中文版
Description
9907-1200 Current-to-Pressure Converter
The CPC-II (current to pressure converter, generation II) is an electrohydraulic pressure-regulating
valve control designed for use in positioning single-acting steam turbine valve servos. This CPC’s superb
accuracy and resolution make it ideal for steam turbine valve control and related turbine speed and load
control. The CPC accepts a 4–20 mA pressure demand signal and accurately controls oil pressure to
precisely position single-acting steam turbine governor-valves. Precise and stable steam valve control directly relates to improved steam turbine
speed and load control and reduced system mechanical wear.
The CPC’s redundancy features make it ideal for critical steam turbine applications,
where turbine up-time and availability are essential. This converter can be configured to
accept redundant pressure demand inputs, from one or two (redundant) controllers, and
vote the input to follow. Alternatively the CPC can be configured to accept signals from
both its internal oil pressure sensor and an external (redundant) oil pressure sensor, and
use the voted healthy signal.
The CPC’s robust design (strong actuator, corrosion-resistant material, single moving
rotary valve, and self-cleaning port design) makes it ideal for challenging applications
where dirty or contaminated oil may be present.
Optionally two controllers can be connected to a single CPC in a redundant Master/Slave
fashion to allow the turbine to continue to operate if either turbine control fails, or on-line
changes are desired. Designed for use in applications requiring full redundancy,
optionally two CPCs can be applied in a dual-redundant fashion, simplifying the entire
system and control wiring.
The CPC is an electrohydraulic pressure-regulating valve control that utilizes a very
accurate internal pressure sensor and PID controller to precisely control steam turbine
valves. The CPC consists of a valve-actuator assembly, pressure sensor, and electronic
driver module. The unit’s driver module accepts one (or two) 4–20 mA pressure setpoints
and compares these setpoints to the sensed oil pressure, to accurately control turbine
valve oil pressure.
The CPC controls oil pressure by porting supply-oil to its control-oil output port (turbine
valve control oil) or back to the system supply tank. This converter’s special PID
architecture allows it to perform very stable pressure control during normal conditions,
and respond in milliseconds to desired valve step changes during system or plant
transients. As a means of protecting the turbine, an internal valve-return-spring forces the
CPC to a failsafe position (port oil to drain) and safely close turbine control valves upon
any internal unit failure (electrical input power failure, pressure sensor failure, processor
failure, etc.).
Please contact Sunny sales@xiongbagk.cn for the best price.
➱ sales manager: Sunny
➱ email mailto: sales@xiongbagk.cn
➱ Skype/WeChat: 18059884797
➱ phone/Whatsapp: + 86 18059884797
➱ QQ: 3095989363
➱ Website:www.sauldcs.com
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