KAN-therm Push spring

KAN-therm Push bending spring

A KAN-therm Push bending spring is a site tool for a controlled bend on KAN-therm Push and Push Platinum pipe. The external spring is slipped over the pipe and supports the wall while the turn is formed, so the pipe does not kink, ovalize or lose bore. Installers use it at manifold, radiator and fixture approaches and in recesses where the turn must stay tight without sacrificing flow. The wrong diameter, or a bend made over the knee, damages the pipe before the sliding sleeve is fitted, so the spring is matched to pipe size and pipe type.

Main types of KAN-therm Push bending spring

The product group is built around the external pipe-bending spring: a steel-wire coil with a free end or eye, pushed onto the section to be bent and removed once the radius is set. That layout suits exposed runs and pipes laid in screed, where the outside of the pipe is accessible.

Springs are selected separately for homogeneous PE-Xc and PE-RT Push pipe and for multilayer Push Platinum pipe (PE-Xc/Al/PE-HD). For polyethylene pipe the manufacturer sets a minimum bend radius of at least 5 outside diameters. For multilayer Platinum the same figure applies without a spring; with an external bending spring the allowable radius drops to about 3 outside diameters, because the aluminium layer holds shape but kinks easily if unsupported. A spring sold for PERTAL multilayer pipe in other KAN-therm ranges may share a nominal size, but it should not be substituted until the outside diameter of the Push pipe is checked.

Materials and construction

The working element is spring steel. Coil stiffness has to keep the wall from flattening, yet the spring must still slide off after the bend. A smooth or coated wire matters for the outer PE layer and the EVOH barrier: a scratch in the protective polyethylene exposes the diffusion layer. Pitch and inside diameter are sized to one outside diameter, so a “universal” spring spanning two neighbouring sizes usually holds the radius less reliably. Exact data depend on the version and should be checked on the product card.

Where the bending spring is used

The tool belongs on internal heating and plumbing installs with KAN-therm Push pipe in the approximate range 12–32 mm: underfloor circuits, radiator tails, hot and cold risers, and pipework leaving a manifold cabinet. In screed and chases it lets the run pass an embedment without an extra fitting. On exposed multilayer pipe it helps set the geometry of the turn, because that pipe keeps the shape it is given. Media other than cold water, hot water and heating should be confirmed with the system manufacturer.

How to choose a KAN-therm Push bending spring

The deciding dimension is the pipe outside diameter, not the fitting nominal size. A 14 mm, 18 mm, 25 mm or 32 mm spring should sit close without binding; 16 mm and 20 mm need a check that the pipe is actually Push and not a neighbouring system with a different wall. Next comes pipe type: homogeneous PE-Xc / PE-RT or multilayer Platinum. Bend slowly, with no open flame, and keep clear of the zone that will be expanded for the sliding sleeve. If the radius is still tighter than allowed with the spring in place, use a PPSU or brass Push elbow instead of forcing the pipe.

Price follows diameter, coil length and finish. A crew is usually better off ordering a set for the sizes on the job than buying a single spring on site.

Why order from Pipeline Systems of Ukraine

Pipeline Systems of Ukraine can match the spring with pipe, sliding sleeve and PPSU KAN-therm Push fittings so the diameters belong to one kit. We work with installers, designers and private buyers: trade and retail, availability confirmed on request, delivery across Ukraine. Supporting documents can be requested for a specific item. A specialist will check spring diameter against the site pipe before dispatch.

Send a request to confirm stock and price of the KAN-therm Push bending spring for your pipe diameter. We will suggest the matching Push install kit.

Popular sizes

• 14 mm — tails, underfloor loops, short turns at the manifold
• 16 mm — confirm the pipe is Push, not Press
• 18 mm — radiator branches and floor distribution
• 20 mm — only if the pipe outside diameter matches the spring
• 25 mm — runs to the manifold and riser take-offs
• 32 mm — distribution sections where a kink is expensive to remake

Send a request to confirm stock and price of the KAN-therm Push bending spring for your pipe diameter. We will suggest the matching Push install kit.

FAQ

How is an external spring different from bending the pipe by hand? The coil supports the wall all round and stops it collapsing inward. A hand bend without support more often leaves an oval and a micro-kink that cuts flow and can fail after pressure testing. On multilayer pipe the aluminium layer makes this especially unforgiving.

Can one spring bend both PE-Xc and Platinum? Only if the outside diameter matches and the coil sits without play. Allowable radius is not the same: for PE-Xc and PE-RT the manufacturer’s guide is at least 5 diameters, for Platinum with a spring about 3 diameters. After bending, check that the outer layer is intact.

How far from a Push fitting can the bend start? Do not run the bend into the zone that will be expanded for the sliding sleeve. The pipe end has to stay round, or the expanding head seats unevenly and the joint loses its designed seal. Take the straight length from the system installation manual.

What happens if the spring is one size too large? Play does not support the wall, so the kink forms much as it would with no tool. A smaller spring will not go on, or it will scratch the pipe. Spring size follows the pipe outside diameter, not the bore.

Is a spring needed if the change of direction is made with a fitting? The spring plays no part in the Push joint itself: that is expander, fitting and sliding sleeve. It is used on the run between fittings when direction changes without an extra elbow. On a large job that cuts the number of joints buried in screed.