Gemu 514 - 2 Construction and Function

514
16/28
Failure to observe these points will lead to
the following dangers:
- Failure of important valve / plant functions
- Failure of prescribed servicing and
maintenance methods
- Endangerment to persons due to electrical,
mechanical and chemical influences
- Endangerment to the environment by
leaking dangerous materials
2 Construction and function
The pneumatically operated 2/2 way valve
is a metal angle seat globe valve with a
straight through body and a low maintenan-
ce aluminium two stage actuator. The
actuator has an aluminium housing and is
controlled by two pistons working indepen-
dently of each other.
Function:
When control pressure (connection V) is
applied, the lower actuator piston strokes
100%. The stroke of the upper part (con-
nection R) of the actuator, however, can be
steplessly limited from 0% to 100% by
means of the stroke limiter (item 40) and
secured by the locking nut (item 41).
When a stroke limiter is used, the actuator
piston (item 39) moves against the stroke
limiter (item 40) and flow restriction is possi-
ble (connection R).
If the lower part of the actuator (connection
V) is under control pressure, the valve fully
opens, pushing the spindle (item 44)
upwards through the upper actuator piston.
The valve bodies are available in various
designs as shown on the data sheet. Diver-
se accessories are available, such as pilot
valves, limit switches and field bus connec-
tions.
The following control function is available:
Control function 1
(normally closed):
Valve resting position: closed by spring
force. For activation of the valve see above.
The valve spindle is sealed by a self-
adjusting gland packing providing low
maintenance and reliable valve spindle
sealing even after a long service life. The
wiper ring fitted in front of the gland packin
protects the seal against contamination and
damage.
Control
function
Connections
V R
1 Full stroke Reduced stroke
40
41
39
44
Connection R
Connection V
IMPORTANT
- The areas of responsibility, the monitoring
of the staff and their competence areas
should be defined precisely by the operator.
- Train staff with insufficient knowledge or, if
necessary, have them trained (by the
manufacturer / supplier on order by the
operator.).
- Ensure that all members of staff under-
stand the safety instructions.
- Keep within the technical data (operating
data) parameters for the valve! It is
available in the technical documentation
(data sheet etc.)
- Define the valve body, sealing material and
lining material, if applicable, according to
the medium. Check its suitability before
installation.
- Adhere to legal regulations!
g