VICKERS steam turbine control system piston pump

The piston pump in the VICKERS steam turbine control system has high precision, high reliability and long life as its core advantages. It realizes high-efficiency HYDRAULIC transmission through axial or RADIAL structure design. It is widely used in steam TURBINE speed regulation, lubrication and anti-fuel systems. It is a key component to ensure the safe and stable operation of the unit. The following is the specific analysis：

1. The core types and technical characteristics of VICKERS piston pumps
   Axial piston pump
   Structure: The plunger is arranged parallel to the drive shaft, and the plunger is driven to reciprocate by a swash plate or oblique shaft mechanism.
   advantage：
   High volumetric efficiency: The precise fit of the plunger and the cylinder hole (the gap is only 0.0015-0.0025mm) reduces leakage, and the volumetric efficiency can reach more than 95%.
   Low noise: smooth flow output and shock absorption design reduce operating noise.
   High pressure capacity: The rated pressure can reach 400bar to meet the needs of the high pressure hydraulic system of the steam turbine.
   Application: steam turbine speed control system, servo valve drive, lubricating oil pump, etc.
   Radial piston pump
   Structure: The plunger is arranged perpendicular to the drive shaft and driven by an eccentric wheel or cam.
   advantage：
   Strong impact resistance: the axial flow distribution structure (such as the PVB series) can withstand high-pressure shocks and has a longer life span than the axial pump.
   High control accuracy: the variable mechanism realizes displacement adjustment by changing the eccentric distance of the stator, and the response speed is fast.
   Application: anti-fuel system, high-pressure lubrication system, etc.
2. The key role in the steam turbine control system
   Speed control system
   Function: High-pressure hydraulic oil is provided through the piston pump, and a servo valve is driven to control the opening of the steam turbine inlet valve to achieve precise adjustment of speed and load.
   Case: THE VICKERS SM4-20 servo valve cooperates with the axial piston pump to convert the electrical signal into a hydraulic output, and the response time is ≤10ms to meet the frequency adjustment needs of the power grid.
   Anti-fuel system
   Function: Provide circulation and pressure support for phosphate anti-fuel (such as EHC oil) to prevent valve jamming.
   Advantages: VICKERS piston pumps use corrosion-resistant materials and special sealing design, which are compatible with fuel resistance and extend system life.
   Lubrication system
   Function: Provide high-pressure lubricating oil for steam turbine bearings to reduce friction and wear.
   Case study: PVQ series variable piston pumps can automatically adjust the displacement according to the load to ensure stable lubricating oil flow.
3. Typical product series and performance parameters
   Series typeRated pressure (bar)Speed range (rpm) core advantages
   PVQ axial variable piston pump 250-400 500-3000 high precision variable control, low noise
   PVB radial variable piston pump 350-700 800-2000 impact resistance, long life, high pressure capacity
   PVM compact axial pump 210-350 1000-4000 small size, light weight, suitable for mobile devices
4. Selection and maintenance recommendations
   Selection principle
   Pressure matching: According to the pressure of the steam turbine system, select the pump type whose rated pressure is higher than the maximum pressure of the system by 10%-20%.
   Flow requirements: Calculate the flow required by the system (for example, the flow of the speed regulating system needs to cover the maximum load change rate).
   Media compatibility: Corrosion-resistant materials (such as stainless steel pump body) are required for anti-fuel systems.
   Maintenance points
   Oil cleanliness: Maintain the cleanliness of NAS level 6 or below to prevent wear and tear of the oil distribution pan.
   Temperature control: Too high oil temperature (>80℃) will accelerate the aging of the seal, and a cooler is required.
   Regular inspection: check the flexibility of the variable mechanism every 500 hours, and replace the hydraulic oil every 2000 hours.

V. Application cases
A 600MW steam turbine set: VICKERS PVQ40 axial piston pump is used to drive the speed control system to achieve a speed control accuracy of ±1rpm, and it has been running without trouble for 5 years.
Steam turbines for nuclear power plants: use PVB29 radial piston pumps to provide anti-fuel pressure, and withstand high-pressure shocks in the radiation environment through the axial flow distribution structure, with a life span of 100,000 hours.