Clifford Springs Explains Springs

At Clifford Springs, we want all of our clients to understand as much as possible about the springs available to them, so they can make decisions that will improve their own products. And we’re always happy to chat in more details.  Just give us a call if you want to find out more. 

The most common sealing spring is the garter spring. Basically, they're an extension spring with the ends joined by several methods.  The spring applies a force around a rod, but none to the bore. As the seal and/or rod wears, the spring contracts and applies a reduced force. It’s generally straightforward to vary designs and sizes to suit applications. 

Helical (or Helicoil) springs are produced from flat tape and joined to create a working diameter. They operate by compression of the spring body, not by extension of the overall spring length. They apply forces to both seal lips for rod/bore type seals, and also axially where seals are operating in that orientation. Like garter springs, when the seal is new, and any associated hardware is at the maximum metal condition, the spring exerts a very high force. The limitation is the total amount of deflection available, so these are not suitable for high wear applications. It’s straightforward to vary their designs and sizes to suit applications. 

Meander/cantilever springs (V & U profile) can apply high forces to both sides of a seal. The point of application of the force can be very close to the actual seal lips. These springs give a greater deflection than helical springs, potentially allowing a longer seal life as wear occurs. Currently, these are usually supplied in 5 industry standard sizes (various material grades).  

Canted coil springs are an exceptional solution for spring energised seals.  The magic is in the very flat load curve. These fit inside seal jackets, applying force to both sides of the seal. However, the load at maximum compression is very close to the load at initial compression. As the seal wears the load remains relatively constant. The seal lips never need to be overloaded when new and continue to give consistent load as the seal wears. Using Canted Coil can increase seal life. Whilst these are commonly supplied in specific coiled body sizes, they can be designed to suit specific loads and deflections.  There's no need for compromise. Use them instead of traditional compression and disc springs. 

Want to know more?  Contact Clifford Springs:

Tel:         +44 (0) 1527 62876

Email:     graham.fowler@cliffordsprings.co.uk

Website:  www.cliffordsprings.com 

Published: 5th December 2023