Primary reduction gearing
Primary reduction gearing Planetary gear with various reduction ratios for reducing the input torques
Valve attachment
Valve attachment Dimensions according to SP 101
Standard: GS 50.3 – GS 125.3: without spigot
GS 160.3 – GS 250.3: without spigot
Options: GS 50.3 – GS 125.3: with spigot
GS 160.3 – GS 250.3: with spigot
Splined coupling for connection
to the valve shaft
Standard: without bore or pilot bore from GS 160.3
Worm gearbox can be repositioned 4 x 90° on coupling
Options: Machined with bore and keyway, square bore or bore with two-flats
Service conditions
Enclosure protection according
to EN 60 529
6)
Standard: IP 68-3, dust and water tight up to max. 3 m head of water
Options
7)
: IP 68-6, dust and water tight up to max. 6 m head of water
IP 68-10, dust and water tight up to max. 10 m head of water
IP 68-20, dust and water tight up to max. 20 m head of water
Corrosion protection Standard: KN Suitable for installation in industrial units, in water or power plants
with a low pollutant concentration
Options: KS Suitable for installation in occasionally or permanently aggressive
atmosphere with a moderate pollutant concentration
(e.g. in wastewater treatment plants, chemical industry)
KX Suitable for installation in extremely aggressive atmosphere
with high humidity and high pollutant concentration
Paint Standard: GS 50.3 – GS 125.3: Two-component iron-mica combination
GS 160.3 – GS 250.3: Two-component iron-mica combination
Color Standard: Grey (DB 702, similar to RAL 9007)
Option: Other colors on request
Ambient temperature Standard: – 20 °F to + 175 °F/ – 25 °C to + 80 °C
Options: – 40 °F to + 140 °F/ – 40 °C to + 60 °C (low temperature), version L
– 75 °F to + 140 °F/ – 60 °C to + 60 °C (extreme low temperature), version EL
+ 32 °F to + 250 °F/ – 0 °C to + 120 °C (high temperature), version H
Lifetime Open-close duty: The lifetime is based on a load profile typical for part-turn valves
Modulating duty: min. 2.5 million operations
8)
6) Refer to section enclosure protection IP 68
7) Not available for GS 50.3
8) With worm wheel made of spheroidal cast iron
9) The lifetime for modulating duty depends on the load and the number of starts. A high starting frequency will rarely improve the modulating accuracy. To reach the
longest possible maintenance and fault-free operation time, the number of starts per hour chosen should be as low as permissible for the process
5
Operation instructions Worm gearboxes GS 50.3 – GS 250.3
Type Operating cycles (OPEN - CLOSE - OPEN)
for swivel movements of 90° (max. 100°)
and a maximum output torque of
100 % 140 % 175 %
8)
200 %
9)
GS 50.3 15,000 5,000 – 1,000
GS 63.3 15,000 5,000 – 1,000
GS 80.3 15,000 5,000 – 1,000
GS 100.3 15,000 5,000 – 1,000
GS 125.3 15,000 5,000 – 1,000
GS 160.3 15,000 5,000 1,000 –
GS 200.3 15,000 5,000 1,000 –
GS 250.3 10,000 3000 750 –
(32 pages)
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