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  • General information
  • For sterile and hygienic applications
  • For abrasive and contaminated media
  • Replacement diaphragms

Top GEMÜ quality for all sterile and industrial applications

GEMÜ manufactures, installs and delivers diaphragms for full bore diaphragm valves and diaphragm valves with a sealing weir.

The following applies in relation to all original GEMÜ diaphragms:

  • Production and quality control in accordance with high GEMÜ standards
  • Special compound in accordance with original GEMÜ specifications and in-house development of the compound
  • Testing on our own test rigs, in accordance with the requirements of the pharmaceutical sector among others
  • Manufacture by the GEMÜ group or through certified suppliers with connections to GEMÜ going back many years

For sterile and hygienic applications: seal system

GEMÜ developed its seal system for diaphragm valves with a sealing weir up to DN100 over three decades ago. A circular sealing bead in the valve body creates a defined external sealing point. This minimizes the ring-shaped gap between the diaphragm and the valve body and makes this seal system particularly suitable for applications in the pharmaceutical, biotechnology and cosmetics industries.

Available materials: EPDM, PTFE (no industrial standard but improved composition)/EPDM; further materials depending on the scope of application

Traceability of GEMÜ diaphragms

GEMÜ diaphragms for diaphragm valves in the weir-type design can be ordered individually packed with an inspection certificate and thus traced. With our GEMÜ CONEXO system, we also offer captive identification – even after removal from the packaging or from the warehouse. This involves the relevant diaphragm being equipped with an RFID chip. IT infrastructure comprising a mobile and stationary software solution is also required. Thanks to serialisation, the components are uniquely traceable and can be identified in the plant at any time using an RFID reader.

For abrasive and contaminated media: Full bore diaphragm valves and lined diaphragm valves

The minimal deadleg internal contour and the support of the diaphragm by a compressor provides optimum flow conditions and the best seal properties on GEMÜ full bore diaphragm valves. Lined diaphragm valves from GEMÜ combined with a suitable seal material offer even better resistance to numerous lyes, acids and other corrosive, abrasive and contaminated media.

Available materials: NBR, CR, natural rubber and EPDM

Replacement diaphragms from GEMÜ

for aseptic and industrial processes

Diaphragms are wearing parts. They need to be regularly inspected and replaced otherwise malfunctions can occur, possibly resulting in hazardous situations.

Specifying the maintenance cycles

 The maintenance intervals for inspecting and replacing diaphragms are application-dependent. In order to determine a suitable maintenance interval, the maintenance history and the stresses placed on the parts due to frequent sterilisation, cleaning processes or frequent cycle duties must be taken into account. The type of media must also be considered; the maintenance interval is considerably shorter for viscous or abrasive working media in comparison to inert liquids, for example.


 If it has not yet been possible to conclusively document the maintenance interval, or if the diaphragm is only to be replaced in the event of leakage, we recommend creating a stockpile in order to be able to react promptly. However, the inventory should take into consideration that elastomer components have a maximum recommended storage and operating time. This is between one and six years for GEMÜ diaphragms – when they are stored correctly.

Procurement cycles

 In our experience, it is worth setting up a small storage area for small, frequently used parts and establishing a rolling order system at the same time in installations with a relatively large number of diaphragm valves. In the latter case, you will automatically receive a subsequent delivery or a further delivery of diaphragms from us in a time period defined by you.


 Replacement diaphragms can be ordered as loose items. For reasons of traceability and primarily for sterile and hygienic processes, we also offer you the option of ordering the diaphragms individually packed and labelled, along with the corresponding inspection certificates.

For metal aseptic diaphragm valves, we have created an appropriate table with order numbers for replacement diaphragms.

For metal industrial diaphragm valves and plastic diaphragm valves, as well as for ultra-pure plastic diaphragm valves, please get in touch with your contact person because there are considerably more types or, depending on the product, other versions available in this case.

GEMÜ diaphragms have been developed, tested, and approved for applications with GEMÜ valve bodies. Therefore GEMÜ do not recommend or guarantee the use of other manufacturers diaphragms with GEMÜ valve bodies. We shall not accept any liability resulting from the use of diaphragms of other manufacturers inside GEMÜ diaphragm valves.

GEMÜ Code 13
Code 13
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 14
Code 14
90 ° C
-10 ° C
max. 40 min; max. 130 °C
GEMÜ Code 17
Code 17
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 2
Code 2
100 ° C
-10 ° C
GEMÜ Code 36
Code 36
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 4
Code 4
90 ° C
-10 ° C
GEMÜ Code 4A
Code 4A
90 ° C
-10 ° C
GEMÜ Code 52
Code 52
6 bar
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 5A
Code 5A
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 5E
Code 5E
100 ° C
-10 ° C
max. 150 °C
GEMÜ Code 8
Code 8
100 ° C
-10 ° C