How to reasonably select and use sealing gasket media , temperature, pressure and working conditions should be important factors. For example, when the working pressure is not high, plastic flange docking (PN) is used. For another example, in a working environment with chemical media, different sealing media must be reasonably matched to achieve good results, otherwise unpredictable chemical changes are prone to occur. Therefore, any paradox in the selection of seals will lead to unimaginable consequences.
Generally, the gasket structures have the following types for reference:
1. For flange connection a, flat gasket: multi-purpose medium pressure asbestos, oil-resistant asbestos, polytetrafluoroethylene, graphite gasket or reinforced graphite gasket, non-asbestos gasket, metal flat gasket, special metal gasket wait
b. Spiral gasket: with outer ring or with inner and outer rings (most commonly used for flat flanges); ring type with inner ring (commonly used for concave and convex flanges); basic type (without inner and outer rings), special for grooved flanges, sealing surface Narrow, flat-welded full-face flange sealing surface is wider, equivalent to a spiral wound gasket with an inner ring and an outer ring. It is necessary to pay attention to which country and standard the flange is.
2. Rotating and pulling shaft seals use a variety of fillers. Such as flexible graphite rings (open and non-open), braided packing (or packing rings) of various materials, internal and external skeleton oil seal YX rings, O-rings, etc. of various materials.
3. Special parts sealing products. Common sealing strips, PTFE ball valve seats, graphite packing rings and rubber butterfly valve rings, etc.
What should you pay attention to when installing seals?
1. Do not damage the sealing surface or sealing line of the seal. The sealing performance of the flat seal depends on the upper and lower end faces; the sealing performance of the hydraulic seal depends on the lip line related to the hole or shaft. The portions are tender and rich. Graphite, rubber, fiber, etc. that are elastic, temperature-resistant, corrosion-resistant, and aging-resistant are all special materials that are easily damaged. Therefore, special protection and care are required during handling, installation and storage. Once damaged, they tend to be damaged. Leaves many hidden dangers to the sealing parts;
2. Do not force installation Some seals are placed in grooved stuffing boxes and need to be installed tightly. Do not be rough or brutal during the construction process. Forced loading with large movements will inevitably destroy the original prefabricated structure of the seal. Filling out the required sections is a sure recipe for disaster. The installation of such seals must be very careful and careful, and the embedding must be done step by step;
3. Pay attention to balance and symmetry during installation and place the seal close to the effective sealing surface (or lip line). After the system is turned on and used, the seals must be further observed and tightened to prevent malfunctions caused by micro-leakage due to changes in operating conditions (such as boosting) during system operation.
How to properly store seals that are not in use temporarily?
1. Anti-aging, light-proof, moisture-proof, placed flat, away from cold and heat sources
2. No pressure is applied to keep the seal in a naturally relaxed state, and no external force is applied to change its physical shape
3. Classification and marking of the same appearance, different materials, parts used, applicable standards, purchase date, etc.
For more information, please pay attention to Runfengda Equipment www.rfdphe.com
