Grooved Pipe Fittings: coupling and Locking Bolt Assembly Mechanism

I. Core Components and Functions

The sealing performance of grooved pipe fittings relies on the synergy of three key components:

1.Sealing Rubber Gasket‌
Installed in the pre-rolled groove on the pipe exterior, forming an initial sealing barrier through elastic deformation‌.

2.coupling‌
Encases the rubber gasket externally, applying mechanical pressure to ensure tight contact between the gasket and groove‌.

3.Locking Bolts‌
Pass through bolt holes on both coupling halves, exerting uniform tightening force via torque adjustment to secure the coupling and gasket‌.

   
II. Assembly Process

1.Groove Preparation and Gasket Installation‌
Pre-roll standardized grooves (depth and width compliant with specifications) at pipe ends.
Embed the rubber gasket into the groove, ensuring full contact without twisting‌.

2.Coupling Alignment‌
Wrap the split coupling around the gasket, aligning bolt holes on both coupling halves.
Ensure the coupling fully covers the groove area without misalignment‌.

3.Bolt Tightening‌
Insert two locking bolts and tighten symmetrically with a torque wrench (e.g., 25–30 N·m for DN100 fittings)‌.
Uniform bolt tightening prevents uneven pressure distribution and sealing failure.

   
III. Key Advantages   

1. Dynamic Sealing Enhancement‌: Increased internal pressure compresses the rubber gasket, improving sealing performance‌.

2. Vibration and Displacement Resistance‌: Flexible coupling design accommodates axial displacement (flexible joints) or angular deviations, ideal for high-vibration environments (e.g., mining pipelines).

3. Rapid Disassembly‌: Loosen bolts to remove couplings, enabling quick maintenance or component replacement‌.

   
IV. Common Applications

   
1. Fire Protection and Water Supply Systems‌: Used for flange transitions or segmented connections in pipes ≥DN50‌.

2. Industrial Pipelines‌: Suitable for chemical and mining industries with pressure fluctuations and vibrations.

   
Note‌: Locking bolts must match environmental conditions (e.g., stainless steel for corrosion resistance) and undergo regular torque checks to prevent loosening‌.