2
1.4 Major components and function
1.4.1Motor: Input power supply of electric actuator. YDF specialized motor for electric valve.
Technical parameters comply with related national regulations. Its torque performance complies
with valve’s loading performance.
1.4.2 Reducer: NQB1 and NQB1.IN applies one stage spur gear pair and two stages worm gear
pair. For NQB2 and NQB2.IN, NGW planetary reducer is added to the lower part of NQB1 and
NQB1.IN. The range of output speed of the above products is wide and the output shaft has a good
self-locking function.
1.4.3Stroke control and position indication mechanism: they are used to control valve’s end
position and they send electric contact signal of position to control room. They can indicate
valve’s position on site and send consecutive electric signal of the position to control room. This
mechanism composes of stroke cam, micro switch, dial and potentiometer. Adjustment against
this mechanism shall be made after electric actuator is combined with valve.
1.4.4 Torque control mechanism: it is used to protect electric actuator and valve when overload
at the valve side happened. Torque signal comes from the axial displacement generated when the
axial force on the worm compresses the disc spring. The torque switch is composed of cam and
micro switch. User does not need to re-adjust this mechanism since it has been set up before
factory delivery.
1.4.5 Manual/Electrical switching handle and manual mechanism: Used for the manual
operation under the repair, commissioning and emergency state. Adoption of semi-automatic
electrical priority mode, the operation method is to push the switching handle arm and hold its
position to complete the Manual/Electrical switching handle, rotate the handle to carry out manual
operation; release the switching handle arm after the manual operation, this mechanism will return
to the electrical position (When pushing the switching handle arm, the handle may be rotated
properly to make the internal mechanism engaged).
1.4.6 Mechanical limit mechanism: used to restrain the limit position of the output shaft. Since
it has been adjusted before factory delivery, it should not be loosened at will in case of
over-adjustment disengage the worm segment and worm. The mechanical limit of NQB2 and
NQB2IN is on NGW planetary reducer.
1.4.7 Spline joint: used to connect valve worm and output shaft of electric actuator. This can be
easily taken out and be processed according to the dimension of worm’s hole and key, which is
beneficial for the mount and dismantle for the valve against electric actuator.
1.4.8 Integral controller: for the integral type of this product (NQB1.IN, NQB2.IN), the integral
controller is a part of the main product body. There is AC contactor and other electric components
in this controller. There are switching buttons, control buttons, and valve position signal on the
product’s body cap.
1.4.9 Sealing wire plug: used for the introduction of power cable and control cable. It can
ensure the sealing performance of the electric wiring of electric actuator. The input sealing wiring
plug of the standard type product is on the main body of actuator. For the integral type, it is in the
integral controller. For the explosion-proof type and integral, explosion-proof type of electric
actuator, the sealing input wire plug is in the wiring box.
1.4.10 Wiring terminal board: used to connect the wires with power cable and control cable. For
the standard type of product, the wiring terminal board is in the stroke and torque control cavity;
for the integral type of product, it is in the wiring cavity which is at the back of integral controller.
2.Product mounting
2.1 Mounting position of electric actuator
Electric actuator can be mounted at any position, but the following two positions are better.
2.1.1 Vertical: the flange connected with the valve is parallel to the floor. That is, the center
Содержание NQB1
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