Kroll & Ziller Seals

Mercer Gasket & Shim is proud to offer Kroll and Ziller advanced sealing solutions. Our staff of experienced sealing and gasketing experts can help you to select the right seal for your requirements.  Keep reading to learn more about K&Z seals, or if you want assistance now send an RFQ or call customer support at 800-210-5000.

Kroll & Ziller Seals are designed with the highest level of operational reliability in mind. K&Z has a wide range of gaskets, each designed with specific applications in mind. They are the market leader of metal reinforced profiled elastomer seals which are manufactured to meet rigorous German water quality standards. Depending on your material selection these seals can withstand temperatures ranging from -30°C to 200°C.

K&Z has developed remarkably innovative sealing solutions and is the only manufacturer to offer a seal made of NBR-DOU-EL which is suitable for applications as diverse as drinking water as well as in sealing flange connections in supply lines for gas and liquid hydrocarbon transmission.

Kroll & Ziller provides superior and unique sealing solutions for:

• Rubber-steel seals for pipeline construction
• Seals for gas pipes and natural gas
• Manufacturer of seals for gas pipes made of NBR-DUO-EL
• Sealing technology for chemistry and petrochemistry
• Seal NBR-DUO-EL for use in contact with hydrogen
• Fire protection seals and gaskets for house connections
• Fire protection seals for high thermal loads 
• Certified seals for the food industry and technology
• Seals for GRP and plastic flanges for numerous areas of application
• Individual seals for plastic composite systems
• Seals for VCI container flanges
• Seals for apparatus and container construction

Here is a brief description of K & Z product lines:

Rubber-steel seals for pipeline construction

Kroll & Ziller’s rubber-steel flange gaskets serve as dependable solutions for creating secure seals in a wide range of pipeline construction applications. These gaskets are particularly well-suited where a reliable seal with minimal surface pressure is essential.

These gaskets feature a steel insert that is tightly bonded with an elastomeric material through vulcanization. This process ensures an exceptionally strong connection between the steel insert and the rubber coating, making them impervious to shifting, detachment, or blowouts even when subjected to the most demanding conditions.

The versatility of these seals allows them to be utilized in a variety of situations, contingent on the specific elastomer in use. They are compatible with various substances like water, steam, gas, air, acids, alkalis, and hydrocarbons, among others. Furthermore, they can operate effectively at temperatures of up to approximately 200 °C. Rubber-steel seals are employed as industrial seals and are compliant with TA Luft requirements. Their suitability for specific applications, including drinking water, gas, and food, depends on the chosen material and other pertinent criteria.

G-ST-P / ISO seals made of electrically insulating materials

G-ST-P/ISO seals excel in preventing corrosion, especially in scenarios where different flange materials are paired, such as steel and stainless-steel flanges. In such cases, electrochemical corrosion can occur, necessitating the electrical isolation of these materials to prevent the creation of a galvanic element. To address this concern, we employ the G-ST-P/ISO seal kit. While its structural design is in line with our G-ST-P/KN seal kit, it diverges in the choice of materials. Instead of steel or stainless steel, we use electrically insulating materials like PP/PE, UPGM 203, or EP GC 203. These insulating materials are combined with a sealing lip made from one of our elastomers. The seal kit also includes bolt insulation, comprising an insulating tube constructed from a coated glass fabric tube (Mylar/glass silk) and insulating washers made from EP GC 203.

Freely Dimensionable seal – Custom-made G-ST profile seals with open insert

Rubber and steel profile seals with an open insert offer an ideal solution for situations where a standardized seal is not suitable. Thanks to their innovative design principle, these profile seals can be customized to accommodate a wide range of diameters and geometries, perfectly tailored to meet the specific needs of each customer.

The profile seal comprises a flexible open insert that can be sized as needed, along with an internal rubber profile. Both the material for the insert and the rubber profile can be selected from our diverse material portfolio. Commonly requested insert materials include various types of stainless steel (1.4301, 1.4571) and steel.

These seals find frequent application in industries like plant and container construction, particularly for statically weak flange connections, non-standardized flange connections, and exceptionally large nominal widths (diameters exceeding 4,000 mm). They are also well-suited for plastic and GRP (Glass-Reinforced Plastic) flange connections.

G-ST Wedge Rings

The G-ST wedge rings are composed of two shells and a rubber seal, which also holds certification for use with drinking water. These rings serve the purpose of facilitating adjustments during assembly, allowing for the convenient correction of misalignments or excessive gaps between flange blades. The G-ST wedge ring offers a continuous adjustment range from 0° to 8°, enabling the modification of the pipeline’s route without the need for additional, intricate welding procedures.

For an optimal setup, the recommended combination involves using a G-ST wedge ring in conjunction with two G-ST seals.