Quick couplings for safe and efficient hydraulic bolt tensioning

Bolt tensioning is a method of controlled tightening which applies load to a bolt by stretching it axially. Mechanical efforts to create torque are replaced with hydraulic ultra-high pressure. 

CEJN ultra high pressure couplings and nipples are standard products for these kinds of applications, our engineers have long experience and CEJN guarantee safe and high performing quality products. 

How does hydraulic bolt tensioning work?

Original state of bolt and nut before stretching.

The bolt tensioning tool is assembled onto the bolt to be tightened. The hydraulic coupling/hose is attached.

Hydraulic pressure is applied to the tensioner from a tensioning pump.

The nut is wound down against the joint force.

Pressure is released and the bolt remains with accurate load.

The hydraulic equipment is disconnected followed by removal of the tensioner.

State of bolt after stretching. The bolt behaves like a spring: when the pressure is released the bolt is under tension, creating the required clamping force across the joint.

Simplify simultaneous connections with series 116 T-connection

Series 116 T-connection has been developed for bolt tensioners and other types of applications that need serial or simultaneous connection. This means that you can replace the standardized porting block solution with a single component, Series 116 Y-connection, and thereby minimize the risk of leakage.

The T-connection is compact and, thanks to a modified seal, the valve in the nipple can handle dynamic load while disconnected without the risk of seal damage. This means that it is safe to have a disconnected nipple at the end of a serial connection and there is no need for extra components, such as plugged couplings. 

Another major advantage is that less time and money need be spent on assembly – as all assembly work, including leak testing, is performed by CEJN – the T-connection is ready to use on delivery, straight out of the box. Fewer article numbers and a single supplier result in a simplified ordering procedure and handling of deliveries.