Burkert 8630 Instructions De Service page 91

Various control valves from the Bürkert range may be used in connection with the Top Control Continuous depending on the installation
conditions. Angle valves, diaphragm valves, including ball valves fitted with a control cone are suitable, as well as piston or rotary driven
pneumatic actuators.
Pneumatic piston actuators or rotary actuators may be used as actuators. Single acting and double acting actuators may be used in
combination with the Top Control.
Within a single action actuator a single chamber is filled and exhausted. The resulting pressure acts on a spring, which forces the piston
to move until the pressure difference between the piston and spring are equal.
Double chamber actuators posses 2 chambers, which supply the pressure to the piston. The filling of one chamber induces the emptying
of the other, as there is no spring within this design.
Valves characteristics:
Flat seat control valves
Slanted seat control valve
Types • 2700
• 2712
Characte- • flow over under the seat
ristics
• protected against water hammer
• straight flow direction
• high tightness through selfpositioning
packing box
Typical • water, steam and gas
medium
• alcohol, oil, fuel, hydraulic fluids
• brine, organic fluids, base
• solvent
90
Diaphragm valves
• 2730
• 2731
• 2731K
• fluid tightly isolated from the actuator and environtment
• no dead volume, self purging design
• direction of flow as required with minimal turbulence of
flow
• steam sterilizable
• CIP
• water hammer free
• removable diaphragm and actuator through mounted
housing
• neutral fluid and gas
• charged or aggressive fluids
• high purity or sterilised fluid
• high viscosity fluids
Ball valves
• 2652 (2 parts)
• 2655 (3 parts)
• possibility of internal scraping
• reduced dead volume
• low retention of deposits
• replaceable seat and seals through 3 parts ball
valve design
• neutral fluid and gas
• pure water
• low aggressive fluids
Operating instructions no. 800607