Type of hydraulic seal ring

     Hydraulic sealing ring can be divided into two types of static sealing and relative motion between the static sealing surface of the joint surface.The static seal mainly has the seal, the rubber seal and the contact seal three big kinds.According to the working pressure, the static seal can also be divided into low static seal and high-pressure static sealing. Low pressure static sealing material is relatively soft, wide gasket?high-pressure static sealing material is hard, very narrow width of the contact metal gasket.

     The specific structure of the static seal are: flange connection gasket sealing, self tight seal, research and sealing surface, O - ring seal, packing seal, thread sealing, etc. dynamic seal can be divided into two basic types of rotary seal and reciprocating seal.According to the relative motion of the sealing parts and parts of the contact, can be divided into contact and non-contact seal.

     Dynamic sealing of the main structure in the form of: packing seal, mechanical seal, labyrinth seal, sealing diaphragm., contact seal with good sealing performance, but by the friction and wear limit, applicable to the sealing surface of the low speed of occasions.The non contact type seal is poor, and it is suitable for the occasion of high speed.

 The demand of hydraulic rubber o ring.

1) Don’t leak easily

2) With proper mechanical strength and hardness.

3) Compression and resilience are good, permanent deformation is less

4) Do not soften at high temperature, do not break down, do not harden at low temperature, not brittle crack

5) Corrosion resistance, work in acid, oil for a long time, the change of volume and hardness is small, and don’t adhered on the surface of metal

6) corrosion resistance

7) Softness with sealing surface

8) Good ageing resistance, durable

9) The manufacture is convenient, the price is cheap, the material is easy to find.

Rubbers are common seal material. Except rubbers, Graphite, stainless steel, mild steel, copper, aluminum, PTFE and various sealant and so on are for the sealing material.

How to choose the model of hydraulic rubber o ring.

The basic demand for the rubber o ring is that the performance of sealing is great, safe, long work life, the structure of seal is tight, system is simple, to repair and make conveniently, cost less. Most seals are vulnerable parts,you should ensure that their interoperability, to achieve standardization, serialization. Pad seal used the most wildly.

Selection principle of hydraulic seal ring

Hydraulic seal ring selection, for the requirements of the situation can not be used with experience, not suitable for replacement. But for those demanding situations, such as explosion pressure, high temperature of a combustible gas, corrosive medium flow, high flow speed and a certain pressure and temperature, such as pipelines, to choose according to the surface and shape according to the working pressure, temperature, flow of corrosive medium and parts.Generally speaking, under the condition of normal temperature and low use non-metal soft seal, high temperature and medium pressure selection of a combination of metal and non metal sealing pad or metal gasket; under the conditions of temperature and pressure fluctuations should be used elastic or self tightening type sealing gasket; under the low temperature, corrosive medium or vacuum conditions, should use a special performance of hydraulic sealing ring.