WOODWARD 9907-1106 Pressure Converter

WOODWARD 9907-1106 Pressure Converter

WOODWARD 9907-1106 belongs to the CPC-II series and is a current pressure converter specifically designed for steam turbine servo systems. Its core function is to convert electrical signals into precise pressure signals to control the steam turbine inlet valve. With high precision and reliability, it is widely used in multiple industrial scenarios that require strict pressure control. The following is its detailed information:

Core technical parameters

Specific indicators for parameter categories

The input voltage for electrical parameters is 18-32V DC, with a steady-state current of 1.5A and a peak current of 8A (for 100 milliseconds); Receive 4-20mA isolation current setting input with an input impedance of 250 ohms; Equipped with RS-232 serial port for communication with computer tool software to achieve parameter adjustment

Accuracy and stability: Full scale accuracy is less than ± 0.2%, with a repeatability of 0.1% of the full scale; Temperature drift is ≤± 0.01% of full scale/℃, pressure stability is ≤± 2% of the set value, which can effectively avoid the influence of environmental temperature changes and system fluctuations on pressure control

The weight is 25 kilograms and the dimensions are approximately 290 × 270 × 270 millimeters in the oil-free state of physics and protection; The shell is made of anodized aluminum material, with a protection level of IP56; It can be installed in any posture, and there are 4 M10 threaded holes with a depth of 23 millimeters at the front of the hydraulic end for fixing

The operating temperature range for environment and certification is -40 ℃ -+85 ℃, and the working temperature of hydraulic oil is also -40 ℃ -+85 ℃; Compliant with EU CE, ATEX and other certifications, suitable for Zone 2 hazardous environments, meeting industrial explosion-proof and electromagnetic compatibility standards

Hydraulic parameters are compatible with mineral oil or synthetic oil, with a maximum return pressure of 2 bar (29 psi). The internal key components are made of 440C stainless steel material, which can withstand dirt and oil stains without the need for additional filtering devices

Core performance characteristics

High reliability and adaptability to harsh working conditions: It has extremely strong resistance to oil pollution, and the internal large-diameter channel can reduce the risk of impurity blockage. Combined with the "dredging algorithm", it can automatically flush dirt. And the key components are made of corrosion-resistant stainless steel, which can operate stably even in environments with high oil pollution in industrial equipment, without the need for additional complex filtration maintenance.

Fast response and precise control: The scanning time is only 2.5 milliseconds, and the total response time is between 10-30 milliseconds. When facing system transient changes such as steam turbine load fluctuations, it can quickly respond to valve adjustment requirements, and with the help of PID controllers, it can accurately compare the pressure setting value with the actual oil pressure, ensuring stable control of steam turbine speed and load.

Safe design for failure: The base is equipped with a spiral reset spring, which is connected to the lower part of the control shaft. When abnormal situations such as power failure, pressure sensor failure, or processor failure occur, the reset spring will drive the internal valve back to the fully open bypass position, avoiding safety accidents caused by valve loss of control in the turbine.

Easy and efficient installation and maintenance: It can be installed through various brackets, and wiring can be connected through protective connectors or conduits. Opening the top cover can complete the wiring operation; Support dynamic adjustment of parameters through computer tool software, without the need for complex disassembly, and convenient maintenance and parameter optimization in the later stage.

Working principle

This equipment is a key component of the steam turbine valve servo system. During operation, it first receives a 4-20mA current control signal from the control system, which corresponds to the required valve opening of the steam turbine. Internally integrated high-precision pressure sensors and PID controllers will convert the received current signals into corresponding pressure settings, and then compare the real-time oil pressure data collected by the pressure sensors. By continuously correcting deviations through PID regulation algorithm, stable and proportional oil pressure is output to accurately control the opening of the steam turbine inlet valve. At the same time, monitor the electrical and hydraulic status of the system throughout the entire process. Once a fault occurs, immediately trigger the reset spring to perform a fail safe action, ensuring the safety of the turbine system.

Typical application scenarios

Power industry: mainly used for steam turbine inlet valve control in scenarios such as thermal power generation and waste heat power generation. By precisely adjusting the steam intake, the stability of the turbine speed is ensured, thereby maintaining the frequency and voltage of the generator's output power to meet the standards.

In the field of petrochemicals: hydraulic servo systems suitable for compressors, turbines, and other equipment in oil and gas extraction and pipeline transportation. By utilizing stable pressure control, these devices ensure stable load during continuous operation, avoiding pressure fluctuations that may affect oil and gas transportation efficiency or production safety.

General industrial turbine equipment: It can be used for various small and medium-sized industrial turbines and related servo systems, such as power turbine equipment in chemical production. By controlling the pressure of the associated servo system, it ensures stable power output of the equipment and adapts to the load requirements of different production processes.