The general and technical information provided in this catalog is based on previous experience and merely represents recommendations for standard applications. For your specific application, our technical application consultants will be glad to assist you and work with you to develop a solution customized to your specific sealing requirements. The specified product data has been determined under technically ideal laboratory conditions. These limit values may be lower in certain applications due to their dependence on the operating parameters (e.g. applied pressure, operating temperature, media...

TABLE OF CONTENTS About us 4 3. Basic Diaphragm Shapes 9 4.1 Fabric Reinfoced Moulded Diaphragm 10 4.3 PTFE Composite Diaphragms 12 6. ULMAN Produktion GmbH & Co. KG 15

ABOUT US As an internationally active full-service provider for sealing technology, the ULMAN Group has more than 50 years of experience in the industry experience. With over 1,600 long-standing customers, we, ULMAN Dichtungs-technik GmbH, based in the Swabian town of Gartringen, are now one of the leading suppliers in Germany. In addition to our location in Gartringen with its management, sales, purchasing, technology, development, QA, logistics, marketing and human resources department, our group of companies also includes the company's own production facility ULMAN Produktion GmbH & Co. KG...

INNOVATIVE - HIGH QUALITY PRODUCTS - OPTIMAL SOLUTIONS - RELIABLE SERVICES -ALWAYS MEETING THE HIGHEST DEMANDS OF OUR CUSTOMERS Every day, we focus on our most important: CORPORATE VALUES: As a future-oriented company, our aim is to drive innovation. Our daily work consists of realizing innovative product solutions. Numerous product and material developments in our own test series and test facilities have already enabled ULMAN to boast many internationally patented developments. We are consistently committed to optimally meeting all sealing requirements. We accompany our customers throughout...

Elastomer moulded diaphragms are sealing elements which function as moving, resilient walls that hermetically separate two spaces from each other. The characteristic feature of diaphragms is their ability to perform a stroke motion in their mounting plane a stroke motion vertically to the flange retention. They are used to transform pneumatic or fluid pressure into mechanical power. Inversely, mechanical power can be used for volumetric displacement. Important for ideal function and service life is, that the diaphragm stroke always results from the change in shape of the diaphragm and not from...

Design of the diaphragm clamping areas: The multitude of diaphragm designs can be reduced to a few basic forms (Fig. 1). The application determines the size and shape of the diaphragms. In order to fix the diaphragm into the housing, it is clamped between two flanges in the clamping. Different diaphragm are used depending on the diaphragm design and the design of the diaphragm. Rolling Diaphragm Bead Moulded Diaphragm Disc-shaped Diaphragm Spherical Diaphragm Fig. 2 shows some examples of the optimum design of the clamping areas: Sealing bead: One flange is flat while the groove is fitted in...

4. DIAPHRAGMS 4.1 FABRIC REINFORCED MOULDED DIAPHRAGMS Elastomer diaphragms without a fabric reinforcement separate the media from each other and simultaneously take up the tensile stress resulting from the pressure load and kinematics. • Fabric insert: The fabric reinforcement is embedded in the centre layer of the cross-section. • Fabric overlay: The fabric reinforcement is applied to the surface of the pressureless side. A special technology in our production process enables us to guarantee the exact course of the fabric even in the transition radii. Applications with high pressure loads (greater...

4.2 RMG ROLLER-TYPE DIAPHRAGMS Roller-type diaphragms are highly flexible, thin-walled diaphragms with fabric reinforcement on the reverse side of the pressure. RMO roller-type diaphragms are also available in special designs without reinforcement fabric. As a result of the thin walls and the large diaphragm height in relation to the diameter the following advantages are given: • An almost constant inherent resistance • A large stroke length in relation to the diameter • An uniform active area over the entire stroke produce special geometries upon request. The application temperature range is...

4.3 PTFE COMPOSITE DIAPHRAGMS PTFE composite diaphragms are used wherever pure elastomer diaphragms reach their mechanical limits. In the chemical industry, in particular, the use of aggressive media places increased demands on the chemical resistance of the sealing element. The use of PTFE grades are recommended here. PTFE composite diaphragms consist of several components (Fig. 5): • Foil (PTFE) • Elastomer diaphragm (NBR, HNBR, EPDM, CR, SBR, FKM, VMQ, FVMQ) • Fabric insert (polyamide / HT polyamide) • Supporting plate (brass, aluminium, steel, stainless steel) Fabric layer Polyamide HT-Poyamide...

PTFE foil is chemically bonded to the elastomer diaphragm and forms a closed surface to the medium. This protects the elastomer material from aggressive environmental influences. The integrated support or clamping disc can be designed with either an external or internal thread. In this case, a fabric insert is used in which the fabric is embedded in the centre of the cross-section. Chemical resistance of the PTFE grades ranges from pH 0 to pH 14. In terms of physiological safety, the PTFE film fulfils the requirements of FDA 21CFR 177.1550 and is therefore suitable for use in the food sector....

When selecting a suitable material, each application must be checked for individual application parameters. Different material combinations are used depending on the requirements. Our technical support will be pleased to help you select the right material for your application. Below is a list of our standard grades for the respective material categories. Furthermore, we offer material qualities that comply with DVGW, KTW-BWGL, EN 16421 (ex.W270), WRAS, FDA, among others. Special qualities, such as electrically conductive elastomers, are available on request. The control of the chemical, mechanical...