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The Straub Open-Flex Coupling comes in several different wrap-around configurations that allow them to be used to connect or repair pipework without removing existing pipes. Choose from jointed, slotted, two-part, or three-part.

A progressive sealing effect increases the force on the sealing lips as the pressure in the pipe increases. This gives the pipework flexibility at every joint with anchoring and sealing functions that are independent from each other.

You can use these reusable Open-Flex Coupling on plain-ended pipes without additional modifications.

The Open-Flex 1L model has a size range of 48.3–168.3mm while Open-Flex 2 is available from 172–2032mm.

Technical specifications

Brand

Straub

Model

Open-Flex 1L
Open-Flex 2

Size range

Open-Flex 1L: 48.3–168.3mm
Open-Flex 2: 172–2032mm

Nominal pressure

Open-Flex 1L: 16 bar
Open-Flex 2: PN2.5, PN6, PN10, PN16, PN20, PN25

Material specifications

Casing

Open-Flex 1L: AISI 316 L or similar
Open-Flex 2: S355MC hot-dip galvanised, AISI 316 L or similar

Bolts

AISI 4135
A4-80

Bars

AISI 12L14, galvanised
AISI 316 L or similar

Strip insert

Open-Flex 1L: AISI 316 L or similar/VDF, PVDF
Open-Flex 2: AISI 316 L or similar/HDPE

Sealing sleeve and temperature range

EPDM (-20°C to 100°C)
NBR (-20°C to 80°C)
FPM/FKM (-20°C to 180°C)

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