Burkert Type 2002 - Manual (Page 23)

23
Assembly
9. start-up
• Observe the type label specifications and information on
pressure and temperature values in section “7. Technical
Data”.
• Observe the information on the Ex area in section 3.1!
9.1. control pressure
Warning!
for control function i – danger if control pressure fails!
If the pressure fails, no defined position is reached.
• For a controlled restart, initially pressurize the equipment with
control pressure and then connect the medium.
→
Set the control pressure according to the type label specifica-
tions, see section “7.4” and flow direction (section “9.2” and
“9.3”).
9.2. flow direction above the seat
Control function A, CFA: closes by spring force with the medium flow.
The medium pressure supports the closure and seal of the valve seat.
The valve is opened by the control pressure.
Warning!
risk of injury due to water hammer!
A closing shock can cause lines and the equipment to burst.
• Only use valves with the flow direction above the seat for gas-
eous media.
To ensure complete opening, the minimum control pressure
must be used!
Observe the information on the Ex area in section 3.1!
9.3. flow direction below the seat
Control function A, CFA: closes by spring force against the medium flow.
Control function B, CFB: closes with the control pressure against the
medium flow. The medium pressure supports the opening of the valve.
CFA/CFI CFB/CFI
Flow direction below the seat
(closing against the medium) Flow direction above the seat
(closing with the medium)
CFA
Fig. 23: Flow direction above/below the seat
Warning!
seat leaks caused by the minimum control pressure being too
low (on cfB and cfi) or the medium pressure being too high!
• Observe the minimum control pressure and medium pressure
(see „5.5.1. Pressure ranges“).
english
Type 2000/2002