The incorrect loading and unloading
of pipeline inspection gauge (PIG)
launchers and receivers can have
catastrophic consequences. A specific
sequence of valves must be operated,
pressurising and depressurising the
PIG chamber in the same order every
time to avoid damage to equipment
and injury to personnel. To protect
this process, Smith Flow Control
offers a full line of key interlocks.

The interlocks are single or dualkeyed
mechanical locking devices
used to control the sequence in which
process equipment may be operated.

Using a ‘key transfer’ principal,
operational control over safety-critical
processes can be ensured.

SFC interlocks are constructed of
stainless steel and lubricated for life.

Each interlock is quickly installed on
any standard sized valve or associated
equipment with no modifications