ZKAK/V sealing element (valve)

coated with cellular rubber for power cables

The universal sealing system for cable ducts, cable service entries with
extended range of temperature -30°C to +45°C (short-term +70°C/4h).

Predestined in the field of power cables.

For duct ID Ø 40 - 300 mm.

For installations in running or standing water and

4 x usable.

General information: ZKAK/V sealing element

ZKAK/V sealing elements with a valve are reusable seals (Fibre Optics CT patent, registered under EP 17972224.3) with a cellular rubber coating, equivalent to the coating with swelling material (QAK/V-L), which has had undiminished success for many years on the market.

Application-specific requirements, such as installation under running or standing water, created the need for the new technology with cellular rubber.

The sealing element (valve) fulfils the requirements of the T-Com TS 0307/96
(Approval No. Wolf 2005-08-11 ADE 100 (valve)).

Wolf sealing elements provide the user with a durable, reliable seal in a temperature range
-30 °C to +45 °C (+70 °C for a short period of 4h).




Product description:

Sealing cushion materials:
The flat tube cushion is made of a five-layered aluminium laminate.
The high quality of both material and processing guarantees a very low diffusion/leak rate of ~ 0.73 mbarl / year and ensures a long service life.


The filling unit:
In order to be able to fill the sealing cushion several times (4 times), a patented metal air valve with a plastic-coated valve extension is connected to the sealing cushion by means of a heat-seal welding process.

The pressure is filled via a pressure hose, which is plugged onto the sealing cushion to fill the car valve. After the pressure has been filled, the valve is sealed pressure-tight with the valve cap.


Product features:

Tight against gas diffusion, dust, water (5 m water column) and chemical mixtures


The high-quality, robust aluminium laminate …

  • adapts flexibly to the sealing area, independently of
    cable diameter and configuration or contamination by dirt
  • ensures a long service life
  • is resistant to chemical mixtures pH2 to pH12, fuels etc.

Coated with cellular rubber product group WO 24.2 ZK-DBK ...

  • ensures tightness up to 0.5 bar/5 m water column immediately on contact with water
  • ensures tightness against gas diffusion (volatile halogenated hydrocarbons in soil air < 100 mbar)
  • for installations in running or standing water
  • allows quick, easy removal (< 2 min). No adhesion! Makes damage-free removal possible.

The patented car tyre valve construction …

  • is simply inflated with compressed air (CO2-free!)
  • makes on-site overpressure inflation technology simple
  • allows flexible adaptation of the inflated cushion to fit the surrounding space and
    prevents buckling of cables and ducts or changes in technical transmission properties.
  • facilitates quick removal of air after cable retrofitting, by using accessory vacuum pump 33 VMSP or by changing the valve insert
  • facilitates damage-free removal and re-installation

Installation videos

ZKAK/V sealing element product info:

Test certificates:
  • E-04.10_PB005_2005.pdfTotal leak rate/ Diffusion rate of sealing elements (valve) FO 04.10-PB 005/2005 (GEMTEC)564 KB
  • E-04.30_PB175_2011.pdfResistance of reusable sealing systems to chemicals, petrol, diesel and leak detector agents FO 04.30-PB 175/2011 (TÜV - Süd)482 KB
  • E-04.80_PB176_2011.pdfStorage life of reusable sealing elements with valve FO 04.80-PB 176/2011 (TÜV - Süd)494 KB
  • E-04.90_PB179_2011.pdfBatch type test of reusable sealing elements (new valve design) FO 04.90-PB 179/2011 (TÜV - Süd)403 KB
  • E-04.100_TC160_2011.pdfCable Sealing System FO 04.100-PB 160/2011 (TÜV - Süd)398 KB
  • E-04.110_PB178_2011.pdfAttenuation change in indoor and outdoor single-mode optical fibre cables due to lateral pressure FO 04.110-PB 178/2011 (TÜV - Süd)546 KB
  • E-FO15_10-PB31_2012.pdfCost effectiveness of MaxCell multiple duct systems 4016-3 FO FO15.10-PB 31/2012501 KB

Wolf GmbH

Zazenhäuser Straße 52
D - 70437 Stuttgart

Tel.:  +49 (0)711 87 39 41
Fax.: +49 (0)711 87 12 30

Email: Service(at)Wolf-Systems.com