First, how to match the hardness and pressure of imported O ring
How much hardness is used is positively related to the pressure. That is to say, the greater the pressure, O-ring hardness to the greater. Normally, the conventional hardness of nitrile rubber NBR, three ethylene propylene diene monomer EPDM and silica gel SIL is 70 degrees, while the conventional hardness of fluorine rubber FKM/VITON is 75 degrees. We know that the O-ring relies on elastic deformation caused by the sealing force. So, if the pressure is not large, it is better to choose the lower hardness, because the low hardness of resilience is better, the sealing is also better. In that case, can we make the hardness 35 or lower? Of course not as good. Because we must consider the difficulty and cost of processing. The machining range of general hardness is 40~90 degree of shore hardness. The corresponding pressure range is 0~35Mpa. If the pressure is greater, it should be used with the retainer ring. The retaining ring is divided into two types: notch type: incision and side into 22 degree angle and B type (closed type) A. At present, the more used is the Teflon ring (PTFE), it belongs to A type ring.
Two. Brief introduction of imported sealing ring
Commonsealing ring: O-ring, O-ring, rubber seal ring, X ring (star ring), ED (ring pipe joint sealing ring), rubber ball, L ring, V ring, YX ring, UHS ring, UN ring, DKB type dust ring rectangular sealing ring, DHS type dust ring, PTFE sealing ring, UPH ring, TC seal etc..
The advantages of sealing ring: long life, durable sealing; high pressure resistance, high and low temperature wear resistance, small friction; chemical resistance, corrosion resistance, in a variety of medium is not easy to dissolve or expand.
1/ O type sealing ring: the most widely used sealing element in all sealing rings. It is mainly used for static seal and reciprocating seal.
1/ Y seal ring is widely used in reciprocating seals.
2/ V type sealing ring: a kind of axial elastic rubber sealing ring, used as a shaft without pressure seal. The sealing lip has activity and good adaptability, can tolerance and compensation of angle deviation, can prevent the internal leakage of grease or oil solution is also can prevent the intrusion of external, splash or dust.
YX type sealing ring for 3/ hole: Seal of piston in reciprocating hydraulic cylinder. Material: polyurethane TPU, CPU, rubber. Working medium: hydraulic oil, emulsion. Working temperature: TPU:- 40 ~ +80; CPU:-40 ~ +120 centigrade.
Working pressure: 32Mpa; hardness: 85 degrees. TPU: general hydraulic cylinder, general equipment, hydraulic cylinder. CPU: hydraulic cylinder and high temperature and high pressure cylinder for engineering machinery.
4/ rectangular sealing ring: generally installed in the outer circle or inner circle, the cross section is rectangular groove, sealing effect.
Three. Specifications and specifications of rubber seals
O-ring/ O-ring specifications are expressed in two forms, the diameter of wire diameter (ID*C/S) and * * outer diameter of wire diameter (OD*C/S), which bore diameter is the most commonly used. Taiwanese Xu Meike (XOK), seal specifications, strong technical force. Like NBR, the conventional size of NBR is basically available. In addition, EPDM, SIL, FKM/VITON and so on also have a large number of spot.
O circle has all kinds of thickness, such as C/S can be from 20 mm to 0.3 mm, and the diameter of ID can be small to 0.6 mm, as large as 2200mm. XOK specifications are as follows, but not limited to the following specifications, what specifications are required, please contact us for further confirmation