
eHydroCOM - Electric Stepless Capacity Control System
Solve stepless control tasks now in seconds
Many reciprocating compressors need to deliver less than their rated capacity for much or all of the time. Traditionally, this requires excess compressed gas to be returned to the suction side via a recycle valve. The energy used to compress this recycled gas is wasted. HOERBIGER’s eHydroCOM is the most compact and all-electric stepless volume control system available today for reciprocating compressors. The 100 % oilfree and fully standardized system is the ideal way to achieve stable capacity control of dynamic processes.
The eHydroCOM continuously adjusts the compressor’s delivery rate to match the amount required by the downstream process. Precise control of the suction valves eliminates the need for a bypass. This not only saves you energy and reduces CO2 emissions, but also improves your process controls at the same time.

Conventional systems, such as step or bypass controls, do not work efficiently, are often slow and can only be adjusted with great effort and not accurate to the required delivery rate. The eHydroCOM system allows you a wide control range: Stepless from (0...)10* to 100 %. Due to the reverse flow control, the delivery rate is adjusted fully automatically and, above all, continuously. Thanks to the large control range and the possibility to operate your compressors more flexibly, you can cover requirements even with a smaller fleet, react extremely quickly and avoid overcapacities.
Test your energy savings here.
Failure prevention through real-time monitoring of the actuator
eHydroCOM offers a wide range of control: stepless turn down from 10–100% allows for rapid, automatic capacity adjustments. Thanks to the broad control range and the ability to run your compressors more flexibly, you can meet demand with a smaller fleet and avoid overcapacity.Digital networking allows you to monitor your actuator in real time and can thus detect failures at an early stage and avoid these in the best case. But not only that: Any problem that may arise can be can be solved with temporary access via remote maintenance. If spare parts are required, HOERBIGER always has semi-finished products ready for you – eliminating unnecessary storage costs for you.
Benefits at a glance
Reverse flow control: The delivery rate of the compressor adjusts continuously to the requirements of the process
No need for energy-wasting bypass valves
Reverse flow control: Wide control range, and ability to assign new duties to individual compressors
Flexibility in the compressor fleet and increased versatility
100% oil-free and all-electric operating principle
Less maintenance
Automatic wear compensation while compressor runs
Almost wear-free operation
Standardized system: “One size fits all”
Easy device exchange and use of existing spare parts
Standardized system: “One size fits all”
HOERBIGER always keeps semi-finished products ready
Connectivity
Digitalization (access to data)
Remote support
Faster service and lower travel costs through troubleshooting, e. g. via smartphone

- For medium force and medium speed applications
- Rugged and cost effective
- Low maintenance due to obsolete hydraulics
- Actuator
- Field Power Supply Unit (FPSU)
- Digital Compressor Interface (DCI)
- Bus & power cables
- Top Dead Center (TDC sensor)

- Unloading force:
- Medium, single stack actuator
- Max. compressor speed:
- 800 rpm
- Max. suction pressure:
- 70 bar a
- Automatic clearance compensation:
- yes
- Automatic wear compensation while compressor runs:
- yes
- IP
- Actuator: IP65
FPSU: IP65 - EX-certificates:
- ATEX Zone 1 IIC
- Electrical connection:
- Terminals
- Height/ weight:
- 267 mm/ 20.5 kg (NACE 23.5 kg)
- Power supply:
- Actuator: 60 VDC
FPSU input: 3 x 400 VAC - HydroCOM replacement:
- Partially (low pressure,
low speed, low force) - Separate enclosure required for FPSU/ ePU:
- No
- Maintenance intervals at 400 rpm:
- 32,000 operating hours
Gas seals: Depending on gas quality - Standardization:
- Same actuator for all stages/ compressors

- For high force, high speed and critical applications
- Most powerful and compact in size
- Efficiency made simple: Thanks to plug connectors and missing hydraulics
- Actuator
- Power Supply Unit (ePU)
- Compressor Interface Unit (eCIU)
- Bus & power cables
- Top Dead Center (TDC sensor)

- Unloading force:
- High, double stack actuator
- Max. compressor speed:
- 1,200 rpm
- Max. suction pressure:
- 160 bar a
- Automatic clearance compensation:
- yes
- Automatic wear compensation while compressor runs:
- yes
- IP
- Actuator: IP65
ePU: IP67 - EX-certificates:
- ATEX/ IECx Zone 1 IIC, CSA, TIS, KOSHA
- Electrical connection:
- Ex-connector
- Height/ weight:
- 232 mm/ 20.0 kg (NACE 23.0 kg)
- Power supply:
- Actuator: 560 VDC
ePU input: 3 x 400 VAC - HydroCOM replacement:
- All applications incl. Dia 17 mm high force
- Separate enclosure required for FPSU/ ePU:
- No
- Maintenance intervals at 400 rpm:
- 32,000 operating hours
Gas seals: Depending on gas quality - Standardization:
- Same actuator for all stages/ compressors


Brochure A4

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