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Vacuum valve is a valve whose working pressure is lower than standard atmospheric pressure. Vacuum valves can be divided into vacuum shutoff valves, vacuum diaphragm valves, vacuum solenoid valves, vacuum safety valves, vacuum baffle valves, vacuum plug valves, vacuum inflation valves, etc. The common connection modes of vacuum valves are looper flange connection, threaded connection and quick-release flange connection.
1. Loop flange connection is the most commonly used form of connection in valves. According to the shape of the joint surface, it can be divided into the following categories:
Smooth type: For valves with low pressure, easy to process.
Concave and convex type: high working pressure, can use medium hard washer.
Tenon-groove type: gaskets with large plastic deformation can be used, which are widely used in corrosive media and have good sealing effect.
Trapezoidal groove type: Use elliptical metal ring as gasket for valves with working pressure greater than 64 kg/square centimeter or high temperature valves.
Lens: Washers are lens shaped and made of metal. High-pressure valves or high-temperature valves with working pressure greater than 100 kg/m2.
O-ring type: This is a relatively new form of flange connection. It is developed with the emergence of various rubber O-rings. Its sealing effect is more reliable than that of ordinary flat gaskets.
2. Thread connection is a simple connection method, often used in small valves. There are two situations:
Direct Sealing: Internal and external threads play a direct role in sealing. In order to ensure that the joint is not leaking, it is often filled with lead oil, linen and raw PTFE tape; among them, raw PTFE tape is widely used; this material has good corrosion resistance, excellent sealing effect, convenient use and storage, and can be removed completely when disassembled, because it is a layer of non-sticky film. It is much superior to lead oil and linen.
Indirect Sealing: The force of screw tightening is transmitted to the gasket between two planes to make the gasket act as a seal.
3. Fast-release flange connection uses clamp to clamp O-ring and body flange to achieve better sealing.