Wipers

Wipers may be used to prevent the crystallisation of media onto the glass and to remove dust and dirt.

SERIES W / WD / WDT / WR / WDR centrally operated wipers are mounted through the sightglass disc on either DIN 28120 (DN 50 - 200), DIN 11851 (DN 40 - 125) or similar sightglasses. The materials of construction are stainless steel with either a silicon rubber or PTFE wiper blade. The glass discs are available in sodium silicate to DIN 8902 and in borosilicate to DIN 7080. The maximum allowed temperatures are 180°C with wiper blade from silicone and 200°C with wiper blade from PTFE. Due to the central hole in the glass disc, they are not suitable for higher pressure applications, but are capable of operating under vacuum.

Series W = Version with one wiper-blade, manipulation by handling arm and ratch

Series WD = Version with double wiper-blade, manipulation by handling arm and ratch

Series WDT = Version with double wiper-blade, manipulation by T handle

Series WR = Version with one wiper-blade, manipulation by knob

Series WDR =Version with double wiper-blade, manipulation by knob

SERIES WS sideways operated wipers are mounted through the sightglass flanges of DIN 28120 type sightglasses in the range of DN 100 to DN 200. The maximum allowed pressure is 16 bar. Materials of construction are stainless steel with the wiper blades of PTFE or silicone rubber.

SPECIAL VERSIONS:

- Special O-ring seals

- Version in Hastelloy C4

- Larger dimensions (up to DN 400)