Category: Industry Trends

WOODWARD | INDUSTRIAL TURBOMACHINERY SYSTEMS

PRODUCT FEATURES

Æ Dirt-tolerant design (25lb rotary chip shear force)

Æ Self-cleaning valve design (rotary solenoids)

Æ Fast trip times (< 50 ms solenoid action)

Æ Increased reliability (2-out-of-3 voting design)

Æ Repairable online

Æ Testable on-line

Æ Safety certified for use in IEC61508 SIL-3 systems

Æ API-670 Compliant

Æ Local & remote position indications

Æ Compact size

Æ Certified for hazardous locations

The QuickTrip trip block assembly is designed for use in steam, gas, and hydro

turbine shutdown systems for quick and reliable dumping of the turbine’s trip oil

header. This integrated trip block assembly is intended for use on mechanical-drive

or generator-drive steam turbines that use low pressure (5–25 bar / 73–363 psi)

hydraulic trip oil headers.

The QuickTrip’s fault tolerant design makes it ideal for critical steam turbine

applications, where turbine up-time and availability are essential. This trip block

assembly’s 2-out-of-3 voting design provides users with a very high level of system

reliability as well as compliance with industry standard API-670.

The QuickTrip is certified for use in IEC61508 based turbine safety systems, and

when paired with the Woodward ProTechTPS, can be applied into systems that

require a “Safety Integrity Level – 3” rating or below.

Specifications

Physical and Performance Specifications

Solenoid Response Time: < 50 ms*

Failsafe Operation: Internal return spring on each solenoid valve

Weight: 110 kg (242 lb)

Mounting: Vertical mounting

* Solenoid response time represents the valve trip time and is defined as the time from when the solenoid

is de-energized to the time when the valves are at the full open position.​

Environmental Specifications

Ambient Temperature: (–40 to +85) °C / (–40 to +185) °F

Ex nA nC Minimum Ambient

Temperature: -20 °C (-4 °F)

Vibration Resistance: MIL-STD 810F, M514.5A, Cat. 4

(0.015 G²/Hz, 1.04 Grms)

Shock Resistance: US MIL-STD-810C method 516.2. procedure 1

(10 G Peak, 11 ms duration, saw tooth)

Corrosion Resistance: Two-part epoxy paint coating. Designed for outdoor conditions.

Ingress Protection

(IEC 60529. IEC 60079-0): IP66

Electrical Specifications

Supply Voltage: 24 VDC nominal ± 10% (use cable at least 0.8mm² / 18 AWG)

Current Consumption: 8 A max (2.6 A per channel max) at steady state @ 24 V

Control Input Voltage: 0-32 VDC, 20 mA max

Feedback Output Signal: Resistive: 2 A @ 28 VDC, max 32 VDC

Inductive: 0.5 A @ 28 VDC (max. 0.2 Henry)

Supply Voltage Connections: Terminal suitable for 0.8 to 3.3 mm² or 18 to 12 AWG stranded wire

Control Input and Discrete

Removable terminal suitable for 0.8 to 3.3 mm² or 18 to 12 AWG

stranded wire

Connections:

Cable Entries: 3 X 0.750”-14 NPT

1 Ground

Rotary Trip Valves

All three of the QuickTrip’s trip valves are spring return, two position rotary valves. When any of the

hydraulic valves is in its closed position, the ports in the valve are blocked preventing hydraulic flow

through the valve. As a valve rotates to the tripped position, the ports open and the trip header pressure

is connected to either the drain, or the inlet ports of another one of the valves. The combined action of

the three valves results in trip header pressure being connected to drain only when 2 or 3 valves are

tripped.

If the unit detects any shutdown condition or loss of power occurs, the trip valve return springs will force

the valves to the fail-safe / tripped position.

Electric Valve Actuators

The QuickTrip uses a set of three unique rotary solenoids called limited angle torquers (LAT). The

permanent magnet rotor is directly coupled to the trip valve.

The position of the valves is sensed by two limit switches present on each of the electrical modules.

These limit switches are located on both the closed and tripped positions of the valves, allowing the user

to easily determine the position of each valve.

Chemically Resistant Versions

For steam turbine applications where lube oil contains harsh chemical contaminants (ammonia, hydrogen

sulfide, etc.), a chemically resistant version of the QuickTrip has been developed. Chemically resistant

versions feature best-in-class seals in all wetted locations within the trip block assembly. Chemically

resistant versions provide an optimal solution for extreme chemical resistance while still maintaining

QuickTrip operating pressure and temperature ranges. Please contact Woodward for available models

and information regarding chemical resistance for specific applications.

Electric Valve Actuators

The QuickTrip uses a set of three unique rotary solenoids called limited angle torquers (LAT). The

permanent magnet rotor is directly coupled to the trip valve.

The position of the valves is sensed by two limit switches present on each of the electrical modules.

These limit switches are located on both the closed and tripped positions of the valves, allowing the user

to easily determine the position of each valve.

Electronic Driver Modules (PCB)

The printed circuit boards (PCB) are mounted on of the top of each valve module. The PCB(s) performs

the following tasks:

• Trip demand input

• Dual redundant power inputs

• Valve position feedback discrete outputs

• Visual valve position indication

Discrete outputs are provided for position feedback indication of each valve module. Within each valve

module, there are also four LEDs that indicate the current condition of the module as well as power

supply health. These LEDs are viewable through the module covers’ transparent sight window.