Burkert Type 8681 - Manual (Page 13)

13
System Description
sysTeM desCripTiOn 5.
intended application area 5.1.
The Control Head Type 8681 has been designed for use as actuation of pneumatically operated process valves
and / or for recording the switching states of these.
general description 5.2.
The Control Head Type 8681 is used for actuating pneumatically operated process valves.
For process valve actuation, the control head can be equipped with up to three solenoid valves.
For the recording and feedback of the process valve switching positions to a higher-level control, the control head
has been equipped with a contactless position measuring system, which works with three discrete, adjustable
feedback signals (Teach-In Function).
The control head and the process valve are interconnected by an adapter. This produces an integrated, compact
and decentralized system of feedback, actuation and valve function. The following advantages over centralized
solutions working with valve clusters are achieved:
low installation expenditure •
easy start-up •
higher application-specific flexibility •
shorter switching times and less air consumption due to shorter distances between the pilot valve and the •
process valve.
Various pneumatic and electrical connection variants are available.
special features 5.3.
Special features of the Control Head Type 8681 include:
easy-to-clean design with IP65 / IP67 protection •
high cleaning agent compatibility •
use of high-quality materials •
modular structure •
restrictable R- and P-connections for all pilot valves (solenoid valves) •
integrated pressure-relief valve in the inside of the housing for discharging leakage air with connection into the •
common exhaust air connection
collected exhaust air of all valve locations into one common exhaust air connection (by default equipped with a •
silencer)
if equipped with several working connections: one integrated non-return valve per connection in the exhaust air •
duct as protection against faulty switching of the process valves due to return pressure
central, super-bright optical display showing the process valve switching positions and design-specific addi- •
tional information in three signal colors
english
Control Head Type 8681