A new diaphragm with KTW approval has been developed by GEMÜ for use with drinking water. At the same time, the GEMÜ 675 weir type diaphragm valve with the new diaphragm has undergone DVGW testing and has been approved for use in drinking water applications.
The company developed a new diaphragm code 18 (EPDM) for drinking water applications and had it certified by the authorities in accordance with KTW recommendations 1.3.13 of the German Federal Health Office. In addition to the certification of the new diaphragm they also had certain versions of the GEMÜ 675 diaphragm valve certified by the DVGW.
Complying with the requirements of DIN 3546-1 (10/2002) and DVGW Work Sheet W 570-1 (4/2007) the valves have been certified in nominal sizes DN 25 – 100 , but nominal sizes DN 125 and DN 150 of the same version are also available. The temperature limits are 0C – 80C, the maximum permissible operating pressure is 10bar.
The valve bodies in nominal sizes DN 25 - 50 are in cast bronze, the pipe connection is a RP threaded socket to DIN EN 10226-1. Nominal sizes DN 65 – 150 are available with flanges to EN 1092, PN 16, form B, length EN 558 series 1 in GJL-250 (GG 25) material with an Epoxy coating with KTW (contact with drinking water) approval.