DIAPHRAGMS
Diaphragms are hermetical seals between
two spaces with media and pressures which, typically, differ from each other.
Unlike piston and rod seals, there is no drag leakage at the contacting
surfaces, and the requirements to be met in terms of tolerances and surfaces are
lower.
Chemical resistance to aggressive
media, flexibility and long service life are major requirements made on
materials and the design of membranes. For perfect service, it is indispensable
that diaphragms design and selection of the respective compound be adapted
specifically to the particular application conditions.
- Good reverse bending strength
- Nearly universal chemical resistance
- Very good suitability for sterilization
- Temperature resistance –60°C to +200°C
- FDA-approved materials
- Freedom of design
- Homogeneous structure
- Metering devices for the pharmaceutical and food industries
- Pumps for the chemical industry
- Pumps for painting technology
- Pressure regulators
- Pharmaceutical valves
PTFE diaphragms are used in metering devices for the pharmaceutical and food
industries as well as in pumps of the chemical industry and in painting
technology.
Because of their outstanding physical and chemical properties PTFE diaphragms
are being used in constantly increasing fields of application. The lift of the
diaphragm is determined by its shape and design as well as the existing
effective diameters.
To reduce the risk of damage, the sandwich diaphragm technology is primarily
being used (principle of the double barrier, diaphragm technology with breakage
sensor). This enables early detection of malfunctions for planned execution of
timely repairs and appropriate corrective action which reduces production
downtimes significantly. In addition, this helps prevent contamination of the
media fluids to be pumped.
With multi-layered diaphragms and constant material thicknesses the actuating
forces are considerably lower than those of single-layered diaphragms.
In addition to stamped diaphragms, machined diaphragms are increasingly being
used. A major advantage over PTFE/elastomer composite diaphragms is the
homogeneous structure and freedom of design offered by these diaphragms.
To increase service life, specially treated PTFE films and films made from
modified PTFE are used.