Vacuum valves are an effective component for controlling air flow. What are the connection types? Let’s take a look at it with the editor of Wholesale Roots vacuum pump equipment!
1. Looper flange connection. This is the more commonly used connection form in valves. According to the shape of the joint surface, it can be divided into the following types:
1. Smooth type: used for valves with low pressure. Processing is more convenient.
2. Concave-convex type: high working pressure, medium hard washer can be used.
3. Tongue and groove type: gaskets with greater plastic deformation can be used, which are widely used in corrosive media and have a better sealing effect.
4. Trapezoidal groove type: oval metal ring is used as a gasket, used for valves with working pressure ≥64 kg/cm² or high temperature valves.
5. Lens type: The washer is a lens shape and is made of metal. Used for high-pressure valves or high-temperature valves with working pressure ≥100 kg/cm².
6. O-ring type: This is a relatively new form of flange connection. It is developed with the appearance of various rubber O-rings. It is more reliable than ordinary flat gaskets in terms of sealing effect.

2. Threaded connection. This is a simple connection method, often used for small valves. There are two situations:
1. Direct sealing: the internal and external threads directly play a sealing role. In order to ensure that the joints are not leaking, they are often filled with lead oil, hemp and PTFE tape; among them, PTFE tape is widely used every day; this material has good corrosion resistance and good sealing effect. Well, it is convenient to use and store. When disassembling, it can be completely removed, because it is a non-sticky film, which is much better than lead oil and hemp.
2. Indirect sealing: The tightening force of the thread is transmitted to the gasket between the two planes, so that the gasket plays a sealing role.
The above is the editor of Wholesale Roots vacuum pump equipment introducing the related knowledge of the connection form of Vacuum valves. I hope you will learn more through the above introduction.