O-ring (o rubber seals) characteristics
O ring (O rubber sealing ring) has excellent sealing performance and high working life, and the dynamic pressure sealing life is 5 - 10 times higher than that of conventional rubber sealing products, the highest up to tens of times, and in some conditions can be the same life as the sealing body matrix.
O ring (O rubber ring) friction resistance is small, static and dynamic friction is equal, O ring (O rubber ring) is the rubber ring friction 1/2 - 1/4, can eliminate the low speed, low pressure movement of "crawling" phenomenon.
O ring (O rubber ring) is high wear resistant, and the sealing surface is worn out. It has the function of automatic elastic compensation.
O ring (O rubber sealing ring) has good self lubrication performance. It can be used as oil-free lubrication seal.
O ring (O rubber seal ring) is simple in structure and easy to install.
O ring (O type rubber sealing ring) working pressure: 0-300MPa; speed: 15m/s; working temperature: -55-250 degrees.
O ring (O type rubber seal ring) applicable medium: hydraulic oil, gas, water, mud, crude oil, emulsion, water glycol, acid.
Three, O ring (O rubber sealing ring) applicable range:
O ring (O type rubber ring) is suitable for all kinds of mechanical equipment, in the specified temperature, pressure, as well as in different liquid and gas medium, in static or movement state sealing effect.
O ring (O type rubber sealing ring) in machine tools, automobiles, ships, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and all kinds of instruments are widely used for various types of sealing element.
O ring (O type rubber ring) is mainly used for static sealing and reciprocating sealing. O ring (O type rubber ring) for rotary seal, only limited to low speed rotary sealing device. O ring (O type rubber sealing ring) is generally installed in the outer circle or inner circle, the cross section of the rectangular groove is sealed.
O ring (O rubber sealing ring) still has good sealing and damping effect in the environment of oil resistance, acid base, grinding, chemical erosion and so on. Therefore, the O ring (O type rubber ring) is the most widely used seal in hydraulic and pneumatic transmission systems.
Four, O ring (O rubber ring) advantages:
The O ring (O type rubber seal ring) has the following advantages compared with other types of sealing rings:
1, O ring (O type rubber ring) is suitable for a variety of seals: static seal, dynamic seal
2, O ring (O type rubber ring) is suitable for all kinds of materials, size and groove have been standardized, interchangeability is strong
3, O ring (O rubber ring) suitable for a variety of ways of movement: rotary movement, axial reciprocating movement or combined movement (such as rotating reciprocating combination movement)
4, O ring (O type rubber ring) suitable for a variety of different sealing media: oil, water, gas, chemical media or other mixed media.
5, O ring (O rubber ring) through the selection of appropriate rubber materials and appropriate formula design, to achieve oil, water, air, gas and a variety of chemical media effective sealing effect.
6, O ring (O type rubber sealing ring) the use of a wide range of temperature (- 60 DEG C to + 220 C), the use of fixed pressure up to 1500Kg/cm2 (and reinforcing ring and).
7, O ring (O rubber ring) design simple, compact structure, easy to install and disassemble: O ring (O rubber sealing ring) section structure is extremely simple, and has self sealing effect, sealing performance is reliable. Because the O ring (O rubber sealing ring) itself and the installation site structure are extremely simple, and has been standardized, so the installation and replacement are very easy.
8, O ring (O type rubber ring) material variety:
According to the different fluid selection: nitrile rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (BU), polytetrafluoroethylene (PTFE), natural rubber (NR) and so on
9, O ring (O rubber ring) low cost
10, O ring (O rubber ring) dynamic friction resistance is relatively small
The expression method of O ring (O type rubber seal ring)
Representation of GB/T342.1-1982 O ring (O type rubber seal ring)
Inner diameter D1 X line diameter D2
Implementation of national standard GB3452.1 – 82
For example: O ring (O type rubber sealing ring 20*2.4, -2 GB1235-76 II), 20 representative circle diameter of 20 mm, 2.4 on behalf of aprons section diameter is 2.4 mm, -2 represent the use of rubber types, GB1235 represents the Standard No. 76 represents the standard released in.
Representation of GB/T3452.1-2005
For example: O ring (O type rubber sealing ring) 7.5 * 1.8-G-N,
7.5 - inner diameter
1.8 -- section diameter
G - Series
N -- hierarchy
The material is HG/T2579-2008 method
Expression method of O ring (O type rubber seal ring) for JB/T7757.2-2006 mechanical seal
For example: O ring 7.5 * 1.8-G-N,
7.5 - inner diameter
1.8 -- section diameter
G - Series
N -- hierarchy
Materials: P nitrile rubber, E - ethylene propylene diene monomer three.
Six, O ring (O type rubber sealing ring) installation notes
First, the installation of O ring (O type rubber ring) requirements
Before installing the O ring (O type rubber seal), check the following items:
1. whether the angle is machined according to the drawing, whether the sharp edge is chamfered or inverted round
2. internal diameter whether burr removal, surface pollution
3. seals and parts have been smeared with grease or lubricant (to ensure the medium compatibility of elastomer, it is recommended to use the sealed liquid to lubricate)
4. no grease containing solid additives, such as molybdenum disulfide and zinc sulfide, shall be used.
Two, manually install O ring (O type rubber ring):
1. use tools without sharp edges
2. ensure O ring (O type rubber ring) is not twisted, not excessive stretch O ring (OType rubber sealing ring
3. install the O ring (O type rubber seal ring) as much as possible, and ensure the correct positioning
4. for the O ring (O rubber ring) bonded with sealing strip, shall not stretch at the joint
Three, installation screws, spline and so on
1. when the O ring (O type rubber ring) is stretched, the spindle must be used when the screw, spline, keyway and so on must be used. The mandrel can be made of soft, smooth metal or plastic, with no burrs or sharp edges.
2. tightening screws should be called tightening screws and not tightened in order of direction