Ring joint gaskets・Spiral wound gaskets・Grooved gaskets・Other metal gaskets

Metal Gaskets

Ring joint gaskets

Ring joint gaskets are among the safest and highest quality metal gaskets. They are used wherever pipelines and fittings are not only exposed to extremely high pressures, but also have to withstand extreme temperatures. They are used in particular in the petrochemical industry, in power stations, in the oil and gas industry and in the offshore sector.

Our range includes not only oval and octagonal ring joint gaskets, but also a large selection of special shapes. We supply according to our standard materials or according to your specifications.

Please provide us with the following parameters with your order or enquiry: Profile type, ring number and material.

Details

Specifications

We supply the following standards:

  • API 6A (oilfield use).
  • ASME B 16.20 (general) suitable for ASME, BS and DIN/EN flanges.

Profiles

  • Type R (oval and octagonal): Perfect fit for standard ring joint flanges with trapezoidal grooves.
  • Type BX and RX: With complex bevelled edges for pressures above 700 bar.

Dimensions

  • Standard sizes up to 1,200 mm Ø.
  • We are happy to supply larger dimensions on request.
Type R oval

With the oval ring joint gasket, the ring-shaped circular surface of the gasket presses against the trapezoidal groove of the flanges. The sealing surface pressure increases disproportionately when the bolt force is increased.


Type R oval, R 11 to R 105

Standard: ASME B 16.20 / API 6A and EN 12560-5
Flange: ASME B 16.5 and 16.47 A
Pressure rating: Class 150 – 10,000

Type R octagonal

The octagonal ring joint gasket acts like a spherical gasket and therefore creates a larger contact or sealing surface. The effect is greater than with oval ring joint gaskets. The sealing surface pressure increases proportionally as the bolt force is increased.

Type R octagonal, R 11 to R 105
Standard: ASME B 16.20 / API 6A and EN 12560-5
Flange: ASME B 16.5 and 16.47 A
Pressure rating: Class 150 – 10,000

Type BX

The seal has a square cross-section with bevelled corners. The diameter of the ring joint gasket type BX is slightly larger than that of the groove. In this way, it remains pre-compressed and thus creates a high sealing value. The equalising bores correspond to the API. The sealing surface pressure increases proportionally as the screw force is increased.

Type BX, BX 150 to BX 172
Standard: API 6 A
Flange: API 6 BX
Pressure rating: Class 2,000 – 20,000

Type RX

The seal was developed to utilise the pressure of the fluid and increase the sealing values. The greater the internal pressure, the more the lateral surfaces of the Type RX ring joint gasket press into the groove surfaces. The sealing surface pressure increases proportionally as the screwdriving force increases.

Type RX, RX 20 to RX 201
Standard: ASME B 16.20 and API 6 A
Flange: API 6 B
Pressure rating: Class 2,000 – 20,000

Spiral wound gaskets

The secret of the spiral wound gasket is a coiled “V”-shaped steel strip. Under pressure, it presses against the flanges and compresses the filling material at the same time. The many advantages of spiral wound gaskets are used in conventional and nuclear power stations, chemical and petrochemical plants, refineries, in boiler and apparatus construction, high-pressure pipelines with flange connections, in paper and pulp production and in the aerospace industry.

We offer all spiral wound gaskets with and without inner and outer rings. Our spiral wound gaskets can be used universally and can easily seal substances such as water, alkalis, vapour, acids and gases. If you require particularly chemically resistant versions of our spiral wound gaskets, we will be happy to present you with customised solutions.

Details

Specifications

We supply in accordance with the following standards: ASME B 16.20 suitable for ASME, BS, JIS, works standards and DIN/EN flanges.

We offer different versions of these exclusive gaskets. Depending on your requirements and area of application, we can provide you with the optimum equipment.

Profiles

Profiles

Type SW – Spiral wound gasket without inner and outer ring for force shunt and tongue and groove applications.

Type SW-I – Spiral wound gasket with inner support ring. For front and rear flanges.

Type SW-O – Spiral wound gasket with centring ring. For flanges with and without sealing strip.

Type SW-IO – Spiral wound gasket with centring ring and inner ring. Gasket for flange connections with and without sealing strip.

Work standards

Standard: EN 1514-2
Type SW-IO: SW-I and SW-O
Flange: DIN
Pressure level: PN 10 – 160

Standard: EN 12560-2
Type SW-IO: SW-I and SW-O
Flange: ASME B 16,5 and prEN 1759-1
Pressure level: Class 150 – 2,500

Standard: Work standard 104
Type SW-IO: SW-I and SW-O
Flange: DIN
Druckstufe: PN 10 – 400

Standard: ASME B 16,20 Serie A
Type SW-IO: SW-I and SW-O
Flange: ASME B 16,47 Serie A
Pressure level: Class 150 – 900

Standard: ASME B 16,20 Serie B
Type SW-IO: SW-I and SW-O
Flange: ASME B 16,47 Serie B
Pressure level: Class 150 – 900

Characteristic values

Characteristic values for spiral wound gaskets
*depending on: Flange type, temperature, pressure, medium

The maximum permissible temperature that can generally be controlled with graphite in continuous use is approx. 460 °C at the sealing surface. Specifications for temperatures from 480 °C – 550 °C are based on laboratory data.

Preload forces

Preload forces and tightening torques for screws

  • Preload forces (kN) and tightening torques (Nm) for with expansion shank and full shank at 70% of the minimum length.
  • Coefficient of friction = 0.14.

Grooved gaskets

The grooved gasket is one of the technical standards, particularly in power stations and nuclear power plants. It is used, for example, as a heat exchanger gasket, for manhole covers and for valve covers in the steam circuit. The sealing surface of the metal core consists of a sealing surface profiled with 45° grooves, on which a soft material layer is installed. The latter consists exclusively of particularly high-quality materials such as graphite or PTFE.

Due to its good spring-back properties, the grooved gasket is ideally suited for applications with alternating temperature and pressure loads. This is why it is often referred to as a combination gasket.

Details


Specifications

The grooved gaskets in our range can be used for all standardised flanges from DN 10 to DN 3600. If you require special shapes, we can of course also offer you customised solutions that are also characterised by a high level of quality.

Profiles

Profile

Type KPC – Grooved gasket with centring ring: centring ring with and without predetermined breaking point.

Type KPC-T – Grooved gasket with loose centring ring.

Type KP – Grooved gasket for tongue and groove flanges.

Work standards


Standard: EN 1514-6
Type KPC: KP and KPC-T
Flange: DIN
Pressure level: PN 10 – 400

Standard: EN 12560-6
Type KPC: KP and KPC-T
Flange: prEN 1759-1
Pressure level: Class 150 – 2,500

Standard: Work standard 101
Type KPC: KP and KPC-T
Flange: DIN
Pressure level: PN 10 – 400

Standard: Work standard 146
Type KPC: KP and KPC-T
Flange: ANSI B16,5
Pressure level: Class 150 – 2,500

Standard: Work standard 147
Type KPC: KP and KPC-T
Flange: ANSI B 16,47 Serie A
Pressure level: Class 150 – 2,500

Characteristic values

Characteristic values for grooved gaskets
* depending on: Flange type, temperature, pressure, medium

  • The maximum permissible temperature that can generally be controlled with graphite in continuous use is approx. 460 °C at the sealing surface.
  • Specifications for temperatures from 480 °C – 550 °C are based on laboratory data
Preload forces

Preload forces and tightening torques for screws

  • Preload forces (kN) and tightening torques (Nm) for with expansion shank and full shank at 70% of the minimum length.
  • Coefficient of friction = 0.14.

Other metal gaskets

Lens gaskets

Lens gaskets are characterised by a whole range of advantages. This type of seal is insensitive to overpressing and can be used several times. This makes them highly attractive for several industrial sectors.

Corrugated gaskets

Corrugated gaskets are available in very different versions. They are available as round, oval and elongated rings with webs or tabs as well as with and without supports.

The enormous variety of this type of gasket means that they are used in a wide range of applications. In particular, wherever flanges with low flexural strength are used.

We offer three basic variants in our range, all of which can be supplied by us in different variations if required.

  1. Gaskets with flat soft material overlays
  2. With cord supports
  3. All-metal without support

Metal flat gaskets

Metal flat gaskets are used where, for example, special temperature and pressure values make it impossible to use other gaskets. The thickness of the metallic flat gaskets varies depending on the nature of the flange surfaces and the operating conditions.

We offer you flat gaskets made of different metals in our range.

  • Steel and iron: 1.0038, 1.0308, 1.0333, 1.0335, 1.1003
  • Stainless steel: 1.4000, 1.4016, 1.4021, 1.4301, 1.4401, 1.4404, 1.4541, 1.4550, 1.4571, 1.4828, 1.4876
  • Heat-treatable stainless steel: 1.5415, 1.7335, 1.7362, 1.7380
  • Metals: copper, brass, lead, nickel, monel, aluminium, aluminium composite

Rubber-steel gaskets

Rubber-steel gaskets consist of a steel ring encased in rubber (caoutchouc), which makes them not only corrosion-resistant but also media-protected.

The optimum area of application for rubber-steel gaskets is wherever effective sealing of cool substances with low leakage rates, coupled with low bolting forces, is required. The internal steel ring prevents the seal from being pressed out by the prevailing pressure.

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