Specialized Ring Type Joints

RUBBER COATED RING TYPE JOINTS.
BLIND AND ORIFICE RING TYPE JOINTS.

RUBBER COATED RING TYPE JOINTS
This is an oval Ring Type Joint totally enclosed in a nitrile rubber coating. The Ring Type Joint material is usually soft iron or low carbon steel.
This type of gasket has three main functions:

It is used in pressure testing to minimize damage to flanges.
The rubber contact points provide additional seals while protecting the flange surfaces.
It provides increased assurance against corrosion, which can occur between conventional Ring Type Joints and the engaged surfaces of the groove. A wide range of standard sizes are available, with special sizes available upon request.

STYLE R AND RX WITH PTFE INSERTS
Style R and RX Ring Type Joints can also be supplied with PTFE inserts, in order to reduce turbulent flow and eliminate gasket/flange erosion. For the RX style Ring Type Joints, the insert is specially designed with radially drilled pressure passage holes so that the self energizing performance of the RX Ring Joint is not impaired. As can be seen in the sectional view, the insert is located between the inside diameter of the Ring Type Joint and the bore of the flange. On assembly, the insert is completely trapped between the make up of the flanges, filling the annular space between the flange bore and gasket.

TRANSITION RING TYPE JOINTS
These are combination rings which consist of two different sizes having the same pitch circle diameter. They are used for sealing Ring Type Joint flanges where the mating flanges have different ring groove geometry. Transition Ring Type Joints can be manufactured from standard materials, as well as exotic alloys. Transition Ring Type Joints are available with either oval or octagonal facings and are not encompassed within the API or ASME specifications

BLIND AND ORIFICE RING TYPE JOINTS
Blind Ring Type Joints can be manufactured to blank off flanges and pipework. They consist of standard Ring Type Joints with integral solid metal centres. The height of the standard Ring Type Joint section of the gasket is increased to allow for the solid centre to fit in between the two flanges and permit the sealing faces to locate correctly inside the ring grooves. Orifice Ring Type Joints are used for either restricting and / or measuring fluid flow and are sized to customer requirements. As with the Blind Ring Type Joints the height of the Ring Type Joint section is increased to allow for the thickness of the orifice plate. Blind Ring Type Joints can be supplied in all standard and exotic materials. Unless instructed otherwise, Blind / Blank thicknesses are calculated in accordance with ASME B31.3.