Xinhua Xinhua Xu Xu Hydraulic O-rings applied correctly

 

Hydraulic O-ring cross-sectional diameter (diameter) and compression set of relationships. Under certain circumstances the compression ratio, the cross-sectional diameter of the large permanent deformation, the use of large diameter hydraulic cut O-ring to obtain stable sealing. Especially when used as a dynamic seal, having a large cross-sectional diameter to prevent twisting effect.

Hydraulic O-ring is because the compression stress of the material and play a sealing function. Also by the pressure played a sealing fluid and secure seal effect. Therefore, regardless of the pressure on the limit from the principle. The actual use of hydraulic O-ring at the medium will inevitably produce a pressure seal hydraulic fluid while maintaining the wood caused by the O-ring squeeze bite past function.

Therefore, the actual hydraulic pressure of the O-ring is made of mechanical strength of the material (as a representative value is: hardness) determined the relationship between the gap.

(1) plane can be divided into static sealing internal pressure of the case (a) and the external pressure of the occasion (b) categories.

(A) internal pressure of the occasion, in principle, to the O-ring with an outer diameter D,

(B) with the external pressure of the occasion, in principle, to the O-ring with an inner diameter d.

Since the rate is usually no problem crushing the installation, consider the deformation and elongation after the flange surface to withstand the pressure of the bolt, larger than the cylindrical static seal.

(C), the case, because there is no attachment to the wall, sometimes due to pressure changes or wear off, please do not use.

@ Inner diameter is relatively large (l50mm above) and the cross-sectional diameter smaller (3mm or less), there will be a Figure 5 as O-rings fly, with a portion of the hydraulic conditions gripping O-ring is cutting edge, to prevent fly out, you can use thicker sectional diameter.

@ In the use of internal pressure of the occasion, D size is relatively small (about 30mm or less), sometimes installed by unsuitable, D preferably sized slightly larger (about large 0.2-0.3mm) more convenient.

Hydraulic O-rings used in the vacuum appliance, hydraulic and general compared to note the following.

@ Vacuum appliance hydraulic O-ring, since the sealing medium is a gas, liquid and relatively easy to contact surface leakage gap, so great attention to the contact portion of the surface roughness.

@ Not with a vacuum of selected rubber material, the gas molecules to penetrate into the rubber, the rubber material from the surface of the additive dispersion can not maintain the vacuum. See Table 4 on page 7 of a rubber material selected.

@Instructions

· When using oiling way piston seal can be used an O-ring, from life, sealing consider recommended two.

Piston rod seal is recommended and an O-ring and sealed with a dust, and clean in between O-ring seal coating of grease and dust.

When using non-oiling way

You can use two piston seal O-ring between the O-ring coated with grease as a lubricant.

Please use the rod seal oiling whichever way.

@Precautions

Groove dimensions according to JIS P series dimension tables. Press the right size and so on finishing, see Table 5 and Table on page 11 people rod seal with two O-rings when.

Use NOK · KLUEBER lubricant factory SEALUB-SIJ. Cone octave 2 processor-based grease. The coating method may be applied between the O-ring or O-ring between the seal and dust.

When used in low friction dynamic sealing, since the need to change the groove size, from other sources and NOK negotiations.

Precautions design

Ring grooved area crowded by the gap, the gap is by the pressure and hardness of the rubber and the fluid of the decision, a relationship between them as shown in Figure 7, for reference. (Its value is not simply inflated cylinder obtained, about 75% of people design diametrical clearance at high pressure may be this value.

? margin compression

From the functional point of view the seal, the compression margin minimum value is about 8%, the maximum value of the rubber is about 30% compression permanent deformation below. When O-rings, please see the specification table in the groove dimensions.

? the surface roughness of the groove portion

O-ring and a surface roughness of the contact portion of a Table 5 and a 6.

? hole and shaft portion chamfer

In order not to make the installation angle of the O-ring in contact with the cylinder piston rod Jane, damage, be sure to refer to Table 7 down a taper. Also, to prevent the installation sometimes get stuck in the shaft O-ring, recommended size is larger than L (G + b). In the case of the piston rod seal F, O-ring in the sliding portion of the set pressure out of the bar, please absolutely down, does not stop when the O-ring is inserted through the pressure out of the bar, as shown in a clear 8 is chamfered.

Caution

? When the piston rod can not be chamfered and threaded mounting fixture using the icon, pay attention to prevent damage to the O-ring. When the O-ring by a screw, please put a metal sheet or strip the threads, etc. in order to smooth insertion.

? in the O-ring groove means people, please do not pay attention when installing the O-ring distorted.

? O-ring time, apply the sealing medium in the groove and O-rings.

On principle ? Do not reuse O-ring.

? O-ring as it is installed, to keep the machine clean, please do not use cleaning fluid and gasoline, so as to prevent rubber swelling.

Storage-ring

O-rings during storage Please note the following points.

(1) Please do not open the original packaging, when attached to dust on the O-rings may cause damage.

(2) Please keep away from direct sunlight and in a place with low humidity. UV and atmospheric moisture will promote aging and dimensional changes of a plastic material and rubber material aging.

(3) At the time of custody had been opened article, please note that there is no attachment and foreign matter. Please try to still use the original packaging.

(4) Please do not place near the boiler and furnace and other high temperature heat source. Because the heat will promote aging of rubber.

(5) Please do not place in the vicinity of the motor prone to ozone. Please do not hang with string tying hydraulic O-ring metal pin or online, as this would deform the O-ring and lip ends injury

(6) At the time of storage can sometimes produce color, the surface of white powder (blooming phenomenon), no effect on the O-ring hydraulic functions.

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Shenzhen Xu Xinhua Rubber Products Co., Ltd.