Burkert 2300 Instructions De Service page 20

Warning!
for control function i – danger if control pressure fails!
For control function I control and resetting occur pneumatically.
If the pressure fails, no defined position is reached.
• To ensure a controlled restart, first pressurise the device with
control pressure, then switch on the medium.
20
english
Type 2300
Structure and Function
7.2.2. incoming flow under seat
Depending on the version, the valve is closed against the medium
flow with spring force (control function A, SFA) or with control
pressure (control function B or I, SFB or SFI).
As the medium pressure is under the control cone, this pressure
contributes to the opening of the valve.
Warning!
medium may be discharged if minimum control pressure is too
low or medium pressure too high!
If the minimum control pressure is too low for SFB and SFI or the
permitted medium pressure is exceeded, leaks may occur.
• Observe minimum control pressure
• Do not exceed medium pressure.
• See chapter entitled "Operating Conditions / Pressure Ranges"
SFA
Fig. 9: Flow inlet under seat
(Rest open/closed, closing against medium)
SFB / SFI