O Ring is a circular rubber ring with a circular cross-section, which is widely used in hydraulic and pneumatic transmission systems. It is mainly used for mechanical parts to stop leakage of liquid and gas under static conditions from happening. In some cases, O Ring can be used as dynamic sealing elements of axial reciprocating motion and low-speed rotating motion. According to different situations, different materials can be selected to adapt to it.
This article will walk you through the application scope, working principle, features, and selection of O Ring.
Application of O Ring
Various mechanical equipment can install rubber O Ring. It acts as a rubber seal at a certain temperature, pressure, and in liquid and gas media under static or moving conditions. Diverse types of sealing elements are widely used in machine tools, ships, automobiles, aerospace equipment, chemical machinery, plastic machinery, construction machinery, mining machinery, engineering machinery, petroleum machinery, metallurgical machinery, agricultural machinery, and so on.
The main usage of O Ring is static sealing and reciprocating motion sealing. When used for rotary motion sealing, it is limited to low-speed rotary seal device. On the outer or inner circle, O Ring is often installed in the groove with rectangular cross-section to seal. It also plays a proper sealing and shock absorption role in oil resistance, acid-base, grinding, chemical erosion, and other environments. Therefore, O-Ring is the most widely used rubber seal in the hydraulic and pneumatic transmission system.
Working principle of O Ring
For different kinds of fixed seals or dynamic seals, O Ring seals provide an effective and economical sealing element for designers. O Ring is an element with two-way sealing. The original compression in the radial or axial direction during installation gives the O Ring its own ability to seal. The sealing power generated by the system pressure and the initial sealing force, which increases with the system pressure, is the power that the total sealing force is composed of. O Ring has played a prominent role in static sealing. They are often used in appropriate dynamic situations but sometimes are limited by the speed and pressure at the seal.
O Ring is a kind of extrusion seal, whose basic working principle is that it relies on the elastic deformation of the sealing parts to cause contact pressure on the sealing surface. If the contact pressure is higher than the internal pressure of the sealed medium, no leakage will occur. Otherwise, leakage will occur. When O Ring is used in static and dynamic conditions, the causes and calculation methods of contact pressure on sealing contact surface are different, which should be explained separately.
Features of O Ring
O Ring has the following advantages:
– Fit for a variety of sealing forms: static and dynamic seals are ideal for all kinds of materials. Size and groove have been standardized. Interchangeability is durable.
– Fit for a variety of motion modes: rotational motion, axial reciprocating motion or combined motion (e.g. rotational reciprocating combined motion).
– Fit for various sealing media: oil, water, gas, chemical or other mixed media. Appropriate rubber materials and proper formula design make O Ring seal achieve a practical sealing effect on various chemical media.
– Design simply with compact structure, easy to assemble and disassemble: Sealing performance is reliable because the structure of O Ring itself and installation parts are straightforward, and has formed standardization. As a result, installation and replacement are very convenient.
Selection of O Ring
O Rings with broad cross-section can be a better choice for you. In the case of the same clearance, the volume of O Ring squeezed into the clearance should be smaller than the maximum allowable value of squeezed.
O Ring kit from YBAS Seals Technology are said to be reliable and professional. As one of the leading seal manufacturers, YBAS has always adhered to the high performance and price ratio products to serve customers, owning the full range of mold size as well as a stable and stringent production line to ensure delivery. You can feel free to choose any O Rings with suitable type and size to meet your own needs.
Time to consider carefully about the O Rings in your machines, for the sake of safety as well as good function. To get started with, YBAS will be the right choice.
