Grooved Pipe Fittings

Grooved Flexible Couplings

A grooved flexible coupling seats in the groove with a deliberate gap, so it allows limited angular deflection and axial movement between the joined pipes. This flexibility absorbs vibration, thermal expansion and small misalignment without stressing the line.

It is used at pump outlets, building expansion joints, sprinkler lines in seismic zones and long heating or cooling runs. Sizes 1″–12″ share the groove dimensions of rigid couplings, so both types can be combined in the same line.

1″ – 12″pipe size (product range)

Angularand axial movement allowance

GGG 40.3ductile iron housing

EPDMstandard gasket

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Main Applications

Fire and booster pump outlets
Lines crossing building expansion joints
Sprinkler risers in seismic zones
Hot water lines with thermal growth
Chiller and cooling tower connections
Assembly points with slight misalignment

Technical Data

Connection	Grooved, flexible (allows movement)
Size	1″ – 12″ (product range)
Movement	Angular deflection and axial allowance (by size)
Housing	Ductile iron GGG 40.3 (manufacturer data)
Gasket	EPDM, −34 °C … +150 °C (manufacturer catalogue)
Optional gasket	Silicone or nitrile (by model)
Bolts and nuts	Galvanized carbon steel (manufacturer data)
Working pressure	By model and pipe wall thickness
Deflection value	Varies by size; stated with the order

Material Options

Part	Flexible coupling
Housing	Ductile iron GGG 40.3, two pieces
Gasket	EPDM (standard); silicone or nitrile (by model)
Bolts and nuts	Galvanized carbon steel
Finish	Painted (by model)

Which material? On lines with flexible couplings the pipe does not support itself because of the movement allowance; plan hangers and anchors accordingly.

Advantages

Vibration Isolation

Less pump vibration passed into the line

Movement Allowance

Absorbs thermal growth and small shifts
Suitable at expansion joints

Assembly Tolerance

Minor misalignment is accepted

Works with Rigid Couplings

Same groove size, same line

Construction and Design Features

Two-piece housing seated in the groove with a gap
Inner profile leaving movement space between pipe ends
C-profile EPDM gasket
Galvanized bolts and nuts

Send the pump or line size and the expected movement; we will recommend a suitable flexible coupling.

How to Choose?

Locate the movement pointsMark pump outlets, expansion joints and seismic joints.
Select the sizeChoose the coupling by nominal pipe size.
Plan the supportsPlace hangers and anchors on both sides of the flexible coupling.
Match the gasket to the mediumOn hot water lines check the gasket temperature limit.