Chapter 2
Compressor Specifications and Structure
UD-series Screw Compressors
2.1 Features of UD-series Screw Compressors
2-1
Chapter 2 Compressor Specifications and Structure
2.1 Features of UD-series Screw Compressors
UD-series Screw is a single-stage screw compressor classified into a rotary
displacement pump type, and it consists of the following features.
High Efficiency
The UD-series has achieved high efficiency by applying "
original O-profile screw
robes with the minimum leakage".
In addition, the UD-series provides economical operations due to its variable capacity control
mechanism, which well follows the load variation.
Responding to a Wide Range Condition
In the UD-series compressors, there are six types of rotor lobe diameter, and each rotor has three
types of shaft length (320 is 4 types, 400 is 5 types) as a standard specification.
With these features, the UD-series compressor is providing a high versatility that can satisfy a wide
range of operation conditions required by different applications at the load side.
High Reliability
The UD-series has extended the long span continuous operation without compressor overhauling
because of the following features:
Radial sleeve bearings specially designed with
’s original technology, special
high-load capacity thrust ball bearings, and a bellows type mechanical seal assembly.
Furthermore, from December 2014 Moriya factory production, the UD-series models have
employed the new type unloader indicator assembly with the protection grade IP66 of the dust and
water proof, at the same timing, have installed a durable conductive plastic potentiometer as the
standard inner component of the indicator.
Because of this improvement, the UD-series has equipped with further high reliability.
Less Vibration/Noises
The O-profile rotors along with other various design considerations have reduced noise and
vibrations further.
