Why Two Pump Units
The SDRB-N is an electric grease station built with two plunger pump units: one runs as the duty pump while the other stands ready as standby. The point is continuity, not output. A running pump can be taken for service while the standby carries the plant, so the lubrication system outlasts any single pump unit. Do not confuse this with a dual-line system: dual-pump means two pump units for standby redundancy, while dual-line means two distribution mains that are pressurized in turn. Those are completely different things, and this station can pair with either arrangement depending on the valves downstream.
SDRB-N Model Table
| Model | Flow | Reservoir | Motor |
|---|---|---|---|
| SDRB-N variant, small | 60 mL/min | 20 L | 0.37 kW |
| SDRB-N variant, medium | 195 mL/min | 35 L | 0.75 kW |
| SDRB-N variant, large | 585 mL/min | 90 L | 1.5 kW |
All variants share a 31.5 MPa system pressure rating, a 42 MPa relief valve, and a 380 V three-phase supply, and all handle grease from NLGI 000, the softest grade, to NLGI 2. Match the variant to the total metered demand of the points it serves, not simply to the number of points.
How Duty and Standby Work
In normal operation the duty pump unit feeds the system alone and the standby unit waits. When the duty pump stops, whether by fault or for service, continuity comes from the standby, but the exact switching behavior depends on the control arrangement ordered with the station. Some arrangements switch to the standby automatically, others flag the stop for an operator to handle. Confirm the standby switching logic when ordering so the station matches your plant practice. A standby pump does not double the flow: only one unit feeds the system at a time.
Reservoirs and Reducer Oil
Reservoir choices track the model table: 20 L on the 60 mL/min unit, 35 L on the 195 mL/min unit, and 90 L on the 585 mL/min unit. Size the reservoir for refill convenience as much as for capacity, because a bigger tank means fewer drum changes per shift. Each station has a reducer between motor and pump, lubricated with N220 gear oil. Check the reducer oil level on the same walkdown as the reservoir level, and top up with the same grade.
Where These Stations Serve
These stations suit continuous multi-point plants where a stopped lubrication pump means a stopped line: steel works, cement plants, ore handling, and large press lines. The duty-standby layout fits sites where maintenance windows are short and lubrication must continue while one pump unit is worked on. For lighter plants, or where a stop for pump work is tolerated, a single-pump DRB-P electric grease pump station may be enough. To weigh single-pump against dual-pump for your plant, use our quote request page.
Related System Components
The station feeds dual-line systems through a SYP hydraulic reversing valve, which alternates the two mains with no external controller. Electrically shifted systems use the 24EJF-P reversing valve instead. Downstream, SDPQ metering valves dose each lubrication point, and smaller single-pump builds start from an electric grease pump.
Frequently Asked Questions
Why does the station have two pump units?
For continuity: one unit runs as duty while the other stands ready as standby. The running pump can be serviced while the standby carries the plant.
What happens if the duty pump fails?
Continuity then depends on the standby switching arrangement ordered with the station. Some arrangements switch automatically, others flag the stop for an operator, so confirm when ordering.
Does the standby pump double the flow?
No, only one unit feeds the system at a time. The standby is for continuity, not added output.
What is the difference between dual-pump and dual-line?
Dual-pump means two pump units for standby redundancy. Dual-line means two distribution mains pressurized in turn, which is a completely different thing.
Which reservoir size should I choose?
The 20 L, 35 L, and 90 L reservoirs pair with the 60, 195, and 585 mL/min variants. Match flow to the total metered demand of the points served.
What oil does the reducer need?
The reducer is lubricated with N220 gear oil. Check its level on the same walkdown as the reservoir.
Does it need an external controller?
No, the hydraulic reversing valve alternates the distribution mains without one. Electrically shifted systems use a solenoid reversing valve instead.
What does the 42 MPa relief mean?
The station works at 31.5 MPa system pressure, and the relief opens at 42 MPa. That ceiling sits above the working rating so the relief clears pressure spikes.
Where are these stations used?
Continuous multi-point plants: steel works, cement, ore handling, and large press lines. For a layout review of your plant, use our quote request page.
Who builds the SDRB-N?
IsoHiTech Lubrication Systems, founded in 2023, engineering since 2006, builds and supports every unit. Email inquiry@isohitech.com for specifications and a quotation.
