Service life of valve packing
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Release Time：2019-07-16
In the valve design or use experience, lift valve packing for asbestos packing, graphite packing, polytetrafluoroethylene packing, but these kinds of packing are limited by the number of valve opening and closing, that is, with the increase of the number of valve opening and closing, the packing will wear, the gap gradually increases, to a certain number of valves will leak from the packing. After leakage, the packing gland needs to be repressed. This scheme is suitable for the number of valve opening and closing occasions. If the valve is opened and closed frequently, this will undoubtedly increase the use and maintenance costs of the valve. When the valve is opened and closed many times, it can still be sealed: 1. add a gasket under the packing, under the gasket
In the valve design or use experience, lift valve packing for asbestos packing, graphite packing, polytetrafluoroethylene packing, but these kinds of packing are limited by the number of valve opening and closing, that is, with the increase of the number of valve opening and closing, the packing will wear, the gap gradually increases, to a certain number of valves will leak from the packing. After leakage, the packing gland needs to be repressed. This scheme is suitable for the number of valve opening and closing occasions.
If the valve is opened and closed frequently, this will undoubtedly increase the use and maintenance costs of the valve.
When the valve is opened and closed many times, it can still be sealed:
1. add a gasket under the packing, and add a spring under the gasket. When the packing is worn, due to the action of the spring, the packing will be compressed again to make it sealed.
2. selection of hydraulic and pneumatic sealing technology, change the original valve design ideas, use the cylinder seal slip ring at the packing, increase the 0-type sealing ring. This method can be used to open and close many times without leakage, but the 0-type sealing ring is easy to age, and the cost is high.
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