When purchasing seals, we must first understand the performance and characteristics of the seals, and then understand the operating structure of the mechanical equipment, which is the specific situation of static seals or transportation seals. Next, let the Delong product experts introduce the performance and characteristics of hydraulic and pneumatic seals
First, the main characteristics of hydraulic and pneumatic O-ring:
The O-ring is a rubber ring with a round cross-section. The sealing material is mainly made of nitrile butadiene rubber (NBR) and fluorine rubber (FKM). O-ring seals are the most common seal rings used in hydraulic and pneumatic transmission systems. It is mainly used for dynamic sealing (repeated motion) and static sealing.
The hydraulic and pneumatic O-ring dynamic seal (repeated movement) is used at a rate of 0.005-0.3m/s.
When rotating motion seals, only low-speed rotating seals are allowed. For example, the valve sealing mechanism of the central rotary joint of a hydraulic excavator. In general, O-rings are rarely used in rotary motion sealing equipment.
2. The comparison of sealing methods such as hydraulic and pneumatic O-ring has the following advantages:
1, compact structure, convenient installation and disassembly.
2, static/dynamic seal can be used.
3, the dynamic friction resistance is small.
4, the use of a single O-shaped seal, can play a sealing role in two directions.
5. Low price.
However, when the equipment is started again outside the idle time, the friction resistance of the O-ring will increase due to its adhesion to the coupling surface of the sealing equipment, and creep will occur.
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