19
Competence in Functional Safety
Functional safety of globe valves, rotary plug valves, ball valves and butterfly valves
6 Installation, piping and wiring Responsibility
6.1 Mechanical and pneumatic installation
During mechanical and pneumatic installation, the mounting and operating instructions
of the corresponding device must be observed.
The pneumatic connection must only be connected to instrument air networks that meet
the quality requirements in accordance with ISO 8573-1:2001, Class 3 or 4.
Operator
Compressed air quality according to ISO 8573-1
Particle size and quantity Oil content Pressure dew point
Class 4 Class 3 Class 3
≤ 5 μm and 1000/m³ ≤ 1 mg/m³ –20 °C or at least 10 K below the lowest ambient tem-
perature to be expected
The required minimum cross-sections of the supply air lines must be observed. Refer to
section 5.1 (General control valve requirements).
After mounting, the position of the filters or filter check valves on the valve accessories,
e.g. pilot valves, must be checked and, if necessary, corrected.
Example: Pilot-controlled Ex i solenoid valve (SAMSOMATIC)
The prescribed mounting position of the devices must be observed.
Booster valve ports not connected by pipe or hose must be protected properly against
dirt, water etc. from entering the device by using appropriate filters.
Operator
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