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GEMÜ diaphragm valves

Durable solutions

  • Area of application and industrial sectors
  • Technical data

Diaphragm valve: Area of application and industrial sectors

As they are available with such a large number of body and seal materials, GEMÜ diaphragm valves are used successfully in many different applications. Use the product search function if you already know which body material you require. Otherwise, please refer to our guide based on areas of application:

Metal aseptic diaphragm valves for sterile processes
Single-use diaphragm valves for pharmaceutical processes
Metal industrial diaphragm valves for numerous applications
As a result of different diaphragm materials and due to the surface quality of the valve body being maintained down to 0.25 µm, GEMÜ valves can be used in numerous sterile applications. The EHEDG-certified GEMÜ sealing system ensures that there is hermetic separation between medium and actuator.Single-use diaphragm valves comprise a stainless steel actuator and a gamma-sterilizable diaphragm valve body. The PP body with TPE diaphragm fulfils the purity requirements of the pharmaceutical industry as per USP 85 and USP 788.GEMÜ metal diaphragm valves are available in a weir-type version and in a full bore version and, because they are insensitive to particulate media, they are suitable for numerous industrial processes. Coatings and plastic linings are optionally available.
Plastic diaphragm valves for the chemical industry and environmental systems, as well as other industries
Plastic diaphragm valves for sanitary/hygienic applications
Plastic diaphragm globe valves for microelectronics, chemical engineering and the pharmaceutical industry
Plastic GEMÜ diaphragm valves are suitable for use with both inert and corrosive media in a liquid or gaseous state. For these valves, all media-wetted parts are made of high-grade plastics and therefore possess high chemical resistance.For the GEMÜ plastic diaphragm valves manufactured under cleanroom conditions for sanitary/hygienic applications, all media-wetted parts and the housing are made of high-grade plastic (PFA/PTFE/PVDF/PP).Diaphragm globe valves from GEMÜ are available as 2/2-way valves and multi-port valve blocks. Body, actuator and diaphragm are manufactured from the high-performance plastics PTFE and PVDF. The valves are available for order as HPW (cleanroom manufacturing) or HPS (no cleanroom manufacturing).

Diaphragm valves: Valve type

The diaphragm valve is practically the all-rounder among the valves; it can be used for countless applications in all industrial sectors. One of its major advantages is that only two components come into contact with the working medium – the diaphragm and the valve body. In the closed position, the diaphragm is pressed onto the sealing weir of the valve body and can therefore shut off up to 10 bar operating pressure. The media wetted inner geometry is designed to keep flow turbulences as low as possible, and there is almost no opportunity for product deposits or sediment, which means that it is very easy to clean. The diaphragm valve is known for its "minimal deadleg" valve type. The EHEDG certified diaphragm sealing system makes it ideal for use in the food and beverage industries, as well as for the biotechnology and pharmaceutical industries. The large material selection also means that it is ideally suited for corrosive, abrasive or high viscosity media, which are often found in the chemical industry and environmental engineering, or in processing industries. It is also used in water treatment, whether as a simple process water for heating or cooling circuits, for the manufacture of drinking water or the production of ultra pure water for microelectronics or semiconductor production. In addition to the previously described conventional weir-type diaphragm valve, there is also a full bore diaphragm valve, which provides practically unhindered through flow in the open position. This makes it the ideal choice for highly abrasive media with a high solid matter content. Typical areas of application include mining, manufacture and processing of wood pulp, paper, granules, plaster, cement, etc.

For all the valve types specified, GEMÜ offers numerous customized accessories for automation and process optimization. Electr. position indicator, position and process controllers, sensor systems and measurement devices, are easily and quickly fitted, adjusted and integrated in the existing process control technology. 

Diaphragm valve: Technical data

OperationManual, pneumatic, motorized
ConnectionsUnion ends, clamps, flanges, flares, threaded sockets, threaded spigots, solvent cement sockets, solvent cement spigots, hose barbs, butt weld spigots 
Operating pressure0 – 10 bar
Body materialMetal: Stainless steel, cast iron, brass, SG iron, cast steel, hard or soft rubber lining
Plastic: ABS, PFA, PP, PVC, PVDF, inliner PP-H/outliner PP reinforced
Media temperature-20 - 150 °C
Nominal sizesDN 4 – 300