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O-type rubber sealing ring reciprocating dynamic sealing structure characteristics

Release time:

2019-06-04 12:30

Source:

O-ring rubber sealCharacteristics of reciprocating dynamic seal structure
 
The rubber O-ring is a squeeze-type sealing ring, and the basic working principle of the squeeze-type sealing ring is to rely on the elastic deformation of the sealing ring, and cause contact pressure on the sealing contact surface, and the contact pressure is greater than the sealed medium If the internal pressure does not leak, otherwise leakage will occur.
 
In order to ensure the sealing effect, the performance of the sealing material and the design of the sealing structure are very important links. For different types of sealing structures, the compression amount and groove design of the O-ring are different. O-type sealing ring in the valve sealing form mainly has the end face static sealing ring and reciprocating dynamic sealing ring, valve seat sealing ring they are their own different characteristics and structural design.
 
So, the rubber O-ring in the reciprocating dynamic seal structure design have what kind of requirements? In the pilot valve seal, for example, a simple explanation about the structure design requirements of the reciprocating dynamic seal? The main valve of the pilot valve disc and guide sleeve seal between the reciprocating dynamic seal ring.
 
As the smothering valve is a normally closed valve, the frequency of action is generally very low, the movement cycle is very short. When the normal working state, the valve and the guide sleeve for the axial static seal state, only in the valve opening and closing process to have reciprocating motion. When the valve is opened, the main valve flap moves upward. When the valve is closed, the main valve disc side downward movement, and the general mechanical reciprocating dynamic seal is different, O-ring in the radial love to squeeze.

In order to ensure the initial sealing effect without affecting the valve performance, the groove design of the O-ring should consider controlling the radial deformation. The radial compression rate should be controlled within 10-15 percent, and the roughness of the groove should be controlled below Ra0.8pm. When reciprocating under high pressure, the O-ring is easily extruded, and a retaining ring is installed.

O type rubber seal ring is mainly used in petroleum, chemical industry, power station, metallurgy, nuclear power, national defense in various industries. Each sealing ring of the valve is divided into metal o-type sealing ring and non-metal o-type sealing ring according to the contact type. o-type rubber sealing ring (may be referred to as o-ring) is a typical sealing structure of non-metal o-type sealing ring.

Rubber is a kind of elastic polymer sealing ring material (sealing material), which can produce large deformation for small application. This deformation can provide contact stress, compensate leakage gap and achieve sealing effect. Therefore, O-shaped rubber sealing ring is easier to achieve sealing effect than other sealing rings, and the performance of sealing ring is excellent, whether it is used for static sealing ring or dynamic sealing ring, the probability of leakage can be kept to a small extent.

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