12.5.1 Siemens SKP actuators
The combination of actuator and valve provides the following functions:
- Safety shutoff valve (SKP15...)
- Safety shutoff valve with gas pressure governor / controller (SKP25..., SKP55..., and SKP75...)
The electrohydraulic SKP... actuators together with the valves are designed for use with gases of
gas families I...III and air. They are used primarily on gas-fired combustion plant. The actuators
open slowly and close rapidly. They can be combined with any of the above mentioned valve types
and nominal sizes. The actuator can be supplied with end switch (for indicating the fully closed
position).
The SKP25... operates as a constant pressure governor with a setpoint spring.
Its field of use are primarily forced draft gas burners
- with mechanical fuel / air ratio control
- with electronic fuel / air ratio control
The SKP55... operates as a differential pressure
governor. Its field of use are primarily
- combustion plant with combined heat recovery
systems
- plant where pressure conditions in the burner and
in the combustion chamber do not change in
proportion to load changes - burners with adjustable
fuel / air mixing devices in the burner head - plant
with negative pressure levels on the gas or air side.
The SKP75... operates as a ratio controller and
provides control of the gas pressure
depending on the pressure of the combustion air,
ensuring that the gas / air ratio remains
constant across the entire load range. Its field of use are primarily modulating forced draft gas
burners.
To prevent injury to persons, damage to property or the environment, the following warning notes
should be observed! Do not open, interfere with or modify the actuators!
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