E2H-ESD
Electro-hydraulic Emergency Shut-off Valve Automation
Introducing the new Cowan Dynamic’s E2H-ESD. From our line of Electrohydraulic actuators (E2H), this unit has been specifically designed to operate emergency shut-off valves (ESDV).
Understanding how crucial ESD valves are for the safe operation of piping systems, the E2H-ESD actuator provides fast, safe, and reliable failure conditions on loss of power and/or ESD signals.
The E2H-ESD emergency shut-off valve actuator is designed to operate in hazardous areas and under extreme conditions.
Learn About the E2H-ESD Modular Features
Hydraulic Power Module
Control Panel
Local/Remote controls Module: Can be mounted directly on the unit providing a self- contained compact design or remotely in cases where the unit cannot be accessed easily due to installation or environmental conditions.
Hydraulic Cylinder Module
Cowan's Series ML: NFPA heavy-duty 3000 psi rated linear actuator
Scotch Yoke Mechanism Module
Symmetrical units completed with +/- 5% mechanical travel stops, local visual indicators, and a rotary beacon with position feedback for end-to-stroke and partial stroke set points
Spring Canister Module
Fully sealed compact canister, all welding is certified to CSA 47.1 Division 2. This spring canister is also fully modular and field-replaceable.
The hydraulic power module of the E2H-ESD contains all hydraulic components to transform the supplied electric energy to the required hydraulic power supply. It is field replaceable and can be installed remotely for applications where vibration is a concern.
It mainly consists of a manifold block, hydraulic pump, electric motor, hydraulic compensation accumulator, oil reservoir, and enclosure frame.
Manifold block
All hydraulic components and sensors are integrated into a compact manifold block. Fast failure or safe position speeds are achieved by an exchangeable secondary tamperproof manifold designed for the required speed.
Hydraulic Compensation Accumulator
Ensures no changes in the hydraulic system due to thermal expansion.
Enclosure Frame
Even when all components within this module are rated for hazardous areas the module is fully enclosed and pad-lockable for additional protection to environmental conditions and operator's safety.
Hydraulic Pump-Motor
E2H-ESD Features
E2H-ESD Electro-Hydraulic Valve Actuator Specifications
Service | On/Off - Emergency Shutoff |
Ambient Temperature rating | Standard - (-20C to +40C) |
Environmental Protection | NEMA 4X/IP66 |
Hazardous area classifications | Class 1, Division 1, Gr C&D (CSA/cUL) |
Max available torque | 3,000,000.00 Lbs-in Hydraulic output 306,000.00 Lbs-in Spring output |
Certifications | SIL-3 (Pending) |
Partial stroke | Standard - 3rd limit switch, set position |
Duty Cycle | Standard - On/Off Applications |
Conduit Entries | Four (4) bottom ½” NTP entries |
Rotary Valve Types | Ball Valve, Butterfly Valve, Plug Valve, etc. |
Common Applications | Conventional, gas storage, HP/HT Wells. Pipelines, tank farms and others |
Common Terms | Surface safety valve, safety shutoff valve, emergency shutdown valve (ESDV), hydraulic shutdown valve, shutdown valve (SDV), emergency shutoff valve |
Voltage | Phase | Hz |
120VAC | 1 | 60 |
240VAC | 1 | 60 |
115VAC | 1 | 50 |
460VAC | 3 | 60 |
575VAC | 3 | 60 |
208VAC | 3 | 60 |
Local Operation | § Standard Display: |
Remote Operation | § Standard Inputs: |
*Smart display available only for general purposes application and at operational temperature range of -30C to +40C | |
Comparison Table |  E2H-ESD |  E2H90 |
Actuator mechanical Design | Scotch Yoke | Scotch Yoke |
Failure system | Spring return, fully sealed in a compact canister. Welding's Certified to CSA 47.1 Division 2. Option for hydraulic return on preloads higher than 306,000 lbs.-in | Hydraulic accumulators system designed to 2 strokes. Option for spring is available |
Fail Function | Fail on Loss of power & ESD Signal | Fail on Loss of ESD Signal |
Operational ambient temperature rating | (-50C TO 40C) | (-40C TO 70C) |
Control Panel | Standard: Installed on the unit wired and tested | Standard: Installed on the unit wired and tested |
Interface | Standard-Power/Overload/Open/Closed & PST light indicators. Open/Close/push buttons | Standard LCD Screen, circuit printed board. Navigation buttons, Open/Close buttons. Local, Remote selector |
Communication | Standard: Discrete. Open/close/ESD/PST | Standard: Discrete. Open/close/ESD/PST |
Environmental Protection | NEMA 4X, IP66 | IP67 |
Hazardous Area classification and certifications | CSA or uL or cUL CI1,Div1&2,Gr C&D | Ex d IIC T6 |
Power Supply Voltage | 120VAC/60Hz/Single phase. Options available | 220VAC/50Hz/Single phase. Options available |
Manual Override | Standard: Manual Hydraulic pump | Standard: Manual Hydraulic pump |
Partial Stroke | Comes standard, set at a set position. Standard 20% open. Speed adjustable | Comes standard, set at a set position. Standard 20% open |
Fail safe time | Fast- Less than 15 secs for all models. Adjustable and padlock able | Standard : Fixed. Not adjustable. |
Stroke operation | Directly driven by the hydraulic pump. No down time, recharge not needed | Driven by the pressurized fluid in the accumulators. Accumulators sized to 2 strokes, after this accumulators must recharge |
Recharge time | Not required. Unit is always available to stroke the valve | Between 15 to 30 mins depending on the model |
Modular Design | Yes, Controls and hydraulics can be provided remotely mounted as a standard design if required | No |
Hydraulic Design | All Hydraulic components and sensors are integrated into a compact manifold block. The complete hydraulic system is Fully enclose and pad-lockable | All hydraulic valves are included in a enclosed cabinet, interconnection between components is all done with stainless steel tubbing and fittings. |
Mechanical travel stops | Mechanical travel stops +/- 5% and local position indicator | Mechanical travel stops +/- 5% and local position indicator |
SIL Certification | SIL 3 (Pending) | SIL 2 (HFT)=0 ; SIL 3 (HFT>=1) |
Lifting lugs | Yes | Yes |
Learning Center for E2H-ESD Hydraulic Actuator
What is an ESD Valve?
Where are ESD valves most used?
In the E2H-ESD actuators, all hydraulic components and sensors are integrated into a compact manifold block. This results in space saving, ease of installation and elimination of leaks and break points by removing all hoses which leads to reduction in down time required for service.
Units come standard with components certified to Explosion proof under hazardous area classifications, even when all components within this module are rated to hazardous areas the module is fully enclosed and pad-lockable for additional protection to environmental conditions and safety to operators
The E2H-ESD uses a hydraulic cylinder from Cowan’s own series of heavy – duty 3000 psi rated linear actuator, ML.
To ensure a safe and reliable failure condition regardless of the operation status, the power-fail-safe model of the E2H-ESD is completed with a spring that is fully sealed in a compact canister, all Welding is Certified to CSA 47.1 Division 2.
The electrical control panel comes standard mounted directly on the unit providing a self- contained compact design ready to be used. When required, the panel can be mounted remotely in the areas where the unit cannot be accessed easily due to installation, environmental conditions, etc. Moreover, to provide cost savings and ease of status monitoring for operators in case of multiple actuators, a central control panel can be mounted remotely to control multiple units.
Designed to be energy efficient, In the E2H-ESD Series actuators the motor stops when there is no movement required from the valve, this leads to very low power consumption and increased life of moving components.
Understanding that emergency shut off valves are critical parts of safety systems and therefore a reliable actuator is a must, the design of the E2H-ESD is a non-complex (Type A) component based on the definition of IEC 61508 (device with well-defined failure modes, well known failure rates, and behavior under fault conditions that can be completely determined), for which has a Safety Integrity Level of 3. Components which are in effect in the fail-safe function are all SIL certified.