Description

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Electric Actuator

product-436-345

Overview

CNZ series electric valve actuators, optimized protection performance and key components, have the advantages of compact structure, small size, beautiful appearance, stable and reliable performance, etc. Good protection level can meet the needs of various designs: explosion-proof type, integral on-off type, and integral modulating type. CNZ series products are used to control the opening and closing of valves. It is suitable for gate valves, globe valves, shut-off valves, diaphragm valves, and its derivative products are suitable for ball valves, butterfly valves and dampers, etc. It can accurately operate according to control instructions, and is essential for remote control, centralized control and automatic control of valves. Less drives. The performance of this product complies with the provisions of JB/T8528-1997 (Technical Conditions for Ordinary Valve Electric Devices). The performance of the explosion-proof type conforms to GB3836.1-2000 (Part 1 of electrical equipment for explosive gas atmospheres: general requirements) GB3836.2-2000 (Part 2 of electrical equipment for explosive gas atmospheres: explosion-proof type "d") and JB/ Regulations of T8529-1997 (Technical Conditions for Explosion-proof Electric Devices).

Technical Conditions

1. Power supply: The motor is three-phase AC AC380V, 50Hz. Single-phase AC AC220V, 50Hz, optional power supply: AC220~660V, 50.60Hz (please specify when ordering)

2. Ambient temperature: -20C to +60C optional temperature -40C to +70C

3. Relative humidity: not more than 95% (at 25C)

4. Working environment: ordinary type is used in places without flammable, explosive and strong corrosive media: explosion-proof type (EXDIIBT) uses explosive gas mixtures of IIA, IIB grade T1-T4: explosion-proof type (EXDIICT4) CT4 can Application environment covering BT4

5. Protection level: IP65, IP67, IP68

6. The motor is working system; the rated running time is 10 minutes (24 hours for special order), F class insulation

7. Anti-corrosion coating: high temperature baking paint

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Performance Parameter Table

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Structure

The electric valve actuator consists of six parts, motor, gearbox, control mechanism, hand-electric switching mechanism, handwheel parts and electrical parts. The following figure shows its transmission principle

product-600-301

1. Motor: It adopts an outdoor three-phase asynchronous motor, which is a short-time working system, and the rated continuous working time is 10 minutes.

2. Reducer: It is composed of a pair of spur gear and worm gear, and the power of the motor is transmitted to the output shaft through the reducer.

3. Control mechanism: It is composed of torque control mechanism, stroke control mechanism and adjustable opening indicator, which is used to control the opening and closing of the valve and indicate the valve position.

(1) Torque control mechanism: It is composed of crankshaft, stopper, cam indexing plate, support plate and micro switch. When the output shaft receives a certain resistance torque, the worm will not only rotate, but also produce axial displacement, driving The bell crank rotates, and at the same time, the block also produces an angular displacement, thereby approaching the cam, and lifting the support plate. When the torque on the output shaft increases to a predetermined value, the support plate is lifted until the micro switch acts, the power is cut off, and the motor stops, so as to realize the control of the output torque of the electric device.

product-629-264

(2) Stroke control mechanism: It consists of a decimal gear set, a push rod, a cam and a micro switch, referred to as a counter. Its working principle is that a driving pinion (Z=8) in the reduction box drives the counter to work. If the counter has been adjusted according to the opening or closing position of the valve, when the counter rotates to the pre-adjusted position (number of turns) with the output shaft, the cam will be rotated 90° to press the micro switch to act, cut off the power supply, and the motor will stop. Turn, one realizes the control of the stroke (number of turns) of the electric device. In order to control the valve with more turns, the cam can be adjusted to rotate 180° or 270° and then press the micro switch to act.

(3) Adjustable opening indicator: It is composed of a reduction gear set adjusting gear, a valve opening dial, a cam, a micro switch, and a potentiometer. During on-site debugging, the adjustment gear can be adjusted to the required position according to the number of turns of the valve switch, and meshed with the reduction gear set (the number of turns required on the column). When the valve is in the process of opening or closing, the opening disc rotates after deceleration to indicate the switching value of the valve, and the indicating angle is synchronized with the switching value of the valve, which is used for remote transmission to indicate the valve position.

product-284-308

Hand-electric switching mechanism: it is a semi-automatic switching, the switching handle needs to be pulled to change from electric to manual operation, and it can be done by itself when changing from manual to automatic (no need to pull the switching handle). When changing from electric to manual, that is, manually pull the switching handle to move the intermediate clutch on the output shaft upwards and compress the spring. When the handle is pushed to a certain position, the intermediate clutch disengages from the worm gear and engages with the manual shaft pawl, so that the force on the hand wheel can be transmitted to the output shaft through the intermediate clutch, and it becomes a manual state. Automatically switch when manual becomes electric. When the motor rotates to drive the worm gear to rotate, the upright rod immediately falls down. Under the action of the compression spring, the intermediate clutch quickly moves to the direction of the worm gear, disengages from the manual shaft, and meshes with the worm gear, then becomes the electric state.

product-603-297