Group C1 – Custom-designed Hydraulic Power Units for Škoda Power and its Subsuppliers:

Distinctiveness:

complex supply of hydraulics mostly – hydraulic power unit, servo-actuators, working fluid, pipe-lines, commissioning and training;
taking into account the equipment sophistication (danger of large damages and financial losses) it is necessary to implement a lot of specific demands – see below;
connection of electric items to terminal box mostly (especially on hydraulic power units) or by means of connectors Harting (on servo-actuators);
longer time schedule of particular job orders, similarity of hydraulic systems;
job orders implemented worldwide in years 2007-2008 – India, Pakistan, Finland, Denmark, Croatia, Germany and Russia, also lubrication and cooling systems in Romania, Chile, Turkey, Latvia.

Main strong points - advantages:

interesting price level, flexibility and adaptation by meeting the extremely high requirements set by branch and customer contrary to the dominant competitor Rexroth company especially as for turbines with lower output;
making use of high technical erudition – see description of typical demands;
effort to constantly improve and modify technical solutions unlike the opposite tendency to supply routinely.

Group C1 – Definition of the Basic Standards (Requirements) for Hydraulic Systems

Hydraulic power unit – most frequent requirements:

stainless steel reservoir with oil sump, enclosure of hydraulic power unit (noise and dirt);
redundancy of pressure source, accumulators with pressure fluid reserve for 3-4 cycles of servo- actuators;
multiple monitoring of working parameters of fluid (temperature, level, pressure);
utilization of synthetic, fire-resistant and biodegradable hydraulic fluid;
off-line unit for filling with working fluid, in special cases for fluid regeneration during operation.

Servo-actuators – most frequent requirements:

dividing into 2 types of main function – stop valves and control valves actuators;
the main demand for stop valve actuators is short closing time – up to 200 ms with controlled reach the end position, safe position ensured by springs, redundancy of safety function, control by seat valves;
control pressure for stop valve actuators with the “function 2/3” – disconnection of at least two out of three electromagnets will ensure fast close of steam at the inlet of turbine;
servo-valves connected in the way that operational safety is increased;
adequate filtration without by-pass;
continual position monitoring in multiple (redundant) design.