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Ring Joint Gasket

Ring joint gasket can be used under the vacuum condition of 1000kgf/cm² and more for high-pressure vessel, tower and vessel, valve bonnet, etc. including high-temperature and high-pressure steam, oil, gas, solvent, etc.

There are oval type and octagonal type as its representative shape, which can be generally used for pressure of max. 350kgf/cm2 and there is BX type for more pressure. As for oval type and octagonal type, oval type has bigger flange groove deformation.

It is because gasket itself is deformed while bolt is extended until arriving to constant pressure by increased flange connection pressure and line contact is moved to surface contact as well. Therefore, it has good initial sealing performance but gasket is largely deformed.

When Octagonal type is internally pressured, contact pressure with flange is increased, which is initially connected to surface contact. So it requests high connection pressure. But as for sealing characteristics, we can’t clearly say what type is better. Generally, octagonal type is widely used. RX type can be used for flange groove of ring joint gasket but BX type can be only used with API- STD-6BX flange.

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Name	Cross Section	KUKIL NO.
API Type R oval ring-joint		RJO
API Type R octagonal ring-joint		RJS
API Type RX pressure engergized ring-joint		RJRX
API Type BX pressure engergized ring-joint		RJBX
Modified Bridgeman ring-joint		RJB
Delta ring-joint		RJD
Lens ring-joint		RJL
Double cone ring-joint		RJW
Round ring-joint		RJR
Weld ring		WDR

-. RING JOINT GASKET HARDNESS Production Standards

-. Identification mark according to ASME B16.20 standards

-. Shape according to the classification of Ring Joint Gasket