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Mechanical Valves & Piping's Print this page  
Ring Main Electro-Hydraulic Actuators  
1. Position Indicator
Linear Potentiometer within Actuator
2. Electronic Positional (EExde-Atex)
·  Comparator Control
·  Microprocessor Control

Power Supply nominal
24v DC - others available
Input Signal normal 4-20ma - others available
Accuracy ± 1%
3. Linear Actuator
Construction - Stainless Steel

Types Available:
·  Double Acting Spring to Close
·  Spring to Open
4. Drive Coupling
and Visual Indicator to suit Customer Valve
5. Mounting Bracket
designed to suit Customer Valve
6. Manual Hand Pump
Override (if required)
7. Accumulator Storage
(if required)
8. Valve end of stroke indication (if required)
9. Stainless Steel Hydraulic Control System
housed within IP66 Stainless Steel Cabinet
10. System types available
Stepping or Positional/Modulating
·  Stayput Fail Close
·  Fail Open

Solenoid Classification
Increased Safety EExme II T4-T6 Atex
Intrinsically Safe EExia IIC T4-T6 Atex
Flameproof EExde IIB T4-T6
Explosion proof U.L. for America and Canada
11. Hydraulic Power Source
Self-contained
·  Centralized
·  Existing
12. Optional Sunshade for high ambient environments

 

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EExd, ATEX Self Contained Electro-Hydraulic Actuators  
EExd, Atex Motorized Pump (supply voltage to suit)
Stainless Steel Fluid Reservoir c/w pressurized filler cap
EExd, Atex Pressure Switch - pump stop/start
EExd, Atex Pressure Switch - low pressure alarm
Hydraulic Control System
Hand Pump for manual operation
Linear Potentiometer or Transducer for feedback signal
Stainless Steel Linear Hydraulic Actuator
Accumulator Storage
Electronic Positioner within EExd, Atex Enclosure
EExd, Atex Starter Control Box c/w local and remote alarm facility
EExd, Atex High Temperature Indication
EExd, Atex Low Fluid Level Indication
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EExd, ATEX Electro-Hydraulic Actuators with Infared Control  
Operational Philosophy

The Midland-ACS 900 AND ACS 603 IR EExd-Atex Electronic Positioners will control Electro-Hydraulic EExme, Atex Solenoid Valves to position a hydraulic actuator proportional to a linear, analog command signal. Positional feedback is via a potentiometer or transducer mounted within the actuator. Local control and calibration via an intrinsically safe infrared handheld keypad controller
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Turbine Bypass Valve Control System
 
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