Ventilation > Fittings > Reducers

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VENTILATION COMPONENTS

Chemical Resistance

UPVC

temperature limits for pumping media (depending on pressure)
from -5°C to +50°C
resistant
acids and lyes
non resistant
aromatic solvents, esters, ketones, chlorinated hydrocarbons

CPVC

temperature limits for pumping media (depending on pressure)
from -5°C to +100°C
resistant
acidic lyes, aliphatic solutions
non resistant
aromatic solvents, esters, ketones, chlorinated hydrocarbons

PP

temperature limits for pumping media (depending on pressure)
from -5°C to +80°C
resistant
acids, lyes and weak solvents
non resistant
oxidising solvents, halogens

PPs

temperature limits for pumping media (depending on pressure)
from -5°C to +80°C
resistant
acids, lyes and weak solvents
non resistant
oxidising solvents and acids, halogens

PE

temperature limits for pumping media (depending on pressure)
from -20°C to +70°C
resistant
acids, lyes and weak solvents
non resistant
oxidising solvents and acids, halogens

PP-el, PPs-el

temperature limits for pumping media (depending on pressure)
from -5°C to +70°C
resistant
acids, lyes and weak solvents
non resistant
oxidising solvents and acids, halogens

PVDF

temperature limits for pumping media (depending on pressure)
from -20°C to +120°C
resistant
organic acids, inorganic chemicals
non resistant
ketones, smoking sulphuric acid

VENTILATION COMPONENTS – JOINING

The attached Sleeves with PE, PP, PP-s, PP-s-el and PVDF materials should be joined with a circumferential weld joint on the sleeve. Joining by gluing the sleeve has proven to be efficient and suitable for small diameters of PVC material. With larger diameters, there is the danger that it can only be welded to a limited extent due to the internal production-related tension on the edges of the formed part. This is the reason why we recommend welding tests and consultation with our technical department. Please make sure there is sufficient torque with Flange joints including the correct screws and plain washers. Flange joints should be checked on a periodic basis and retightened wherever necessary. Please take thermal length elongation into account when installing both inside and outside of buildings. Avoid direct exposure to sunshine and other heat source factors. Any axial forces this causes may not be conducted into fittings. The dead weight of the fittings – in particular when equipping with drives or at large diameters – should not absorbed by the joined Pipeline components. Please provide the appropriate assembly situation for retightening the bearings, should it become necessary, with butterfly valves designed for them, with hand-adjusted flaps and for reading the flap opening on the graduated collar.

Skilled and qualified personnel should apply the opera-ting instructions of drive manufacturers and the relevant sets of rules to connecting the electrical and pneumatic drive elements. If the customer assembles the drive unit, please ensure that the fastening sleeve does not overload the shaft journal. Please follow the drive manufacturer’s assembly instructions. Modifying/rebuilding of Kwerk formed parts, fittings and components without authorisation jeopardises operating reliability and is not permitted. Take measures appropriate to your specific application of the electrically discharging Pipeline system to provide for equipotential bonding. We also recommend checking the leakage resistance on a regular basis, remembering that operating conditions might cause a change in the electrical properties of the materials over time. Refer to the ATEX sheet for more information.

Always comply with all safety instructions to prevent danger of accidents and because non-compliance with safety instructions can cause failures or destruction. Please follow the operating instructions of the drive manufacturers and relevant sets of rules if auxiliary ene-gy is used (electrical or pneumatic drives). Skilled and qualified personnel should carry out installation and the drives should be depressurised and deenergised before performing repair work. Take the appropriate safety precautions if existing line systems are repaired or modified and especially if the component parts are exposed to chemicals. Highly concentrated and aggressive chemical substances can develop, especially if there is a danger of condensate formation. Correct protective equipment must be worn and the rules for handling chemicals observed. Kwerk formed parts, fittings and accessories should not be modified or rebuilt without authorisation. Never operate the product in excess of the maximum application temperatures given (surroundings/media) and check the chemical resistance of the chosen mate-rial in each case. Always follow the rules for handling suctioned off media when cleaning Kwerk formed parts, fittings and accessories (wear protective clothing wherever necessary).