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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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+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 criteria for O-rings

Release time:

2018-03-15 12:30

Source:

O-ring seal is the most used sealing form in fluid power system. Because the O-ring has the advantages of simple structure, good sealing performance, small friction, small groove size, easy to manufacture, etc., it is widely used in hydraulic and pneumatic components. The working mechanism of the O-ring is to install the O-ring in the sealing groove, deform it by the pressure of the oil (or gas), squeeze it to the side of the groove, and seal the sealed contact surface. The liquid flow (or air flow) cannot pass through, this kind of seal has a good sealing effect in the fluid power system.

So how to choose the right O-ring, what factors to consider?

1. Working medium and working conditions

In the specific selection of O-ring material, we must first consider the compatibility with the working medium. The working conditions such as pressure, temperature, continuous working time and operation cycle of the seal shall also be comprehensively considered. If it is used in rotating occasions, the temperature rise caused by frictional heat must be considered. Different seal materials have different physical and chemical properties.


2. Sealing form

According to the load type, it can be divided into static seal and dynamic seal; according to the sealing purpose, it can be divided into hole seal, shaft seal and rotating shaft seal; according to its installation form, it can be divided into radial installation and axial installation. For radial installation, for shaft seals, the deviation between the inner diameter of the O-ring and the diameter d2 to be sealed should be as small as possible; for hole seals, the inner diameter should be equal to or slightly less than the diameter d1 of the groove. When installing axially, consider the pressure direction. Under internal pressure, the outer diameter of the O-ring seal should be about 1 ~ 2% larger than the outer diameter d3 of the groove; under external pressure, the inner diameter of the O-ring seal should be about 1 ~ 3% smaller than the inner diameter d4 of the groove groove.


Mingzhen is a professional manufacturer of customized sealing ring processing. We have a professional technical team. Welcome to sample and map. Welcome to inquire: 136-6988-8704.

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What are the molding techniques of rubber products?

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