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Dongguan Mingzhen Rubber & Plastic Products Co., Ltd.

18 yearsFocus on R & D and production of silicone rubber products

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Service Hotline:

+86-136 6988 8704

Dongguan Minz Rubber & Plastics Co., Ltd.

Add.: No.4, New Industrial Road, Shipai Tangwei, shipai town, Dongguan City
Tel: +86-0769-8665 2688
Fax: +86-796-8180 6477
Contact: Miss Li +86-136 6988 8704
Mailbox:lixiaoxia@dgminz.com.cn

Selection of O-ring

Release time:

2019-05-24 12:30

Source:

o-ring sealSelection
 
1.O-ring(O-ring) Overview:
O-ring (O-ring)(O-rings) is a rubber sealing ring with a circular cross section. Because its cross section is O-shaped, it is called O-shaped rubber sealing ring, O-shaped sealing ring, also called O-ring.
 
O-ring (O-ring rubber seal) began to appear in the middle of the 19th century, when it was used as a sealing element for steam engine cylinders.
Features of 2. O-ring (O-ring):
 
O-ring(O-type rubber sealing ring) excellent sealing performance, high working life, dynamic pressure seal working life than conventional rubber sealing products 5-10 times, up to dozens of times, under certain conditions can be with the sealing body matrix with life.
 
O-ring (O-type rubber sealing ring) friction resistance is small, dynamic and static friction is equal, O-ring (O-type rubber sealing ring) is rubber ring friction force 1/2-1/4, can eliminate low speed, low pressure movement "crawling" phenomenon.
 
O-ring (O-type rubber sealing ring) is highly wear-resistant, and has automatic elastic compensation function after the sealing surface is worn.
O-ring (O-ring rubber seal) good self-lubricating performance. Can be used as oil-free lubrication seal.
O-ring (O-ring rubber seal) has simple structure and easy installation.
O-ring (O-shaped rubber sealing ring) working pressure: 0-300MPa; working speed: 15 m/s; working temperature:-55-250 degrees.
 
O-ring (O-type rubber sealing ring) applicable medium: hydraulic oil, gas, water, mud, crude oil, emulsion, water-glycol, acid.
3. O-ring (O-ring rubber seal) Scope of application:
O-ring (O-shaped rubber seal ring) is suitable for installation on various mechanical equipment, in the specified temperature, pressure, and different liquid and gas media, in the static or moving state of the sealing effect.
 
O-ring (O-ring rubber seal) in machine tools, ships, automobiles, aerospace equipment, metallurgical machinery, chemical machinery, engineering machinery, construction machinery, mining machinery, petroleum machinery, plastic machinery, agricultural machinery, and all kinds of instruments and meters It is a large number of applications of various types of sealing components.
 
O-ring (O-shaped rubber sealing ring) is mainly used for static sealing and reciprocating sealing. When O-ring (O-ring rubber seal) is used for rotary motion sealing, it is limited to low-speed rotary sealing device. O-ring (O-type rubber seal ring) is generally installed in the outer circle or inner circle on the cross-section of the rectangular groove for sealing.
 
O-ring (O-type rubber seal ring) in the oil, acid and alkali, grinding, chemical erosion and other environments still play a good sealing, shock absorption. Therefore, O-ring (O-ring rubber seal) is the most widely used seal in hydraulic and pneumatic transmission system.
 
Advantages of 4. O-ring (O-ring rubber seal):
O-ring (O-ring rubber seal) compared with other types of seals, has the following advantages:
 
1. O-ring (O-shaped rubber sealing ring) is suitable for various sealing forms: static sealing and dynamic sealing
 
2. O-ring (O-shaped rubber sealing ring) is suitable for various materials, the size and groove have been standardized, and the interchangeability is strong
 
3. O-ring (O-shaped rubber sealing ring) is suitable for a variety of motion modes: rotary motion, axial reciprocating motion or combined motion (such as rotary reciprocating combined motion)
 
4. O-ring (O-shaped rubber sealing ring) is suitable for a variety of different sealing media: oil, water, gas, chemical media or other mixed media.
 
5. O-ring (O-shaped rubber sealing ring) can effectively seal oil, water, air, gas and various chemical media by selecting appropriate rubber materials and appropriate formula design.
 
6. O-ring (O-shaped rubber sealing ring) has a wide temperature range (-60 ℃ ~ 220 ℃), and the pressure can reach 1500Kg/cm2 when fixed (used with reinforcing ring).
 
7. O-ring (O-shaped rubber sealing ring) has simple design, compact structure and convenient assembly and disassembly: O-ring (O-shaped rubber sealing ring) has extremely simple cross-sectional structure, self-sealing effect and reliable sealing performance. Because the O-ring (O-shaped rubber seal 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-shaped rubber sealing ring) has many kinds of materials:
 
Can be selected according to different fluids: nitrile rubber (NBR), fluorine rubber (FKM), silicone rubber (VMQ), ethylene propylene rubber (EPDM), chloroprene rubber (CR), butyl rubber (BU), polytetrafluoroethylene (PTFE), natural rubber (NR), etc.
　
9. O-ring (O-shaped rubber sealing ring) low cost
　
10. O-ring (O-shaped rubber sealing ring) has relatively small dynamic friction resistance
　
5. O-ring (O-ring rubber seal) representation:
GB/Representation of T342.1-1982O rings (rubber O-rings)
inner diameter; wire diameter
Implementation of national standard
For example: O-ring (O-shaped rubber sealing ring) 20*2.4, II -2GB1235-76, 20 represents the inner diameter of the large ring is 20mm, 2.4 represents the cross-sectional diameter of the rubber ring is 2.4mm, II -2 represents the type of rubber used, GB1235 represents the standard number, and 76 represents the standard publication year.
Representation of GB/T3452.1-2005
For example: O-ring (O-ring rubber seal) 7.5
7.5 inner diameter
1.8 section diameter
G Series
N level
Material using HG/T2579-2008 method
JB/T7757.2-2006 Representation of O-rings (rubber O-rings) for mechanical seals
For example: O-ring 7.51.8-G-N,
7.5 inner diameter
1.8 section diameter
G Series
N level
Material: P nitrile rubber, E EPDM rubber, etc.
　
Precautions for Installation of 6. O-Ring (Rubber O-Ring)
　　
Requirements for 1. mounting O-rings (rubber O-rings)
Before installing the O-ring (rubber O-ring), check the following:
1. Whether the lead-in angle is processed according to the drawing and whether the sharp edge is chamfered or rounded
2. Whether there is no pollution on the surface of the inner diameter after removing burrs
3. Whether the seals and parts have been coated with grease or lubricating fluid (to ensure the compatibility of the elastomer medium, it is recommended to use the sealed liquid to lubricate)
4. Do not use greases containing solid additives, such as molybdenum disulfide and zinc sulfide.
　　
2. manual installation of O-ring (O-ring rubber seal):
1. Use tools without sharp edges
2. Ensure that the O-ring (O-shaped rubber sealing ring) is not twisted, and the O-ring (O-shaped rubber sealing ring) shall not be stretched excessively.
3. Try to use auxiliary tools to install O-ring (O-ring rubber seal) and ensure correct positioning
4. For the O-ring (O-shaped rubber sealing ring) bonded with the sealing strip, it shall not be stretched at the joint
　
3. mounting screws, splines, etc.
1. WhenO-ring(OType rubber sealing ring) After stretching, the installation mandrel must be used when passing screws, splines, keyways, etc. The mandrel can be made of a relatively soft, smooth metal or plastic and must not have burrs or sharp edges.
2. When installing the compression screws, the screws should be tightened symmetrically and not in the order of direction.

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The advantages of silicone sealing ring, the disadvantages of silicone sealing ring

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