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Our ECOTROL® valves (types 8C, 6N, and 6H), both pressure-balanced and non-pressure-balanced, can be used for almost all refinery media, such as oil, gasoline, diesel, LPG, and HC gases through to hydrogen, as well as hydrogen fluoride and acid gas (NACE), and are likewise suited for applications in which cavitation and flashing are present. Nominal widths are DN 15 (0.5″) - DN 600 (28″) and PN 16/40/100/160/250/400 (ANSI 150/300/600/900/1500/2500).
Standard materials include GS-C25/A216WCB. Special versions made from Hastelloy and Monel are available on request. Working temperatures range from -190 °C to +570 °C.

Our ECOTROL® valves (types 8C, 6N, and 6H), both pressure-balanced and non-pressure-balanced, can be used for almost all refinery media, such as oil, gasoline, diesel, LPG, and HC gases through to hydrogen, as well as hydrogen fluoride and acid gas (NACE), and are likewise suitable for applications in which cavitation and flashing occur. Nominal widths are DN 15 (0.5″) - DN 600 (28″) and PN 16/40/100/160/250/400 (ANSI 150/300/600/900/1500/2500).
Standard materials include GS-C25/A216WCB and stainless steel. Special versions made from Hastelloy and Monel are available on request. Working temperatures range from -190 °C to +570 °C.

Our ECOTROL® control valves are the ideal tool for handling a wide variety of control tasks in applications that involve oil and gas processing.

Control tasks are challenging. To this end, we can provide you with a complete set of valves, along with our smart positioner and pneumatic drives, from a single source. Reliable service and support are also available worldwide.

 

Roll Cooling
The cooling water control valves for the work rolls in the intermediate structures feature specially adapted characteristics to meet the ever-increasing requirements for strip quality. The periodically changing width and thickness of the rolling stock is accommodated for by the high-resolution characteristic. Cooling water control valves for the hot-strip roll stand improve strip quality and continually cool the work rolls.

Roll Bearings
ARCA bearing pressure control valves with modified characteristics are used to increase the service life of the roll bearings in the production line. These valves also provide for optimum bearing lubrication while pressure controllers at the ARCA drives, with assisting volume units, ensure quick response times.

Cooling water control valves used during uninterrupted operation of the mould for continuous casting must manage enormous volumes of water to ensure ideal temperature distribution. The chill plate and chill pipe are cooled by the ARCA cooling water control valve, whereby the coolant is routed through the moulds via integrated channels.
Heavy and large overflow valves for heavy-duty applications in steel mills are designed to be especially noise and cavitation inhibiting. The cvs value previously defined must not be reduced, however. Internally-developed throttle assemblies also help to divert extremely large quantities of water under high differential pressure between casting operations.

ARCA control valves with high cvs values and linear characteristics are used to realize a large range of cooling possibilities in the laminar cooling section. The valves subsequently cool the strips after having been rolled in the production line and guide them to the coil, where they are wound with precision.
Special add-on periphery and safety positioning of the ARCA drives safeguard emergency cooling.

The following is an example of a strip mill.

 

1. Cooling Water Control Valves (I, III, V)
Temperature control of secondary steam behind the steam-conditioning stations is assumed by cooling water control valves. The steam is then fed to the cooling chamber of the steam-conditioning control valve (series 8C, 6H, 180).

2. HP-LP Steam-Conditioning Station (II)
The HP-LP station supplies the plant with low-pressure steam to meet the power plant’s own requirements when the turbine is not running or turbine tap pressure is insufficient. ARCA steam-conditioning control valves, which minimize noise as far as possible for humans and the environment by using perforated plugs and seat rings with graduated control, provide ideal conditions for this. Steam pressure is reduced in the valve and cooled by injecting cooling water into the valve itself or its exit line with respect to the operating data (series 510 to 580).

3. HP-MP Steam-Conditioning Control Valves (IV)
The HP-MP station supplies the plant with medium-pressure steam to meet the power plant’s own requirements when the turbine is not running or turbine tap pressure is insufficient. Otherwise, the conditions that exist for the aforementioned valve apply here as well (series 510 to 580).

4. Bypass Station, Steam-Conditioning Control Valves (VI)
The bypass station takes up the excess live steam and typically channels it through a steam tube directly into the condenser if the emergency tripping mechanism for the turbine is actuated. Otherwise, the conditions that exist for the aforementioned valve apply here as well (series 560 to 580).

 

1. Live-Steam Control Valve
This valve is used to regulate the pressure with which live steam enters the turbine. Turbines for medium-sized thermal and industrial power plants require straight-way and angle-control valves (DN200 - DN500) with fast positioning times (series 6N, 6H, 350, 380).

2. Extraction Steam Control Valve
This valve can feed the MP steam mains to meet the power plant’s own requirements or regulate the pressure of process steam in industrial plants (e.g. paper mills) that frequently control multiple steam mains to supply a wide variety of heat exchangers. To this end, straight-way and angle-control valves (DN150 - DN500) with as large a cvs value as possible for low differential pressure and a stroke positioning time of under 5 seconds are essential to tap the turbine with minimum energy loss (series 6N, 6H, 350, 380).

3. Seal-Steam Control Valve
The HP, LP, and MP turbine shafts of steam turbines are axially sealed with respect to the turbine housing by using labyrinth seals near the shaft throughput. The seal-steam control mechanism must maintain a predetermined low level of overpressure at the shaft labyrinths, regardless of load changes in the turbine or condenser.

When the seal-steam pressure is too high, leakage steam from the shaft labyrinths can contact the bearing bodies via the oil-sealing rings and condense to water in the oil system. When the seal-steam pressure is too low, on the other hand, air can be taken in, which reduces vacuum pressure and further promotes the formation of condensate.

The seal-steam control mechanism is designed to feed steam to the labyrinth chamber and purge accumulating leakage steam, depending on the type of turbine and the way it operates.

Seal steam (typically live steam) is fed using the seal-steam control valve (DN15 - 100), which is often required to regulate in a very precise manner under high differential pressure (series 8C, 6H, 180).

4. Leakage-Steam Control Valve
The conditions that prevail for the aforementioned valve apply here as well. Leakage steam is purged using the leakage-steam control valve (DN50 - 200), whereby the steam is extracted into the condenser vacuum behind the valve (series 8C, 6N).

5. Seal-Steam Cooler
Live steam often has excessively high temperatures, especially at the shaft on the low-pressure side of industrial turbines. This can be counteracted with a mini cooler (DN65 - 150) or similar, however (series 595, 596).

6. Cooling Water Control Valve
Coolant (typically condensate) is fed to the cooler with this valve (DN15 - 50) to regulate temperature (series 8C, 6H, 120, 130, 180).

7. Drain Valve
All low points in the steam pipeline and turbine chambers must feed accumulated condensate to the condensate collector as the system warms up and during operation by way of a switching or control valve (DN15 - 50) (series 8C, 6H, 120, 130, 180).

8. Exhaust Steam Cooler
Exhaust steam from the turbine supplies the low-pressure steam mains (whose temperature is cooled by the exhaust cooler), depending on the type of turbine and the way it operates in industrial plants (series 590, 596, 597).