Claw clamp for CV and Rapid dn70, for SML/KML plain end cast iron 402070

Protection of socketless pipes against longitudinal forces

In sewage installations using socketless cast iron pipes (SML/KML systems), it is crucial not only to ensure a leak-proof connection but also resistance to forces acting along the pipe axis. The DN 70 claw clamp is an element that solves the problem of pipe displacement in critical locations. Thanks to specially designed "claws" that bite into the cast iron surface during tightening, the connection gains additional stability. This is not mere clamping – the mechanism locks the pipe to prevent it from pulling out of the fitting under the influence of pressure or liquid movement.

Where and why to use claw clamps?

The application of this type of clamp is not accidental. The manufacturer clearly indicates situations where standard clamps may not suffice. If turbulence occurs in the liquid stream – e.g., in bends, tees, or other changes in flow direction – these forces can lead to system leakage. The claw clamp prevents this phenomenon by ensuring the rigidity of the connection.

It is worth noting several specific installation scenarios:

• High pressure: In locations where pressure may exceed 0.5 bar (e.g., in sewage pumping stations), simple reliance on the smoothness of the pipe is insufficient.
• Backflow phenomenon: In backwater surge zones, where a sudden increase in backpressure occurs, the claws effectively lock the pipe movement.
• Axial forces: The design allows for the transfer of longitudinal forces up to 3 bar, making it one of the most efficient solutions in this product class on the market.

Versatility and installation efficiency

This solution stands out not only for its strength parameters but also for its versatility of application and ease of handling. The clamp has been designed as a two-piece (combined) element, which facilitates installation on existing systems without the need to dismantle pipes. It is compatible with various types of couplings:

• Single-bolt (CV type).
• Double-bolt (Rapid type).

As a result, the installer does not need to order different types of clamps for different sections of the installation – one DN 70 model covers the needs of most standard connections in the SML/KML system.

Practical application and operational benefits

By choosing RSP claw clamps for socketless cast iron pipes, you gain certainty regarding the durability of the connection in difficult operating conditions:

• Biting claws increase friction and pipe locking, preventing it from being pushed out under the influence of flow – this is crucial during dynamic changes in the stream.
• Resistance to axial forces allows for safe operation in pressurized systems and during hydraulic phenomena such as water hammer or backflow.
• Universal mounting fits both single- and double-bolt couplings, simplifying site logistics and reducing the number of required stock items.
• Protection against backflow is essential in backwater surge areas and during sewage pumping, where the risk of leakage is highest.

Installing the clamp only requires standard tightening of the bolts with an Allen or flat wrench – the claws automatically embed themselves into the cast iron at the appropriate tightening torque, creating a permanent mechanical connection without the risk of damaging the pipe itself (thanks to the appropriate claw profile). This simple technical solution eliminates the risk of failure resulting from the shifting of sewage installation components.