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.

PRODUCT OFFERINGS

• 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

G-ST-P/S

• For various applications best suited for joints connecting non-metallic (plastics, GRP, PVC, PP< PE, PVDF, etc.) and steel flanges.

G-ST-P/KN

• For various applications best suited for partially coated flanges and heavy duty services.
• Also suitable for non load bearing flange joints

G-ST-P/OE

• Flexible design gasket with visible stainless steel insert.

G-ST-WEDGE RINGS

• Ideally suited for solving alignment problems during assembly or for filling large gaps in installation.

TEFMET GASKETS

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

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

 CLICK HERE to download the complete Kroll & Ziller catalog in pdf format.

 

Material Selections:

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)