HYDRAULICS & PNEUMATICS FEATURE Making a dependable connection Stainless steel push-in
connectors from Eisele are meeting the demands faced by a manufacturer of valves for the process industry
B
ased in Knittlingen in Baden-Württemberg, Kieselmann is a leading manufacturer
of stainless steel valves, automated valve manifolds and end-to-end systems for the processing industry. From this location, the company develops and produces all stainless steel components, but then assembles the pneumatic installations and air tubes either in the factory or at the customer’s facilities. Kieselmann is broken down into a number
of divisions: beverage pipelines, components and valve technology, plant construction, and special plant construction for the pharmaceutical industry and biotechnology. In addition to butterfly valves and ball
valves, the company also produces single- and double-seat valves for automated processes. Offering high operational reliability and low operating and maintenance costs, its pneumatically operated single- and double- seat valves are switched by means of an electronic control head, which controls and signals the diverse functions via pilot valves. The compact single-seat valves are used for
the universal shut-off of branched pipelines. There are three pneumatic drives to choose from, with power capacities for different applications. Retrofitting to a more powerful drive is possible without the use of adapters. The valve function is defined by the mounting direction of the drives, and can be changed at a later time. Kieselmann double-seat valves, developed in
accordance with the EHEDG criteria, are among the most modern leak-proof valves on the market and are used for the reliable separation of incompatible products in automated processing systems. When the valve is closed, two independent valve disks, with pressureless leakage draining, reliably prevent mixing of the media. The leakage chamber can be cleaned by raising the upper valve disk or lowering the bottom disk. In the event of a faulty seal, the process medium exits the valve without pressure.
PUSH-IN CONNECTORS Since 2015 the company has been using push-in connectors from Eisele for
the compressed air supply of the pneumatically operated valves. With these, the thread distance is said to be ideal for the electric control heads of the Kieselmann valves, due to the requirement for the installed compressed air tubes to have as few bends as possible, with no kinking. That is why Kieselmann equips its valves with straight threaded connectors with an outer or inner hex socket, double T-shaped connectors and swivel elbow threaded connectors from Series 17 of the Eisele INOXLINE. Manufactured from stainless steel, these
are suitable for use in wet areas of food and beverage, chemical and pharmaceutical production plants, and can be used both in a vacuum of -0.95 bar and at pressures up to 16 bar to provide a lasting seal with no leaks. This is made possible by the reliable design as well as the use of durable, high-quality, seal materials. 17A series connectors with two seals on the tube side are used for applications with higher pressure requirements. Single swivel connectors with throttle check valve are also used.
Kieselmann uses the Eisele single swivel connector with throttle check valve
The INOXLINE pneumatic connectors are easy to clean
FEATURES General purpose stainless steel connectors from Eisele enable fast connection and disconnection of compressed air tubes without the use of tools. The tube only has to be pushed to the stop in the release sleeve of the push-in connector and the patented collet inside the connector holds the tube in its position for a lasting, reliable, connection with no damage to the tube. The integrated O-ring of FKM (Viton) ensures a tight seal. The screw-in end for
mounting the push-in connector on the machine or process valve is sealed with an enclosed O-ring. Series 17 components allow the full flow rate inside the tube despite their compact design. Even if the components do not come into direct
contact with food or beverages, they can come into daily contact with splashing water as well as chemicals used for cleaning the systems. They have to withstand constant temperature changes and the effects of acids, alkaline solutions and cleaners without corroding. Such effects would result in leaks, failures and, consequently, contamination of the medium. According to the company, Series 17 of the
Eisele INOXLINE is the right choice for this requirement. The push-in connectors, with a release sleeve and one seal, and available in numerous versions, are manufactured from non-corrosive and acid-resistant stainless steel 1.4301/07, and are designed to fulfil stringent requirements with respect to cleaning and corrosion resistance. These also offer a temperature range from -20 to +120˚C. The more economically priced BASICLINE connectors are in nickel-plated brass and are suitable for applications with less corrosion protection requirements.
A RELIABLE SOLUTION In addition to this, Kieselmann uses elbow connectors and throttle valves from Eisele on the pneumatic valves; and due to their quality, not a single push-in connector has failed in operation so far. A valve installation often remains in operation
for up to 30 years, which means that accessory components such as pneumatic connectors also have to be designed for maximum durability. As such, plastic connectors have proven to be less than ideal for the company. With premium solid metal connectors from Eisele, this problem has been solved.
Eisele
www.eisele.eu/en/ DESIGN SOLUTIONS | OCTOBER 2019 47
Cold, heat, moisture, cleaning chemicals – Eisele stainless steel push-in connectors withstand corrosive ambient conditions
copyright: Kieselmann
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