PRECISION SEALING SYSTEMS
90Pages

Precision Sealing

CATALOGUE Precision Sealing In-house Manufacturing, Authentic Sealing

2 - HOW DOES AN O-RING WORK? 7 2.1 - Operational Principle of the O-Ring 7 2.2 - Influence Of Compound Characteristics 2.2.4 - The impact of fluid type 8 3.1 - Standard compounds in stock 9 3.4 - Chemical compatibility table 14 4 - TYPES OF O-RING INSTALLATION 18 4.3 - Groove width and depth 18 4.4 - Inside diameter of the seal 18 5.1.1 - Groove dimensions and shape 20 with reciprocating movement 22 5.2.1 - Groove dimensions and shape 22 5.3 - Low speed rotary applications 23 6.2 - O-ring installation recommendations 24 6.4 - O-ring lubrication and surface treatments 25 7 - STORAGE AND...

2.2 - Reduced starting torque 58 2.4 - Reduced residual film 58 2.7 - Position of the land area 59 3 - SELECTION OF FOUR-UPS SEALS 59 3.2 - Standard compounds for four-lips seals 60 1.1 - Auto-centralising bonded seal 76 FOR SELECTING BONDED SEALS 78 5 - DIMENSIONS & GROOVE SIZES 63 6.5 - Surface condition and protection 64 non self-centralising bonded seals 82 - DESIGNER 5 MANUFACTURER 4 . A BRQAD NETWORK OF DISTRIBUTORS OF YOUR FUTURE SEALING SOLUTIONS 84 We advise you to carefully read the recommendations for assembly set out in this catalogue. Our technical services are at your disposal...

In-house Manufacturing, Authentic Sealing Precision Sealing

1 - DEFINITION - GENERAL INFORMATION 1.1 - O-Rings The “O-Ring” seal is a circular ring with a round cross-section It is the simplest of sealing systems, combining: - maximum effectiveness,  - small space requirements, - low cost and - complete symmetry, reducing the risk of incorrect installation. The O-Ring may be used: - in either static or dynamic applications (low speed rotation or oscillating movement) - for applications ranging from cryogenics to high temperatures. - at pressures ranging from High Vacuum up to 2,000 bars. In order to make the best possible use of the sealing...

2 - HOW DOES AN O-RING WORK? 2.1 - OPERATIONAL PRINCIPLE OF THE O-RING When an O-Ring fitted into a groove is subject to the pressure of a fluid, it compresses itself against the seating surface that is located on the opposite side of the source of pressure. The seal acts as a wedge in the angle that exists between contact surfaces a and b. The seal is usually fitted in its groove with an initial deflection (the depth of the groove is smaller than the cross-section diameter of the seal). The contact forces caused by the change in the seal's shape make it possible to maintain the seal's...

2.2.3 - TEMPERATURE-RELATED BEHAVIOUR • LOW TEMPERATURES At low temperatures, a slight contraction of the rubber, in combination with hardening, may cause leakage in a system. Compared to metals, rubber compounds have a high thermal expansion coefficient. These phenomena should particularly be taken into account when gasses are involved and when the initial deflection of the components is low. N.B: The hardening of rubber compounds in low temperatures is a reversible phenomenon. In other words, the rubber fully regains its initial characteristics when the temperature increases again. If the...

3 - RECOMMENDATIONS FOR THE SELECTION OF COMPOUNDS The compound should be chosen according to the following information : a) For the type of elastomer: b) For hardness - service pressure  - type of use - nature of the fluid(s) in contact  - temperatures in continuous and peak service (at seal level) - nature of the materials in contact 3.1 - STANDARD COMPOUNDS IN STOCK Four compounds are selected as standard for most applications. Nitrile (NBR) hardness 70 PB 701 Nitrile (NBR) hardness 80 PC 851 Ethylene Propylene (EPDM) hardness 85 EP 851 Fluorocarbon (FKM) hardness 80 DF 801 The majority...

3.3 - USER GUIDE APPLICATION TYPE •  ydraulic and H pneumatic GENERAL CHARACTERISTICS OF THE RUBBER Good resistance to -  mineral oils -  domestic gas -  water up to 70° C -  fuels -  aliphatic solvents Poor resistance to - atmospheric agents -  acids -  brake fluids HARDNESS IRHD Black Black •  ineral oil and fuel M circuits Good mechanical characteristics NBR (PVC) •  alves and fittings V hot water •  oolant C circuit Same as Nitrile Higher resistance to fuels EPDM (Ethylene Propylene) Very good resistance to: -  ater, steam and water-based soluw tions in general -  synthetic brake fluids...

APPLICATION TYPE •  ower P steering •  ir conditioning A GENERAL CHARACTERISTICS OF THE RUBBER ELASTOMER HNBR (Hydrogenated nitrile) Good resistance to -  aggressive mineral oils -  atmospheric agents -  water, steam -  diluted bases Poor resistance to -  fuels -  brake fluids HARDNESS IRHD Self-lubricating - Improved resistance to oils Improved resistance to oils Very good mechanical characteristics Resistance to abrasion HNBR 70 according to standard NFT 47503 Self-lubricating - Improved resistance to oils 9DT1889 •  Steam •  Hard vacuum Very good resistance to: -  water and steam - ...

3 DH 710 A26 B16 EO16 EO36 hardness 75 Z1 = tensile strength of 18 MPa min. according to ASTM D412 Z2 = not brittle after 3min at –40°C according to ASTM D 2137 3 DH 710 A26 B16 EO16 EO36 hardness 75 4 DH 820 A26 B16 EO16 EO36 Z1 Z2 Z1 = tensile strength of 20 MPa min. according to ASTM D412 Z2 = not brittle after 3min at –40°C according to ASTM D 2137 3 DH 920 A26 B16 EO16 EO36 Z1 Z2 Z1 = not brittle after 3min at –40°C according to ASTM D 2137 Z2 = Variation in volume after immersion in IRM 903 oil according to ASTM D471: +10% Max. 2 DA 710 A26 B36 ASTM D 2000 4 DH 614 B36 EO16 EO36 3 DH...

3.4 - CHEMICAL COMPATIBILITY TABLE REMARKS Please note that operational conditions (temperature, pressure, friction, etc...), as well as combinations of several substances can modify, sometimes to a great extent, the aggressiveness of the fluids which are in contact with the seals. It is therefore recommended that tests be conducted before a final selection is made. (FOOD GRADE): Chemical substances whose name is followed by: “(food grade)” are those in contact with which it may be necessary to use a compound effectively meeting the "food grade" criteria. Please consult our services for...