DREHMO®

Operating manual for

bevel gear boxes
Type: A(B)…1 – A(B)…300
DE 24 – DE 450

Partnumber 166673
Installation instructions Revision 1.2
Service instructions Date: 18.11.2010
for bevel gear boxes

NOTE
This instruction manual is part of the supply and should be kept for
future use.
english
DREHMO® Reliable Valve Operation

Contents
1. Warning .................................................................................... 3

2. Storage ..................................................................................... 4

3. Weights table ............................................................................ 5

4. Lubrication ................................................................................ 5

5. Installation procedures ............................................................. 7

6. Routine maintenance................................................................ 9

7. Environmental specifications .................................................. 10

8. Spare parts ............................................................................. 11

9. Design of valve flange ............................................................ 13

10. Transport and lifting ................................................................ 14

This symbol signifies "ADDITIONAL INFORMATION".

Failure to follow may lead to damages.

This symbol signifies "WARNING!"

Failure to follow may result in injury to persons or material damage.

page 2 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

1. Warning
Work on electrical equipment and electrical installation work on actuators
must be carried out by electricians or under supervision of fully qualified
engineers, in accordance with the applicable electrical rules.

• Never install the bevel gear before carefully reading the following
instructions and also the actuator instructions.

• FAILURE TO FOLLOW THESE INSTRUCTIONS MAY LEAD TO

SEVERE DAMAGES OR INJURIES

Bevel gears may be delivered with the stem nuts loosely fastened in place. This means
that they may fall out of their seats while the units are being handled and cause severe
injuries. Therefore remove the stem nut of the gear box before transportation and
replace it when the handling operations have been carried out.

Caution!
• Never use levers to increase the torque when opening or closing the
bevel gear with the help of the hand wheel.
• Never remove the bevel gear from the valve when the line is under
pressure.
• Never attach an electric actuator to a motor driven bevel gear without
adjusting the limit and torque switches making sure that the bevel gear
is suitably matched to the actuator stalling torque (see also data sheets
on our homepage and Table 1 in chapter 5).

Note: Any application limits or deviations which differ from the technical documentation
are listed individually in the order confirmation.

Failure to follow these instructions can cause damages to the gear box, valve or
actuator which lead to the loss of guarantee claims.

Operating instructions Bevel gear Boxes type A(B)R and AS page 3 of 16

DREHMO® Reliable Valve Operation

2. Storage
Storage

The bevel gears are delivered with K3 or K4 coating according to specification. If bevel
gears are not mounted, they have to be stored in a dry room with a temperature of
minimum 15 °C. The standard versions of our bevel and spur gears should not be
stored outdoors, unless they are adequately protected against moisture.
When installed the protection class is IP 65 (optional IP 67 or IP 68). Details are listed
in the order acknowledgement.

page 4 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

3. Weights table
Kg Lbs
A(B)P1,A(B)03,A(b)04, 8 18
A(B)05
A(B)11 12 27
A(B)13 15 34
A(B)24,A(B25 27 61
A(B)33 58 131
A(B)43 76 171
A(B)70 125 282
A(B)90 160 360
A(B)110,A(B)111 310 698
A300 730 1655
DE24 9 20
DE43 13 29
DE90 45 102
DE110 45 102
DE450 110 250

* The weights shown in the table are only approximate values and may vary according
to the type of application.

4. Lubrication
The bevel gears are provided with life-time grease lubrication when delivered. However,
it is recommended to externally check the gear box before installation to see if any
grease is leaking and add the missing grease through the greasing inlets above the
pinion, the bevel gear wheel and spur gears.
For “R” type bevel gears it is additionally necessary to grease the thrust bearings and
axial bearings before assembling the stem nut.

Bevel and spur gears are lubricated with AGIP GR MU/EP1 grease, suitable for use
within the temperature range of -25 °C to +80 °C range (explosion-proof gears with
ATEX certification for ambient temperatures between –20 °C and +40 °C acc. to DIN
EN 13463.1) - lithium based grease with a specific EXTREME PRESSURE additive.

For non-standard applications (e.g. low temperature, high temperature, etc.) which the
customer specified, the bevel gears will be filled with special lubricants FUCHS
RENOLIT HI TEMP 2 for temperature ranges from -50 °C to +80 °C and oil for subsea
version with a depth of more than -25 metres.

Operating instructions Bevel gear Boxes type A(B)R and AS page 5 of 16

DREHMO® Reliable Valve Operation

The quantities of AGIP GR MU/EP1 lubrication required for the bevel gears and spur
gears are shown in the table below.

Kg Lbs
A(B)P1,A(B)03,A(B)04, 0.2 0.45
A(B)05
A(B)11 0.2 0.45
A(B)13 0.25 0.56
A(B)24,A(B)25 0.4 0.9
A(B)33 0.8 2.0
A(B)43 1 2.25
A(B)70 2 4.5
A(B)90 2.5 5.62
A(B)110,A(B)111 3 6.75
A(B)300 6 13.5
DE24 0.08 0.18
DE43 0.2 0.45
DE90 0.4 0.9
DE110 0.6 1.35
DE450 1.1 2.47

If bevel gears are stored for longer than three months, we recommend that they should
be placed on the flat side of the output and operated by hand without any load until the
lubricant is normally dispersed.

Our bevel gears can be used in any position, provided that the positions are specified at
the time of ordering. This will enable us to change the type and quantity of lubricant
which is necessary.

page 6 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

5. Installation procedures
• Before installing the bevel gear, carry out a visual inspection of housing to ensure
that there are no cracks or breakages due to incorrect handling or transport.
• To mount our bevel gears on valves or sluice gates, use the flange sizes specified in
our catalogue.
• To move or install our bevel gears we can provide the attachments shown in Fig. 3,
provided that these are ordered by the customer. These attachments should only be
used for moving or installation of bevel gears. The valve or any other accessory
connected to the bevel gear, should never be lifted using the bevel gear as lifting
device, or through the bevel gear itself.

Ensure that (see fig. 2):

• the diameter d2 and the depth c2 are sized according to table 2 (s. page 11) and
that they have the required tolerances.
• the diameter dI allows the stem to move free, without touching flange or bearing
parts. For bevel gears type R with a thrust bearing, dI must be as follows:

dl = Max. shaft Ø + 15mm

Type AS bevel gears

• In order to be able to machine the stem nut, remove it as well as the O-ring (pos.
015) from the bevel gear.
After machining the stem nut, carefully replace O-ring and stem nut, taking care that
O-ring is not damaged. Application of a little grease on O-ring will make it easier to
slide the stem nut into position.

Type A(B)R bevel gears

• In order to be able to machine the stem nut, remove the thrust ring. Both thrust
bearings (pos. 012), four washers and the O-ring (pos. 013) including the stem nut
have to be removed. Be careful not to damage the O-rings.
Clean the washers and bearings, grease and reassemble them after machining the
stem nut. Re-insert thrust ring, O-ring and stem nut.
• To remove the stem nut of the BR type the stud screws (pos.017) needs to be
removed. After that the axial thrust ring (pos.016) could be unscrewed. The O-Ring
(pos.013) must not be damaged. To prevent an unlocking of the stud screws, safety
screws are installed behind them. Before disassembling, the safety screws need to
be removed.
• Take care not to damage the thrust bearing discs when installing gear box on valve.
• When assembly is completed, check if the stem nut freely turns and has an axial
tolerance of 0.2 to 0.3 mm.
• For bevel gears which are motorised, note that the stem nut fins must be inserted
into the small keyways of the bevel gear.
• For manual operation of bevel gear the stem nut fins can be placed into the wide
keyways (hammerblow effect), provided that this was specified in the order.

Operating instructions Bevel gear Boxes type A(B)R and AS page 7 of 16

DREHMO® Reliable Valve Operation

• At the BR type, the stem nut must run freely, a run under constrain or a huge
axial play is not allowed.

General

If an electrical actuator is assembled onto a motorisable bevel gear, check the depth of the
actuator seat and the length of the bevel gear shaft to ensure that the shaft will not be forced
inwards, damaging the radial support bearing.
To install and use motorised bevel gears with electric actuators, not only the instructions given
in this manual but also those in the electric actuator “instruction manual” must be followed.
Our bevel gears can be applied to valves, sluice gates and air lock for manual operation or for
operation with an electrical actuator.

If the bevel gear is used in any other way than described in this manual, unless approved in
our order confirmation, we will not take any responsibility whatsoever, for any consequent
injuries to persons or damage to equipment. It is the customers or users responsibility to
ensure that all the current safety regulations are followed; and it is his responsibility to provide
the necessary training for the personnel, which is considered to use and maintain the bevel
gears.

page 8 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

Operational characteristics for CML gear box selection and usage:

Table 1:

-Für die Bauform BR gelten die gleichen Leistungsdaten wie für die Bauform AR-

6. Routine maintenance
When the bevel gears have been installed, we suggest that they should be checked every six
months and recommend that the following operations are carried out:
• Carry out a complete opening and closing operation.
• The bevel gears are filled with a lifetime lubrication. During inspection of the gear box, we
recommend to check the grease level.
• Check and tighten the bolts holding it to the valve.
• Check and tighten the external bevel gear bolts, those attaching any electrical actuator and
those of the hand-wheel.
• Check the stem nut for any signs of wear and maybe replace it.
• Check the leak tightness of the shaft cover and the lubrication points.
• It is recommended to relubricate the bearing points once in a year with a sufficient amount
of grease.

Operating instructions Bevel gear Boxes type A(B)R and AS page 9 of 16

DREHMO® Reliable Valve Operation

7. Environmental specifications
Our bevel gears A(B)R and AS have several different specifications. The standard
design includes a special housing protection according to insulation class IP 65
(optional IP 67 or IP 68). The insulation protection is only achieved when the flange
surfaces of actuator and gear are accurately coated with a sealant (e. g. Curil K2, Co.
ElringKlinger AG) and connected to a standardized output drive. In a similar manner the
valve flange needs to be treated

The bevel gears ordered with a stem cover / shaft cover (with a position indicator), must have
an M10 hole 25 mm deep on the upper part of the valve stem. This is to be made by the
customer.
Bevel gears only have sealed protection if the stem protection is correctly assembled using
Teflon tape on the threaded part.

page 10 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

8. Spare parts
If the bevel gear is damaged and needs components to be replaced, the customer has to give
the order or serial number of the mounted actuator and the type to our After Sales Service, so
that the part required can be correctly identified (from time to time components may be
modified to improve the product).

Nur AS-Typ Nur AR-Typ

Fig 1 AS type only AR type only

BR-Type 017
BR type
Fig 1.1 011 016 013

Operating instructions Bevel gear Boxes type A(B)R and AS page 11 of 16

DREHMO® Reliable Valve Operation

Pos. Bezeichnung Designation Pos. Bezeichnung Designation

1 Gehäuse Housing 04 Kugellager Ball bearing
2 Kegelrad Wheel 05 Schraube und Scheibe Screw and washer
3 Anschlussvariante „S“ Coupling block “S” 06 O-Ring O-Ring
4 Buchse Bush 07 Passfeder Key
5 Axialkraft-Ring Thrust ring 08 Dichtung Gasket
6 Anschlussvariante „R“ Coupling block “R” 09 Schraube und Scheibe Screw and washer
7 Gewindebuchse Stem nut 010 Kugel Ball
8 Spindelschutzhaube Stem cover 011 O-Ring O-Ring
9 Ritzel Pinion 012 Axiallager Thrust bearing
10 Eingangsflansch Input flange 013 O-Ring O-Ring
11 Scheibe Spacer 014 W-Ring W-Ring
01 Lager Bearing 015 O-Ring O-Ring
02 Schmiernippel Grease inlet 016 Axialkraft-Ring B Typ Thrust ring B type
03 Dichtung Gasket 017 Stiftschraube Stud Screw

page 12 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

9. Design of valve flange

Mandatory design of the valve

flange

Fig. 2 If the valve flange geometry

dl = Max. shaft Ø + 15 mm differs, supply of an Adaptor
flange following this design rules
is optional possible
Table 2:
+0,2
Type c2 Ø d2 (H8) Ø Max. shaft
+0,4

mm mm mm
70
A(B)P1 3
60
A(B)03 3 70 40
A(B)04 3 70 40
A(B)11 4 100 45
A(B)13 4 100 60.5
A(B)24 5 130 70
A(B)25 5 130 70
A(B)33 5 200 85
A(B)43 5 230 102
A(B)70 5 260 115
A(B)90 5 260 122
A(B)110 140
8 300
A(B)110S 140
A(B)111 140
8 300
A(B)111S 140
370
A(B)300 8 200
470

Operating instructions Bevel gear Boxes type A(B)R and AS page 13 of 16

DREHMO® Reliable Valve Operation

10. Transport and lifting

Before lifting, fix a Before lifting, check

washer with proper screw to that stem nut is taken
avoid rope from slipping. out or is fixed with
proper locking screw.

Fig. 3

page 14 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS

 DREHMO® Reliable Valve Operation

Scope of supply of DREHMO®-actuators

Characteristic features for DREHMO® -Standard,

DREHMO®-Standard Matic C and i-matic:

Emergency operation via handwheel

• Conventional switches • Emergency operation via handwheel is possible
• 2 Limit switches without declutching the motor
• Therefore manual operation is possible even when
• 2 Torque switches the valve and the actuator are mechanically
• Flasher for running indication temporary seized
• Due the fact that a switch-over mechanism is not
required, motorized operation of handwheel is
possible via a powertool adapter

EMG enclosed motors

DREHMO® actuators are equipped with EMG
enclosed motors (3-phase asynchronous motor) as
standard. The motor housing is totally enclosed and
pressure-proof (EEx d). This design guarantees the
greatest possible protection against humidity and dust
ingress and is therefore suitable for operation in
extreme environmental conditions.Operating mode:
DREHMO®-Matic C Short-time duty S2 – 10 / 15 min; in modulating
operation, S4 intermittent service max. 30 % Ed.
Insulation class F.

Thermal protection for the motor

Three thermal switches connected in series are
• Contactless combisensor for Limit mounted in the motor windings. In case the motor
and Torque temperatures exceeds 155 °C the control circuit is
• Integral control unit interrupted. The contact which opens the unit is
integrated within the control unit.
• Simple setting by LEARN-Function
Gear principle
• Lifetime lubrication
• Manual operation via handwheel, changeover
mechanism not necessary
• No starting problems even at low temperatures
• Long lifetime for on-off duty as well as for
modulating duty due to low pressure at
surface of gear wheels in combination with
minimum friction of the meshing gears
• optimized lubrication
• Mounting and operation in any position possible

Operating functions
DREHMO® actuators consist mainly of motor,
planetary gear arranged with a torque-bearing
DREHMO®-i-matic displacement worm, handwheel without changeover
clutch, sensors for torque and position measurement
and an integral control unit.
All parts of the planetary gear are arranged around
the hollow shaft.

• „non-intrusive“ Due to the fact that there are always multiple teeth of
the planetary gear meshing - in contrast to a normal
• integral data memory for spur gear - a very compact gear design with a longer
operating data storage lifetime can be realized.
• remote parameterisation
• Field Bus interfaces

Operating instructions Bevel gear Boxes type A(B)R and AS page 15 of 16

DREHMO® Reliable Valve Operation

DREHMO GmbH
Industriestraße 1
57482 Wenden/Germany
Fon: +49 27 62 6 12-314
Fax: +49 27 62 6 12-476
Internet: www.drehmo.com
Email: drehmo@drehmo.com

page 16 of 16 Operating instructions Bevel gear Boxes type A(B)R and AS