|
DREHMO is a German manufacturer of valve actuators with 60 years of experience. Previously its actuators have also been supplied under the name of AEG / EMG .
DREHMO’s technically experienced and highly motivated engineers and technicians are making it possible to provide the best possible quality products to the world.
All products have to pass the Quality test in the quality control center individually, where they also calibrate and set the actuators according to the customer’s requirements that’s why they have technologically advanced products.
Wherever material flows through pipelines in liquid, gas or powder form several kinds of valves are used to shut off or to regulate the rate of flow or pressure. For reliable remote operation of these valves, wether they be globe, gate, ball or butterfly valves or damper, DREHMO electromechanical actuators and gearboxes have been employed successfully over the world for several decades.
DREHMO's products are best when you don't recognize that they are actually there. Therefore DREHMO tries as hard as possible to design and produce actuators and gearboxes that attract as little attention as possible throughout their entire life-cycle.
Actuators
|
Gearboxes
|
|
|
|
®
Standard Gear design and operating functions
The DREHMO® actuators basically consist of a motor, planetary gear arranged with a torque-bearing displacement worm, a handwheel and an integral switching device.
All parts of the planetary gear are arranged around the hollow shaft. As several teeth always mesh simultaneously with this planetary gear (unlike normal worm gears),it is possible to realize a very compact gear with a long service life.
|
|
Method of functioning for manual operation
Changeover from motorized to manual operation is not necessary. During manual operation via the hand wheel, the forces are transmitted via the worm (9), the sun wheel (11) and the planet wheel (4) to the driver plate (5) and then to the output drive (6).
|
|
.jpg)
|
1 TENV Motor
|
6 Stem Nut
|
11 Sun Wheel
|
|
2 Spur Gear
|
7 Torque Spring
|
12 Driver Pin
|
|
3 Eccentric Gear
|
8 Torque Lever
|
13 Hand Wheel
|
|
4 Planet Wheel
|
9 Worm Shaft
|
|
|
5 Driver Plate
|
10 Hollow Shaft
|
|
|
|
Method of functioning for motorized operation
The motor (1) drives the eccentric (3) via the spur gear (2). The planet wheel (4), which meshes into the inner gear of the sun wheel (11), is pivoted on the eccentric (3).As the two wheels have a different number of teeth, a relative speed is generated which is transferred by driver pins (12) to the driver plate (5), which is mounted on the planet wheel (4). The driver plate (5) is interlocked with the hollow shaft (10) via serration.
|
|
Torque-dependent tripping
In addition to the inner gear tooth system, the sun wheel (11) also has an outer gear tooth system which meshes with the axial displacement worm (9). The displacement worm (9) is held in its central position by pretensioned torque springs (7). If a higher torque is exerted on the actuator than the torque created by the pretensioned springs, the peripheral force on the sun wheel (11) moves the displacement worm (9) from its central position and actuates the torque lever (8). On the torque lever (8), the torque switches are activated via the trip cam.
|
|
