OVERVIEW OF KROLL & ZILLER (K & Z)
The Ziller Holding Company was established in 1926 in Hilden Germany, near Dusseldorf by Dr. Hans Ziller. The holding group consists of Nilos Ring, Nilos Belting, Kroll & Ziller Gaskets and Coal Control.
Kroll & Ziller is the market leader in the Rubber – Steel Gaskets market
- Kroll & Ziller flange gaskets are made of elastomer materials with a steel insert.
- The K & Z Rubber–Steel flange gaskets and adjustable Wedge Rings have been proven in use over many years and in all areas of pipeline construction.
- Several top steel mills, power plants, petrochemical industries, pharmaceutical industries as well as gas and water companies are long-time users of K & Z’s sealing products.
K & Z is built on the following tenets:
- Environmentally Safe Gaskets – approved by independent bodies.
- Operating Reliability – minimizes daily problems of the maintenance staff and fitters.
- Standardization – allows for a substantive reduction of variety and inventory.
- Easy Handling – minimizes daily problems of the maintenance staff and fitters.
- Cost Effective Logistics – minimizes problems for procurement managers and buyers.
- G-ST and G-ST-P/S profile flange gaskets made of elastomer materials with steel insert.
- G-ST Wedge Rings (infinitely variable from 0 to 8 degrees)
- TEFMET PTFE flat gaskets
- Kammprofile gaskets
THE KROLL & ZILLER GASKETS GUARANTEE
- High efficiency due to reduced operating costs.
- Reduced fugitive emissions.
- Ease of installation is attributed to the rigid steel core.
- The policy of Kroll-Ziller over the last 15 years has been specialization, research and development in close collaboration with a large number of customers.
COMBINATION OF FACTORS WHY KROLL & ZILLER G-ST GASKETS ARE IDEAL
- Vulcanization provides an extremely good adhesion between the steel insert and the rubber sheath ensuring separations and blowouts are not possible.
- Optimum handling during installation due to the rigid steel core.
- Ring style gasket ensures self centering on the bolt circle.
THE NEW GENERATION OF SEALING
- The O – Ring is the most static sealing element.
- The performance is perfect even without a cost intensive groove.
- The rigid body of the profile G-ST gaskets absorbs high surface pressures.
- Offers a degree of operating reliability.
- Offers advantages like wide sealing surface area and rectangular instead of round cross section near the O-Ring.
BENEFITS LINKED TO G-ST-P GASKET APPLICATIONS
- Sealing under minimum bolt tightening
- Compensation of surface imperfections
- Flange and bolt designs can be more lightweight
- Higher durability of plastic flange joints
- Angle differences are more easily compensated compared to simple flat gaskets
- Expensive machining of an O-ring groove on the flange is unnecessary
TYPES OF FLANGE GASKETS & USES
G-ST Flange Gaskets
- Flat rubber/steel gaskets
- For various applications best suited for joints connecting non-metallic (plastics, GRP, PVC, PP< PE, PVDF, etc.) and steel flanges.
- For various applications best suited for partially coated flanges and heavy duty services.
- Also suitable for non load bearing flange joints
- Flexible design gasket with visible stainless steel insert.
- Ideally suited for solving alignment problems during assembly or for filling large gaps in installation.
TEFMET gaskets are made of Polytetrafluoroethylene PTFE with a perforated stainless steel insert
- Have a high chemical resistance.
- For pressures up to 400 psi. (25 bar)
- Temperature range from 212F to 446F (100C to 230C)
- Made from Dyneon TFM 1600 with AISI 304 SS (1.4301)
- Resistant to nearly every media within the entire temperature range
- Minimal creep and cold flow characteristic even at high pressure and temperature because of the perforated SS insert
- gas tight
- simple and safe assembly
- blow-out safe due to SS insert
Kammprofile gaskets are available in a large number of alloys and soft facing materials.
- Thrust ring with kammprofile on both sides, graduation 1 mm / .04 inch with fixed centering ring and rated breaking zone. For flanges with flat or raised face.
- standard design
- slim design
- Thrust ring with kammprofile on both sides, graduation 1 mm / .04 inch with loose centering ring. For flanges with flat face.
- The separation of thrust ring and centering ring assures a high safety during operation, also under extreme conditions (no sudden breakdown caused by vibration failure or thermal stress)
- Thrust ring with kammprofile on both sides,graduation 1 mm / .04 inch without centering ring.
- For flanges with tongue / groove or groove / groove facings.*
KAMMPROFILE PROPERTIES AND APPLICATIONS
Excellent temperature resistance.
- Usage at high pressure possible. Full utilization of bolt forces recommended.
- Very good resistance against nearly all kind of media, especially against corrosives.
- Heavy duty, reinforced and blow-out safe gaskets with high operation reliability.
- Very low leakage rates with gases and liquids. Fulfills high sealing requirements.
- No aging and embrittlement even at high temperatures.
- Asbestos-free, completely harmless to health. Can be reused after re-lamination.
- Very good handling at transport, installation and deinstallation. Solid state design.
- No destruction through bolt overload. Marking of each gasket on centering ring.
- Usage of low chloride graphite layers and adhesive allows usage in systems made of austenitic steel.
- Are well established in chemical and petrochemical industries; in conventional and nuclear power plants.
KROLL & ZILLER PDF Catalog
Kroll & Ziller’s G-ST line comes in a variety of materials to suit almost any need.
- FPM-S – Temp. tmax. -4 to +392 degrees F, Shore -A-hardness 80 (+/-5)
- EPDM – Temp. tmax. -22 to +248 degrees F, Shore -A-hardness 70 (+/-5), FDA Approved
- NBR – Temp. tmax. -13 to +158 degrees F, Shore -A-hardness 80 (+/-5), FDA Approved
- HNBR – Temp. tmax. -4 to +302 degrees F, Shore -A-hardness 75 (+/-5)
- CSM – Temp. tmax. -4 to +248 degrees F, Shore -A-hardness 70 (+/-5)
- NR – Temp. tmax. -13 to +158 degrees F, Shore -A-hardness 60 (+/-5
- IIR – Temp. tmax. -13 to +248 degrees F, Shore -A-hardness 55 (+/-5)
- CR – Temp. tmax. -13 to +203 degrees F, Shore -A-hardness 63 (+/-5)