repair the shortcomings.

pump melt gear pump for plastic extruder

Third, winding gasket seal

Winding gasket by the "V" or "W" shaped metal belt and non-metallic materials wound into a circular sealing ring, is a semi-metallic gasket in the resilience ** gasket, suitable for uneven loads, easy to relax the joint force, temperature and pressure cyclical changes, there are shocks or vibration of the platform, but also according to the corrosive properties of the material can be selected from different metal to meet the demand.

melt gear pump

Four, tooth-shaped combination gasket sealing

Toothed gasket is a kind of metal soft gasket, the sealing effect is better than the metal flat gasket, generally with precision lathe in the metal stainless steel flat gasket two sides processed into concentric 90-degree angle waveform serrated grooves, according to different media, you can choose the flexible graphite, PTFE, non-asbestos sheet or some other soft metal paste in the gasket on the two sides, to take full advantage of the sealing of the soft cover layer as well as the strength of the metal, elasticity and good, and also has a mnemonic sealing effect, and also has a good sealing effect. Also have the sealing effect, compared to achieve the same sealing effect of the gasket compression force is small.