The materials such as asbestos packing or graphite packing used in the design of the steel ball valve are subject to different degrees of wear due to the number of times the valve is opened and closed, and the ball valve products with frequent opening and closing times invisibly increase the use and maintenance costs.
Add a washer under the packing and a spring under the washer. When the packing wears, the packing will be re-pressed and sealed by the action of the spring. At present, this method can only achieve 50-100 million opening and closing without leakage, and requires the user to re-press the packing gland during the annual overhaul, which can only reduce the usual maintenance. Another method is to use hydraulic and pneumatic sealing technology to change the original design concept of steel core ball valve. Use the cylinder sealing slip ring at the packing to increase the 0 type sealing ring. This method can achieve 2 million times of opening and closing without leakage, but the 0-type sealing ring should be aging, the use time is only 5 years, and the cost is high.
The emergence of problems can always inspire the development and understanding of designers and users' creative thinking. Under the background of continuous improvement of technology level, various problems in the use of steel core ball valves can always seek new breakthroughs in repeated practice.
12Mm Laminate Flooring,Mdf Laminate Flooring,Engineered Wood Flooring,Engineered Hardwood Flooring
Jinan Caiming Wood Co.,LTD , http://www.caimingflooring.com