Functional data Media Cold and warm water, water with glycol up to
max. 50% vol.
Medium temperature -10…120°C
Medium temperature note The allowed media temperature can be limited,
depending on the type of actuator. Limitations
can be found in the respective data sheets of
the actuators.
Closing pressure Δps 1400kPa
Differential pressure Δpmax 350kPa
Differential pressure note 200kPa for low-noise operation
Flow rate Bypass B – AB: 70% of kvs value
Flow characteristic Control path A – AB: equal percentage (VDI/
VDE 2178), optimised in the opening range,
Bypass B – AB: linear (VDI/VDE 2178)
Leakage rate Control path A – AB: Leakage rate A, air-bubbletight
(EN 12266-1), Bypass B – AB: Leakage
class I (EN 1349 and EN 60534-4) approx.
1…2% of the kvs value, with respect to the
largest value within the DN
Pipe connectors Internal thread according to ISO 7-1
Angle of rotation 90° (Operating range control path A – AB
15…90°, Bypass B – AB 15…70°)
Installation position Upright to horizontal (in relation to the stem)
Maintenance Maintenance-free
Materials Housing Brass body nickel-plated
Closing element Stainless steel
Stem Stainless steel
Stem seal O-ring EPDM
Valve seat PTFE, O-ring EPDM
Characterising disc TEFZEL
R3040-25-S4, R3050-40-S4,
R3050-58-S4: Stainless steel