WOODWARD QuickTrip Electro Hydraulic Trip Block Component

Product Core Overview

Application scenario: Designed specifically for gas/steam turbine shutdown systems, it is used to quickly and reliably discharge the turbine trip oil main, suitable for critical applications with high requirements for turbine operating time and availability.

Design Core:

Triple redundancy and fault tolerance design, adopting a 2 out of 3 voting mechanism, in compliance with API-670 industry standards.

Hardware fault tolerance: A single failure will not cause the turbine to shut down.

Key advantages:

Technological maturity: Based on the existing mature technology optimization of CPC II/VariStroke I.

Safety certification: SIL-3 level certification (TUV independent evaluation, compliant with IEC 61508 Parts 1-2/4-7:2010, IEC 61511 Parts 1-3:2004).

Performance indicators: Fast response (<50ms, loss of control signal to valve opening), fail safe operation (fail open).

Adaptability: Compatible with mineral and synthetic hydraulic oils; Meet the explosion-proof requirements of North American Class I Zone 1/2 and European Zone 1/2.

Auxiliary functions: local visual position indication, remote position feedback.

Technical comparison and design features (compared to CPC II/VariStroke I)

Key Explanation of Technical Module Comparison

The rotating inner valve core element is made of stainless steel material consistent with VariStroke I, with low driving force, high flow rate, and high pollution resistance

The outer sleeve component is independently designed with stainless steel material, which is corrosion-resistant

Dual axis bearings are consistent with VariStroke I and use mature bearing technology

The shaft seal shares the existing seal design reliability with both, ensuring consistency

The valve drive (LAT stator coil/magnetic rotor) technology is consistent, with upgraded specifications for larger LAT sizes, providing stronger driving force

The fault safety reset spring technology is consistent, and the material upgrade results in thicker springs, providing higher fault safety operating torque

Printed circuit board components (PCBA) are more simplified with no active components and have a more reliable structure

The hydraulic connection is consistent with VariStroke I and uses a 1.25 “61 type hydraulic flange

Newly added component observation window with a maximum design pressure of 100 bar, meeting visualization requirements

Key performance validation and testing

Reliability index:

Average Probability of Demand Failure (PFDAvg): 9.44E-06

Mean Time Between Failures (MTBF): 4950000 hours

Mean Time Between Hazardous Failures (MTBFD): 70600000 hours

Design lifespan: 20 years (including 1.5 years of storage period, no maintenance required)

Endurance life test:

Basic testing: 21000 trip cycles (covering maximum working hydraulic pressure under extreme high and low temperature conditions), equivalent to 3 times the typical service life, and all components meet specifications.

Extreme test: An additional 1000000 trip cycles without abnormal wear, calculated based on one cycle per day, equivalent to over 2700 years of operating life.

Stain resistance test:

Test conditions: Hydraulic oil contains pollutants such as iron oxide and Arizona road dust.

Result: No failure, no jamming/dragging phenomenon, no need to rely on easily problematic throttle holes and pressure gauges, reducing maintenance requirements.

Shock and vibration testing:

Impact test: Complies with US MIL-STD-810C method 516.2 (10G peak, 11ms duration, sawtooth wave, XYZ axis).

Vibration test: Complies with US MIL-STD 810F, M514.5A (0.015G ²/Hz, 10-500Hz, 1.04 Grms, 2 hours per axis).

Result: No component failure, no premature wear, and no false tripping.

Online testing and maintainability

Online testing capability:

Adaptation device: Woodward ProTechTPS security logic solver (or MicroNet security module).

Function: Automatically perform routine safety system diagnostic tests, support trip time response monitoring and recording.

Advantages: Regular health check ups, early fault detection, and trend analysis of trip time performance.

Online maintainability:

Modular design: The solenoid valves, electrical modules, power supplies, and wiring of each valve can be independently repaired/replaced.

Repackable components: solenoid valve coil (LAT), electronic module (PCBA with position sensor), upper cover/observation window, lower cover/reset spring, rotor (corresponding module needs to be powered off during maintenance).