electro-hydraulic actuators - enertech: document...

IEEE Qualified for Valve and Damper ApplicationsIEEE Qualified for Valve and Damper ApplicationsIEEE Qualified for Valve and Damper ApplicationsIEEE Qualified for Valve and Damper ApplicationsIEEE Qualified for Valve and Damper Applications

Electro-Hydraulic Actuators

Electro-Hydraulic ActuatorsEnertech, formerly Paul-Munroe Hydraulics, is a business unit of Curtiss-Wright Flow Control Company. Since 1967, Enertech has specialized in the supply of hydraulic equipment to the commercial nuclear power industry. In 1978, we recognized the need for a compact, fast acting hydraulic actuator to meet the demanding require-ments of safe plant shut down and post accident cycling for valve and damper ap-plications, both inside and outside containment. For over 30 years, Enertech has supplied valve and damper actuators that are qualified to stringent IEEE Standards for harsh environment conditions.

Design

Enertech’s second generation electro-hydraulic operator (EHO) is fully self-contained for linear and rotary applications. The integral gas accumulator provides motive force for fail safe positioning upon loss of the electric command signal. The electric motor and hydraulic pump are IEEE qualified for post design basis event cycling following restoration of Class 1 power.

Enertech’s advanced EHO technology is ideally suited for large gate valves such as main steam isolation valves where high thrust, fast closing time of five seconds and sustained isolation force are mandatory. They are also designed for small torque outputs, such as damper actuators found on control room ventilation and other criti-cal HVAC applications. In addition, Enertech’s modulating EHO is industry proven in severe service control valve throttling applications including, PWR main steam atmo-spheric relief and main feedwater regulation.

EHOs may be specified with one common hydraulic power unit containing an elec-tric motor, pump and reservoir for fail safe control of up to four valves or dampers. Remote, skid mounted accumulators are offered for additional post accident cycling from stored energy without Class 1 power.

Replacement for Legacy Electro-Hydraulic Actuators

Enertech provides EHOs that are form, fit and function replacements for obsolete units found in many Generation II nuclear plants. Enertech’s gas over oil design elimi-nates complex air pilot control sub loops found in competitors’ older electro-hydraulic actuator designs. Commercially available sub-components assure uninterrupted af-termarket support for the life of your plant.

Environmental Qualification and Quality Assurance

Enertech EHOs are used in nuclear safety and non-safety related applications around the world. Enertech EHOs have been successfully tested and qualified to IEEE 382, Case IV for inside containment design basis radiation, pressure, and temperature for safe plant shut down use. Seismic, vibration, and chemical spray conditions have also been successfully met in accordance with IEEE 344 and 323 Standards.

All EHOs are manufactured under Enertech’s Quality Assurance Program which com-plies with 10CFR50 Appendix B and NQA-1. Other nuclear quality standards for non-ASME governed plants may be specified.

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EHO on a Main Steam Isolation Valve

EHO on an Atmospheric Steam Dump Valve

Electro-Hydraulic Actuators

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Electro-Hydraulic Electric MotorPneumatic

Why Enertech EHOs for Isolation and Throttling Applications?

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Integral, Post Accident Cycling

Fail Safe w/o Class 1 Power

Fast Acting (< 5 seconds)

X XNo Air Supply Required

XNo Bulky Spring Packs Required

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Highest Thrust/Torque to Weight Ratio

Less than 1% Positioning Error

Enertech Second Generation EHO Features and Benefits

• IEEE Qualified - inside and outside containment applications

• Compact Design - highest available thrust or torque output to weight/mass ratio

• Self Contained - safe plant shut down energy; no air or Class 1 power supply required

• Fast Acting Response - ANSI Class 900, 36“ gate valve Design Basis Event closure in less than 5 seconds. Closing time is independent of plant process condition and pressure

• Less than 1% Modulation Error - precise control valve positioning

• Partial Stroke Option - periodic testing of valve operability

• Dual Lock, Anti-Drift Design - prevention of position hunting

• Two Speed, Anti-Slam Damping Option - mitigation of water hammer

• Hand Pump Over Ride - manual cycling

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EHO Nuclear Applications

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Linear Modulating Linear Two Position (On/Off)

Self-contained, modulating operator for precise control of linear gate, globe and diaphragm throttling valves.

Self-contained, two-position linear operator for fast opening and closing of critical isolation valve applications.

· Main Steam Isolation Valves· Main Feedwater Isolation Valves· Main Steam Bypass Valves· Safety Injection Valves

Typical Nuclear Applications:

Product Description:

Features and Benefits:

Specifications:

· Recirculation Flow Control Valves· Main Feedwater Regulation· Atmospheric Steam Dump Valves

· IEEE Qualified for Inside and Outside Containment

· QME-1 Compliant

· Fast Acting (< 5 sec.)

· Anti-Drift Design

· Self-contained, No Air or Class 1 Power Required for Safe Plant Shutdown

· 10% Exercise Mode


· QME-1 Compliant

· Less than 1% Modulation Error



· Post Accident Cycling

Thrust: 5,000 to 250,000 lbs.Stroke Length: up to 28 in.Speed: up to 10.0 in./sec. Safety Modes: Fail Open; Fail Closed; Fail in PlaceQualified Life: 40 yrs., extendable to 60 yrs.

Thrust: 5,000 to 250,000 lbs.Stroke Length: up to 18 in.Speed: up to 10.0 in./sec. Control Signal: 4/20mA; 10-50mA; 1-5 VoltsSafety Mode: Post Accident CyclingQualified Life: 40 yrs., extendable to 60 yrs.

EHO Nuclear Applications

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Rotary Two Position (On/Off) or Modulating

Distributed Power Units Self Contained Rotary HVAC Damper

Self-contained, rotary operator for two-position or modulating service. Fast opening and closing and precise control of quarter turn ball, butterfly and plug valves.


· QME-1 Compliant

· Fast Acting (< 5 sec.)



· Two-Speed Damping


· QME-1 Compliant

· Compact Design for Direct Damper Mounting

· Weighs Less than 125.0 lbs.


· Self-contained, No Air or Class 1 Power Required

· Control Room Ventilation Dampers· Tornado Dampers· Containment Purge Dampers

· Feedwater Regulation Valves· Recirculation Flow Control Valves· Multiple Valves and Dampers

· Containment Isolation Valves· Containment Purge Valves· Recirculation Flow Control Valves· Service Water Isolation Valves

Compact, quarter turn, rotary operator for direct mounting to louver and butterfly dampers and small valves.

Torque: 2,000 to 300,000 in-lbs.Degree of Rotation: 0 to 180°Safety Modes: Fail Open; Fail Closed; Fail in PlaceQualified Life: 40 yrs., extendable to 60 yrs.

Torque: 100 to over 1,000 in-lbs. Degree of Rotation: 0 to 180°Response Time: < 10.0 sec.Safety Modes: Fail Open; Closed; Fail in PlaceQualified Life: 40 yrs., extendable to 60 yrs.


· Control of One to Four Valves or Dampers with One Hydraulic Power Unit


· Additional Gas Volume Capacity for Post Accident Cycling

Distributed control of multiple valves and dampers or for applications where equipment may be inaccessible.

Thrust: 100,000 to 400,000 lbs.Torque: 100,000 to 300,000 in-lbs.Safety Modes: Fail Open; Fail Closed; Fail in PlaceQualified Life: 40 yrs., extendable to 60 yrs.

EHO Major Components

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Reservoir Stores hydraulic fluid and feeds the pump to maintain hydraulic pressure and ensures the operator is able to function when required.

Rotary Hydraulic Operator

Linear Hydraulic Operator

Solenoid Operated Valves (SOV) Provides directional control of the cylinder by diverting the flow of the hydraulic fluid. SOVs are used for both modulating and two-position functionality.

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Hydraulic Cylinder Heavy duty, equal area design delivers consistent force when performing both linear or rotary operation.

Pressure Switches Monitors the pressure of the nitrogen for fail safe op-eration. They also maintain the accumulator pressure by turning the pump on or off at specified high or low pressure settings.

Accumulator Provides stored energy for fail safe operation and post accident cycling.

Hydraulic Pump Maintains pressure in the accumulator. The pump receives signals from pressure switches.

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EHO Major Components

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Condition Monitoring

Enertech can provide a continuous moni-toring solution to ensure uninterrupted op-eration and provide the earliest indication of trouble. Enertech’s diagnostic system monitors the EHO’s system pressure, temperature and motor cycling to identify issues and predict when maintenance is required, minimizing downtime.

Standard Specifications

Type - Self-contained electro-hydraulic or gas-hydraulic operator

Power Supply - 220VAC, 3ph, 60Hz; 460VAC, 3 ph, 60Hz; 480VAC, 3ph, 50Hz

Control Signal (mod.) - 4-20mA (250 ohms resistant)

Output - Standard Sizes

Linear - 2,000 lbs. to 250,000 lbs. (8.9 - 1,112 kN)

Rotary - 2,000 in-lbs. to 300,000 in-lbs. (226 - 33,895 Nm)

Stroke - Standard Sizes

Linear - Up to 28.0 inches (711.2 mm)

Rotary - Up to 180°

Cycle Life - 5,000 (linear); 10,000 (rotary); full stroke

Hysteresis - Less than 2% of input (modulating)

Linearity - Less than 2% of total span (modulating)

Stroking Speed - Adjustable from < 5.0 sec. to > 2.0 min.

Failure Mode - User selectable on loss of signal (Fail close, fail open, fail in place)

Environmental - IEEE 382-1980; IEEE 344-1975; IEEE 323-1974

Radiation - Total of 192 mega rads (100 mega rads normal/92 mega rads accident)

Seismic - Seismic levels to 4.0g’s OBE; 5.0g’s safe shutdown

Normal Conditions - 130°F (54.4°C), 100%RH

Accident Cond. - 425°F (202°C), 66.0psig (4.56bar), 100%RH

Hydraulic Fluid - Fyrquel®EHC

Integrated Performance Testing

This system allows the user to perform the same factory acceptance test performed by Enertech including stroke, deadband, linearity, hysteresis, feedback position, and frequency response. These tests can be performed remotely, minimizing risk from inaccessible locations and radiation exposure to plant personnel.

Pump Skid Integration

Enertech provides complete ASME Sec-tion III pump skid design and fabrication services for modularized delivery of safety-related units. Enertech can manufacture in accordance with ASME Section III, 10 CFR 50 Appendix B, Part 21 and NQA-1 for N Stamping of skid components and NPT Stamping of frame and connecting pipe. This includes seismic qualification of skid assemblies for critical to safety applica-tions such as Diesel Generator Lube Oil Conditioning and Supply System.

Additional Services

Enertech714.528.2301

http://enertech.cwfc.com [email protected]

2950 Birch Street Brea, CA 92821-6235

Electro-Hydraulic Valve and Damper Actuators

Enertech, a business unit of Curtiss-Wright Flow Control Company, is an engineering, manufacturing, distribution

and service company committed to providing solutions to meet the unique requirements of the nuclear power

industry. Enertech provides advanced valves, actuators, pumps, instrumentation, heat exchangers, fluid sealing

products, snubbers, diagnostic and test equipment, qualification and dedication services, maintenance, repair,

and engineering services to the nuclear power industry. Enertech, located in Southern California, is a member

of the Nuclear Group of companies (EMD, Nova, Scientech, Target Rock, Trentec), continuously supporting the

global Nuclear Power Industry for over 50 years.

First in Customer Service to the Global Nuclear Power Industry

BR - 1188 - 12.2010R1 - ET

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