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SPETORING® R-B Convex Gasket

SPETORING® R-B convex style seals different than others seals described in this section are widely installed in the standard flanges. Due to the metal – metal contact between the convex surface of the gasket and the flange face the tightness of the joint is very high, gasket is resitance to blowout, chemical attack and fire-safe. Additionally convex gasket geometry in the same moment ensures very long service life time and protects flange face from being damaged. The rule is that the SPETORING® R-B convex gaskets should be produced from material softer than flange faces and in the in special cases you can use galvanic coating or layers (silver, aluminium) to achieve this. Convex seals are manufactured in accordance with many dimension standards beside popular international (ASME, EN, JIS, GOST, etc most popular are DIN 7603 form D for union fittings and DIN 837 for pressure gauges and associated valves).

SPETOACTIV® R-K Self energized metal seal

This special self energized metal seal is the only existing self energized metal seal that request no groove in the flange. It is a combination of self energized v-ring with centering ring which works also as supporting (anti collapsing) ring. Thanks to the SPETOACTIV® R-K supporting ring this seal might be used on flat flanges with no need to have time and efforts taking groove machining operation, which should make Self-Energized Seals an optional solution for most of trouble making applications.

SPETORING® RTJ Transition rings

SPETORING® RTJ transition rings are used for sealing ring type joints in which the flanges have different ring groove diameters or even for jointing two flangesd being totally different style (flange with grove with flat flange style).


SPETORING® R-DC Double Cone Seals are provided commonly to highest duty pressure vessels equipment (mostly in chemical processing industry). Typical working pressure 50-350 bars and typical temperature up to 400°C, diameter between 500 to 3000mm. They are self-energized gasket which construction details need to be designed essentially by the device designers. Although they look similar to octagonal RTJ the rule of sealing effect ot the joint is different than RTJ.

How it works? After being acted by internal pressure, double cone seal expands outward and the contact pressure between gasket and flange increases substancially. Normally at the conical surfaces of the SPETORING® R-DC Double Cone Seal layers of soft metal are installed – mostly silver, soft iron, aluminium or cooper with thicknes of 0,5÷1mm. To increase friction conical surfaces of gasket (which contact with flange surfaces) are often additionally machined: either with 2-5 groovs (0,5÷1mm deep) or given convex shape.

Please note that during fitting the radial gap of 0,05mm for every 100mm of diameter of non-assembled seal should be precisely controlled and at the cylindrical, supporting surface of cover should be machined longitudinal grooves; Hence internal pressure act on the cylindrical internal surface of the gasket.


SPETORING® R-D Delta Seal is used for pressure vessel covers. It requires a special flange construction with triangular grooves. How it works? The total depth of grooves is a little bit lower than the hight of gasket in the non-installed state. When tighten up the bolts, the cover gently approaches to the shell flange. After starting the pressure the delta seal bends cross section and contacts linearly in bottoms of grove under high contact pressure. As being acted by internal pressure the delta seal bends even more outwards, and the conical surface of seal tightly contacts the conical surfaces on seal grooves. Please note the high machining accuracy and high precision of any surfaces of SPETORING® R-D Delta style joints are required! Also the edges of the delta seal can imprint bottoms of grooves, so - after diassambling -machining of grooves and – probably – new gasket with new (increased) hight will be required. Application range of delta seal is up to 2000mm of diameter temperature mostly lower than 400°C and pressure lower than 400 bars.

SPETORING® R-W Bredtschneider Seal (wedge seal)

Bredtschneider Seal is another sulotion used to secure tightness in to self – tightening covers. The construction of seat for this kind of seal is very special and need perfect geometry of conical contact surface both: at cover and shell. For positioning and blocking of gasket special segment ring is needed. The pretightening force of bolt (must be strain bolts in cover and in segmented ring) is very low. The sealing action is coming from internal pressure acting on cover. This working (medium) pressure is multiplicated into contact pressure of SPETORING® R-W in two ways:

1. because surface of cover is many times smaller than contact surface,

2. because wedge geometry of seal multiply axial force into radial contact force. Normally Bredtschneider Seal is manufactured from the material softer than cover and flange material (after installation seal ring is closed almost “hydraulically” from all sides). Please note disadvantage can be observed, when material of ring is too soft and extrude in gaps between cover and shell. In can cause the disassambly difficulties.

Good sealing properties can be kept even when the temperature and pressure fluctuate. The typical application range for Bredtschneider Seal are: pressure to 400 bars, temperature 350°C and diameter 1300 mm. In praxis geometry of this kind of seals can vary: cross section may by symmetrical or not and face surface can be perpendicular to axe of shell or not.