VALVE ELECTRIC ACTUATORS

VALVE ELECTRIC ACTUATORS: 1,These actuators have following features: 1.1. non-intrusive, easy to commission 1.2. precise and reliable measurements of position limit and torque level 1.3. providing double-speed (speed-changeable and slow closing) functions 1.4. providing comprehensive data logging 1.5. self-diagnostic and self-adapted functions 1.6. automatic phase-rotation-corrective function 1.7. trouble-diagnostic function in operation 1.8. network transmission functions 1.9. overheat-protection for electric motor 1.10. transient reverse protection 1.11. language option of page layout 1.12.locked password function of control status. 2.SERVICE ENVIRONMENT AND MAIN TECHNICAL PARAMETERS: 2.1 Service environment 2.1.1 Power supply: 380 V ± 10%, 50 Hz ± 1% (For other specifications of voltage and frequency ,special order is needed.) 2.1.2 Environmental temperature: -20 60ºC (- 40 +70ºC available for special order) 2.1.3 Relative humidity: ≤95% (+25) 2.1.4 Signal: input: 4 20 mA DC;output: 4 20 mA DC 2.1.5 Deadband: 0.5% 9% adjustable 2.1.6 Duty: S5 (intermittent operation with electrical braking), minimum load held ratio 25%, maximum operating number of times 1200 cycles/hour 2.1.7 Enclosure protection: IP68 (4 meter below water surface for 68 hours) 2.1.8 Flameproof mark: Exd , ExdibBT4 and ExdibCT4, for hazardous zone with Class B C explosive gases of temperature groups T1 T4. 3.GENERAL DESCRIPTION OF ACTUATOR CHANGZHOU-CDF (abr. as SND) non-intrusive intellectualized electric modulating actuators are products of a new generation and designed with introduced technology from Schneider and developed by cooperation. SND non-intrusive intellectualized electric modulating actuators consist of products of three ranges: linear type, multi-turn type and angular travel type (There are two structures for angular travel type: integral and combined). They are suitable for industrial-process loop control systems and enable to control gate valves, globe valves, throttle valves, ball valves, butterfly valves and various modulating valves precisely. These products are divided into two models depending on service environment: normal and explosion-proof. Their general performance is conformed to the requirements of Standard JB/T 8219- Electrical Actuators for Industrial-process Measurement and Control System. And the explosion-proof performance of explosion-proof models is conformed to the requirements of Standard GB 3836.1- 2000 Electrical Apparatus for Explosive Gas Atmospheres Part : General Requirements, and Standard GB 3836.2- 2000 Electrical Apparatus for Explosive Gas Atmospheres Part : Flameproof Enclosure d.