Burkert Type 2712 - Manual (Page 8)

T
ECHNICAL
D
ATA
6 - 2712
english
Liquid and gaseous media that do not attack the housing and seal materials.
Control medium: instrument air, class 3 according to DIN ISO 8573-1
2/2-way piston controlled valve with control cone and flat-seat housing
Control function A
(closed by spring force in rest position)
Control function B
(open in rest position)
Drive unit material: PA (polyamide)
Housing material: stainless steel 316L
Seal materials: steel/steel (1.4571) or PTFE/steel
Media
NOTE The approved operating pressures and media temperatures are to be taken from the data
sheet or rating plate. With regard to the permissible seat leakage, the values given in DIN
EN 1349 are complied with, whereby for the steel/steel seal, leakage class IV and for the
PTFE/steel seal leakage class VI apply.
Construction of the control valve
Control medium Quality classes according to DIN ISO 8573-1
Dust content Class 5: Max. particle size 40 µm; max. particle density 10 mg/m 3
Water content Class 3: Max. pressure dew point -20 °C or min. 10 degrees below the
lowest operating temperature
Oil content Class 5: Max. 25 mg/m 3 in conjunction with Bürkert positioners
Class 3: Max. 1 mg/m 3 in conjunction with SIDE Control Type 8635
Note: Higher demands placed on the positioner must be observed!