Tredobricka BSP

Gummi/stål bricka självcentrerad

Artikelnummer	Storlek	A (mm)	B (mm)	C (mm)	D (mm)	E (mm)	F (mm)
450102	1/8”	15,88	11,84	10,37	0,25	2	8,56
450104	¼”	20,57	15,21	13,74	0,25	2	11,45
450106	3/8”	23,8	18,75	17,28	0,25	2	14,96
450108	½”	28,58	23,01	21,54	0,25	2,5	18,64
450110	5/8”	31,75	24,97	23,49	0,25	2,5	20,6
450112	¾”	34,93	28,53	27,05	0,25	2,5	24,13
450116	1”	42,8	36,88	33,89	0,25	3,4	30,3
450120	1.1/4”	52,38	45,93	42,93	0,25	3,4	38,96
450124	1.1/2”	58,6	51,39	48,44	0,25	3,4	44,86
450132	2”	73,03	63,63	60,58	0,25	3,4	56,67
450140	2.1/2”	90,17	79,38	76,08	0,25	3,4	72,2

Bonded SealBonded Seal

Material Information

Description

Bonded Seals, or also called Dowty seal/Dowty washer, was originally designed to replace copper type washers in higher pressure systems. The seal represents a combination of metal washer and elastomer sealing lip vulcanised to the edge of the metal part to seal bolted connections and mounting elements in all industrial applications e.g. pipe connections and couplings.

Working principle

When the bolted connection is tightened, the sealing lip is pressed against the flat surfaces. The
metal washer ensures that the components to be connected are reliably and securely held. The
thickness of the washer limits the compression of the elastomer seal, eliminates any over torque of the joint, thereby ensuring a reliable sealing system. The internal pressure increases the sealing force by energizing the sealing lip.

Applications

Often used as bolt seals in hydraulic equipment. Today, bonded seals are finding usage in many and varied applications throughout industry.

Operation conditions:
Media
Air, water, mineral oils, water-oil-emulsion, gases etc.
Temperature
-40°C to +120°C depending on of rubber type.
Working pressure:
Countersunk mounting – to appr. 1000 bar.
Non-countersunk mounting – outside diameter D ≤ 40 mm to appr. 250 bar.
Non-countersunk mounting – outside diameter D > 40 mm to appr. 400 bar.

Advantages

• Reliable sealing at low and high pressure
• Easy to use, metal/steel prevent over-compression
• Low bolt torque in comparison to fully metallic seals
• Can be pre-assembled
• Cost effective solution for bolt/thread sealing
• No sweating
• Reusable
In addition to these, the self-centralising version offer further advantages:
• The extra lip ensures that the seal is always correctly positioned beneath the bolt head,
facilitating fitting.
• The seal remains on attached to the bolt if the bolt is removed.
• Countersinking is unnecessary in low-pressure applications, reduce costs.

Surface roughness

The sealing surface should be smooth and free of burr. Surface roughness Ra ≤ 2,5 µm.

Rubber material

Common rubber types we are working with:

Nitrile
Common name: Buna-N, Nitrile, NBR
ASTM D-2000 classification: BF, BK, BG
Chemical definition: Butadiene Acrylonitrile

Nitrile is one of the most widely used rubber materials due to its combination of low cost, resistance to many
chemicals, and good physical properties. The acrylonitrile content of this highly polar elastomer provides
excellent oil and gas permeation resistance which increases as the level of ACN increases.

 

Type:	Nitrile
Hardness range (Shore A)	40 – 90
Continuous high temperature limit	110°
Low temperature capacity	-30°
Tensile range (P.S.I)	200 – 3000
Elongation (Max %)	600

Hydrogenated Nitrile
Common name: HNBR
ASTM D-2000 classification: DH
Chemical definition: Hydrogenated Butadiene Acrylonitrile

HNBR is a hydrogenated version of NBR (nitrile) rubber and is widely known for its physical strength and retention of properties after long-term exposure to heat, oil, and chemicals. HNBR is used in a wide range of applications, including automotive (coolant, AdBlue, oil, fuel systems), industrial applications, oil and gas industries, food and pharma, and medical applications.

Type:	Nitrile
Hardness range (Shore A)	30 – 95
Continuous high temperature limit	150°
Low temperature capacity	-30°
Tensile range (P.S.I)	1500 – 3000
Elongation (Max %)	550

EPDM
Common name: EPDM
ASTM D-2000 classification: CA
Chemical definition: Ethylene Propylene Diene Monomer

EPDM s one of the most versatile types of rubber and is the most suitable for outdoor applications. It is highly resistant to ageing, even when exposed to the most aggressive external conditions: steam, UV rays, ozone, saltpetre or extreme weather conditions. EPDM maintains its properties even when subjected to a wide range of temperature differences. As a result it is consistently used in general industry and in construction, automotive, marine and outdoor applications.

Type:	EPDM
Hardness range (Shore A)	80 – 90
Continuous high temperature limit	120°
Low temperature capacity	-30°
Tensile range (P.S.I)	500 – 2500
Elongation (Max %)	600

Viton® (FKM, FPM)
Viton® is a registered trademark of DuPont Performance Elastomers.
Common name: Viton®, FKM, Fluro Elastomer, Fluorocarbons
ASTM D-2000 classification: HK
Chemical definition: Fluorinated Hydrocarbon

Fluoroelastomers or Fluorocarbons, widely known as Viton®, are among the most suitable rubbers for continuous use at temperatures of 200°C and up to 300°C for short periods. Various grades are available depending upon whether compression set, flexibility (as in diaphragms) or chemical resistance is the prime concern. Fluoroelastomers have excellent resistance to ozone and weathering, oils and most chemicals. They are, however, very expensive, unsuitable for use with phosphate esters and ketones and have poor low temperature capabilities.

Type:	Viton®
Hardness range (Shore A)	60 – 90
Continuous high temperature limit	225°
Low temperature capacity	-25°
Tensile range (P.S.I)	500 – 2000
Elongation (Max %)	300

Silicone (VMQ)
Common name: Silicone, VMQ
ASTM D-2000 classification: FC, FE, GE
Chemical definition: Polysiloxane

Silicone Rubber is an inorganic rubber whose ability to retain its physical properties at elevated temperatures is superior to most other materials. It is also flexible at very low temperatures however its relatively poor tensile, tear strength and abrasion resistance limits use to static applications. Silicone does possess extraordinary resistance to oxidation and ozone degradation due to the absence of unsaturated double bonds in the polymer backbone. Resistance of silicone vulcanizates to gas permeation is generally considered to be poor, as much as 100 times greater than nitrile or butyl, but it is frequently specified in food and beverage applications as it does not impart any taste or odor.

Type:	Silicone
Hardness range (Shore A)	60 – 90
Continuous high temperature limit	225°
Low temperature capacity	-25°
Tensile range (P.S.I)	500 – 2000
Elongation (Max %)	300

Other types on request.

Metal

The most common metal materials we use are:

Mild steel (Carbon steel SAE-AISI 1012)

Hardness, Rockwell B	60
Tensile strength, MPa	370
Yield strength, MPa	310
Elongation at break (in 50 mm)%	19

Stainless steel (AISI 316L, ASTM A240, EN 1.4404)

Hardness, Rockwell B	90
Tensile strength, MPa	530-680
Yield strength, MPa	270
Elongation at break (in 50 mm)%	40

Other types on request.

Surface treatment

The most common surface treatments we use are:

Zinc plating Yellow zinc (Gold zinc) plating

Other types on request.