HELICOFLEX®
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HELICOFLEX® SPRING-ENERGIZED METAL SEALS WORLD CLASS SEALING TECHNOLOGY Source: Credit © CERN

Introducing the HELICOFLEX Seal ® The HELICOFLEX® seal is a resilient high performance metal seal that was created as part of a joint technical collaboration with the French Atomic Energy Commission (CEA). Its incredible performance is a result of many years of research, experimentation and practical application in key markets such as Nuclear, Physics Research, Chemical, Aerospace, Oil & Gas and Industrial. HELICOFLEX® design flexibility allows Technetics engineers to customize the seal characteristics to match each unique application. HELICOFLEX® SEALING CONCEPT The sealing concept of the...

Metal to Metal Assembly The metal to metal assembly consists in generating a solid mechanical contact independent of the active part of the seal. The seal elasticity is exclusively dedicated to maintaining the sealing. This concept protects the seal from over tightening. AFTER TIGHTENING BEFORE TIGHTENING The HELICOFLEX® seal requires, in case of a static sealing application, controlled compression either by means of a groove A or by means of a built-in compression limiter B. In case of a semi-static application, it requires a controlled seating load C. ADVANTAGES OF THE METAL/METAL CONTACT...

Advanced Sealing for Critical Applications BASIC VERSION Standard circular Cross Section (C.S.) USED IN MOST CASES WITH: • single or double lining • single or double C.S. In the various types or shapes mentioned in pages 7 to 16 ADAPTABILITY BY THE SEAL GEOMETRY N.mm -I The seal section is oval and allows its use in trapezoidal grooves in place of RTJ gaskets The grinding of the spring according to an angle ß perfectly gives the possibility to modulate the seal tightness Wire Section Has an internal limiter to control the compression Used in a non metal to metal assembly Particular shape of...

ADAPTABILITY BY THE MATERIAL CHOICE Sealing lining: Aluminum - Gold - Silver - Iron - Copper - Brass - Soft Steel - Nickel - Monel - Tantalum Stainless Steel (304L - 316L - 321 - 316 Ti) - Zirconium - Inconel (600 - 625) - Hastelloy - Titanium - Tin Special materials on demand Coatings: Gold - Silver - Tin - Nickel - FEP Spring: Nimonic 90 - Alloy 718 - Alloy 750 - SS - XC80 ADAPTABILITY TO THE APPLICATION Also for: Pneurop flanges, for conical flanges, for remote handling, for valves. • HELICOFLEX®/RUBBER SECTION • DOUBLE HELICOFLEX® SECTION • SEAL WITH SPACER • SEAL WITH LEAK CHECK • VERY...

SEALING CRITERIA The characteristic values given in this catalog are designed to meet 2 distinct sealing criteria. The choice of sealing criteria according to the different assembly requirements (gas sealing, liquid sealing, toxicity, pollution, „.) must be done before designing the assembly due to the consequences. • The "bubble tight" sealing corresponding to a gaseous flow of air < 10-5 Pa.m3.s-1 (10-4 atm.cmTsec-1) under 1 bar AP. • The Helium sealing corresponding to a gaseous flow of Helium < 10-10 Pa.m3.s-1 (10-9.atm.cm3.sec1) under 1 bar AP Some lower gas flow (10-12 Pa.m3.s-1) can...

Characteristic Values LOAD VERSUS DEFLECTION CURVE The compression and decompression cycle of the HELICOFLEX® seal shows a progressive flattening of the curve. The position of this step is selected according to the required sealing and the lining material. Y0 = Linear load from where the required sealing level is obtained. Y2 = Linear load to reach the seating point and the metal to metal contact. e2 = Compression value to get the metal to metal contact. It is related to the linear load Y2 and determines the groove depth. ec = Critical compression value beyond which the sealing level could...

Table of Characteristic Values (standard HN, axial compression) SURFACE FINISH 1,6 to 3,2 ^m SOLUTIONS ENGINEERED TO FIT YOUR EXACT SPECIFICATIONS

LINING: SILVER COMPRESSION HELIUM SEALING T°C maxi C.S. mm RECOMMENDED BUBBLE SEALING SURFACE FINISH

Table of Characteristic Values (Continued) (standard HN, axial compression) LINING: COPPER, SOFT IRON, MILD STEEL COMPRESSION HELIUM SEALING T°C maxi BUBBLE SEALING

LINING: NICKEL, MONEL, TANTALUM HELIUM SEALING BUBBLE SEALING WORLD CLASS SEALING TECHNOLOGY

Table of Characteristic Values (Continued) (standard HN, axial compression) LINING: STAINLESS, INCONEL, TITANIUM, ZIRCONIUMCOMPRESSION HELIUM SEALING T°C maxi BUBBLE SEALING 0,8 to 1,6 ^m Please consult us For materials not listed and coated seals (Gold, Silver, Tin, Nickel, FEP). • For the HELICOFLEX® beta HNR see page 16. • For HELICOFLEX® delta HNV, see page 15. • For radial or 3 faces compression,see page 14. SOLUTIONS ENGINEERED TO FIT YOUR EXACT SPECIFICATI

Calculation Data for HELICOFLEX® Seal The tightening load for a HELICOFLEX® seal can be calculated according to the CODAP (Annexe C6A4) or by analogy with the calculation done for the flat gaskets. WE CAN SUPPLY CALCULATION DATA SHEET ACCORDING TO THE FOLLOWING PROCESS: Fj Seating load of the seal Ff Hydrostatic force from the pressure Ym Minimum linear load to keep the sealing Fm Minimum load to keep the sealing Fs Total load to insure the sealing Fs* Total load taking into account the young modulus compensation Fm FB1 is the minimum load to be applied on the assembly in order to reach the...

Design Considerations Dimensions of the seals according to the assembly. AXIAL COMPRESSION Internal Pressure P ≥ 20 bars External Pressure P ≥ 20 bars • Groove assembly : at the end of compression the seal should be in contact with and supported by the groove wall opposed to the pressure side. J Ø d (C.S.) h = d - e2 0,3 1,5 à 3,4 Internal pressure: 0,5 3,5 à 6,9 Ø B = OD - J 0,7 7 à 9,9 0,9 > 10 Ø A ≥ ID + 2e2 + 0,5 Same concept with internal back up. It is the groove ID which has to contact & support the seal J = clearance between seal OD and Groove OD J = f (d) (see table) External or...