the operation of the control valve used for the cooling system of the turbine FRAME 9E

2.  The raison of this presentation is to clarified the
role and the operation of the control valve used for
the cooling system of the turbine FRAME 9E
 The regulating valves used on gas turbines are
valves called Robertshaw brand thermostatic
valves type ° 1010

3. The advantage of the Robertshaw series-no. 1010 control valves is that
they can be functional without the need for external power.
These valves provide adjustment of the temperature of a liquid or gas
Temperature control is a self-operation.
The capillary tube installed on the valve allows its control it consists of a
pipe, a bellows and a copper probe
The probe contains a thermo sensitive liquid
The temperature variation increases the volume of the internal liquid of
the probe and via the capillary tube the bellows acts to exert pressure on
the membrane
This membrane acts on the axis of the valve and thus change its course
in a bidirectional way
Robertshaw valves offer the advantage of two-way temperature
adjustment
• direct: by the variation of the race via the crank
• Indirect: following the action of the membrane on the axis of the valve

4. movement of the bellows is countered by an adjustable spring this
regulator controls only in the temperature range indicated on the
nameplate ideally.
the setting should be located in the upper third of the temperature
range .
if the probe is damaging a crank control can be perform to not
stop operation of the valve

5. 1. seamless .
2.bellowscrank.
3.Protection against
overheating.
4. Trim the valve shaft.
5. Intermediate part.
6. robust cast iron
frame.
7. Copper probe.
8. Setpoint adjustment
knob .
9. Capillary tube.

6. Control valves are sized often smaller than the line size.
An actuator intervention doesn’t remove the role of valves in
the trial.
The control valve must be as close as possible to the measuring
point.
The probe must be installed vertically. special care must be
taken when installing the three-way control valve.

9. the control valve can be set to control the temperature by identifying the limits of the nominal
temperature range after placing the valve in service and it will take between 20-30 minutes for the
response to be stable.
to raise the temperature it’s necessary to turn the adjustment wheel to right.
To lower the temperature, turn the wheel to the left
the controller has a scale plate to indicate the position of the valve this function is useful for
resetting the setting.
when frequent changes are needed graduation are not in degrees of temperature manual position
the crank mechanism of the valve is provided for manual opening or closing of the control valve
set point F to G thermostatic on scale in this position, the control valves is in thermostatic mode of
temperature changes on the regulator bulb when the manual operation of the valves is desired or
tour operator needed when the cursor is on the mark of the highest or to scale as this would
damage regulator
EXAMPLE CASE after installation and adjustment of the valve vtr1 of the gas turbine frame 9E and
for any useful purpose we have raised the following points: corresponding to the oil temperature
set point of 50 ° with a base load of the gas turbine and an ambient temperature of 17 ° c spring
tension distance 24mm corresponding to the temperature set point of 50 ° auto valve position
open on cooler and open on bypass Manu valve position on auto and emergency stop in case the
capillary bulb bellows system loses its liquid at a position 3 to 4mm from the position of the valve.
valve stem 25 mm from the stuffing box to the coupling nut
note: these references are specific to the this example case used below and can not be taken as
references for the other gas turbine a which are totally different indeed the valve example some
turbine is 2/3 open on cooler and 1/3 open on bypass some other are different what explains its
additional warming compared between GAS TURBINE