Tag Archives: zava

Sealing Solutions for Large Diameter Rotating Shafts: ZAVA V-Rings

First, What is a V-Ring?

The function of a V-Ring seal, or V-Ring, is to act as a centrifugal seal acting against the bearing face, pushing dirt and contaminants away from the bearing area.  V-Rings are not designed to seal against fluids or pressure differentials. However, as stated above, they are excellent at excluding all sorts of contaminants. They provide effective protection against loss and maintenance, reduce wear, increase the life of the retainer and bearings, and also work well in dry running applications.

V-Ring Applications

picture of zava seal v-ring
The most innovative V-Ring on the market: The Zava Seal with a quick-lock mechanism.

V-Rings are suitable for a whole range of sealing applications as well as rotary shaft applications such as electric motors, pumps, and agricultural machinery. This type of seal has proved to be reliable and effective against penetrating impurities such as dirt, sand, dust, greases, and splashes of water & oil in a variety of industries:

  • Pulp and paper
  • Steel mills
  • Cement mills
  • Mining
  • Rolling mills
  • Power generation
  • Fluid power
  • Chemicals
  • Food & Drink

How Do V-Rings Work?

V-Rings are flexible rubber seals that work by stretching and fitting onto a shaft and then rotating with the shaft against a counter face. They are designed to give the lips an automatic sealing action. They help to increase the sealing area by providing secondary sealing as pressure acting on the platform ring.

The Split V-Ring with ZAVA Quick-Lock

The V-Ring from ZAVA® Seal has a unique patented quick-lock that can be assembled quickly and easily, and in some cases can be installed without shutting down the filter. Because it’s mounted without vulcanizing, machinery downtime is significantly reduced. When “snapped in place,” the locking technology makes it impossible to detach. The quick-lock mechanism is made of acid-proof steel (SS 2343).  The split V-Ring from Zava can be made in many different lengths and cross sections and also in several different types of materials, specifications, and profiles.

Advantages of the Split V-Ring With ZAVA Quick-Lock

  1. Split and lockable
  2. Fast and easy to assemble
  3. Unique and patented quick-lock
  4. Elastic and workable
  5. Reduction in fiber loss
  6. Maximum leakage reduction
  7. No wear of the shaft
  8. A variety of different sizes

How Does the Quick-Lock Work?


For more information about the Zava Seal and to see if it might be the right fit for your application, contact Gallagher’s Engineering Department today.

Gallagher Fluid Seals is an authorized distributor of Zava Seal.

What is the ZAVA® Seal-Ring

Here Comes the ZAVA® Seal-Ring

“At last” – that’s the reaction of those who have been plagued by the constant need to change rubber seals on VFA and CCA filters at pulp plants all over the world. As an electrician at SCA Pulp in Sundsvall, Frans Sramek is the man that has solved this well-known, and seemingly hopeless problem. The ZAVA seal can be mounted in minute and cuts maintenance costs substantially.

“It’s always a pleasure to be able to offer our customers products on which they make money,” says Lars Bylund, Customer Service Division at Sunds Defibrator.

Four hours work in one minute

One of ZAVA® Seal-Ring’s prominent features is ease of installation. The rubber ring is locked in place using a quick-connect coupling, which is impossible to separate once it has been assembled. The designer is reluctant to say more. Patent protection is important.

As far as maintenance is concerned, vulcanizing is just a memory. The seal-ring is changed easily in less than a minute, without shutting down the filter. It’s an undertaking that would otherwise take three to four hours. The time saved is a strong argument for the ZAVA seal-ring, but not the strongest.

picture of zava seal-ring

The rubber composition withstands anything

No one would go out on a limb and claim that any material, exposed to all the chemicals present in a pulp plant, is maintenance-free. But the ZAVA® Seal-Ring is at least giving the maintenance people at Östrand cause to wonder.

For almost six months, the ZAVA® Seal-Ring has been tested on the plant’s filters without  sign of loosening or brittleness which are otherwise normal phenomena. The same thing is being experienced at MoDo in Husum.

“The rubber composition seems impervious to both acid and alkali environments of normal concentration,” says Sven-Erik Sundin, spare parts sales engineer at Sunds Defibrator, who has witnessed several less successful approaches to the problem.

Frans Sramek developed the rubber composition with the help of a good friend in the tire industry. If anything, the formula is an even bigger secret than the construction of the mounting device.

An end to mess and waste

An improved work environment is one of the main reasons why the ZAVA® Seal-Ring has won the approval of mill maintenance and operating personnel.

Previously, replacement of a leaking seal-ring was postponed until a normal production stop or periodic maintenance. As a result, it became increasingly difficult to keep machine areas clean as leakage increased.

So far, the ZAVA® Seal-Ring has proved to be completely tight. This also means that losses of black liquor and other chemicals have been minimized.

ZAVA® Seal-Ring creates new filter designs

Sunds Defibrator’s design people have become infatuated with the ZAVA® Seal-Ring. One idea being tested is to eliminate the inner seal-ring (V seal-ring) on VFA and CCA filters. This will result in a further reduction of maintenance since the seal cover would not have to be separated.

It can become a reality if the ZAVA® Seal-Ring proves that it can withstand the stresses. Åke Sundström, head of filter design at Sunds Defibrator says: ”We believe that, at last, we can avoid the troublesome V seal-rings on the covers. With a few minor design changes, an externally mounted ZAVA seal-ring should handle the entire job.”

Industry Application

ZAVA® Seal-Rings are available for many industries and in a number of materials and profiles. Industries like:

  • Chemical Processing
  • Energy, Oil & Gas
  • Heavy Equipment
  • Maritime Sealing
  • Pulp & Paper
  • Hydro Electric
  • …and more

Check out their video below:


For more information about the Zava Seal-Ring, contact Gallagher Fluid Seals or find more information on ZAVA’s website.