Samson 3349 Mounting And Operating Instructions page 12

Safety instructions and measures
WARNING
!
Crush hazard arising from moving parts.
The pneumatic control valves with Type 3271 and Type 3277 Actuator contain moving
parts (actuator and plug stem), which can injure hands or fingers if inserted into the
valve.
Î Do not insert hands or finger into the yoke while the air supply is connected to the
actuator.
Î Before working on the control valve, disconnect and lock the pneumatic air supply
as well as the control signal.
Î Do not impede the movement of the actuator and plug stem by inserting objects into
the yoke.
Î Before unblocking the actuator and plug stem after they have become blocked (e.g.
due to seizing up after remaining in the same position for a long time), release any
stored energy in the actuator (e.g. spring compression). See associated actuator
documentation.
Risk of personal injury due to preloaded springs.
Valves in combination with pneumatic actuators with preloaded springs are under ten-
sion. These control valves with SAMSON Type 3271 or Type 3277 Pneumatic Actuators
can be identified by the long bolts protruding from the bottom of the actuator.
Î Before starting any work on the actuator, relieve the compression from the preload-
ed springs (see associated actuator documentation).
Risk of personal injury due to residual process medium in the valve.
While working on the valve, residual medium can flow out of the valve and, depending
on its properties, cause personal injury, e.g. (chemical) burns.
Î If possible, drain the process medium from all the plant sections affected and the
valve.
Î Wear protective clothing, safety gloves, respiratory protection and eye protection.
Risk of personal injury due to pressurized components and process medium being
discharged.
Î Do not loosen the screw of the test connection while the valve is pressurized.
1-6 EB 8048-2 EN