Danfoss RSH 32, RSH 63, RSH 95, RSH 125 Data sheet

Data sheet

Oil Pump Type RSH Size 32, 63, 95, 125

Application RSH oil pumps are designed for small/medium

sized domestic and commercial oil burners up to
285 l/h.
The pumps have a built-in pressure regulator
with shut-off function.
A special regulation spring is available for feed/
transfer applications.

Function

Features

• Light and heavy oil

• 1 or 2-pipe operation

• 1-stage

• Built-in pressure regulator with shut-off

• Ring filter

• Special spring available for feed/transfer
applications

Pressure Suction Return

From the suction inlet (S) oil is drawn through the
gear set, where the pressure is increased. By
means of the piston and the spring in the pressure
regulator the pressure is kept constant at the value
set on adjustment screw (P1).
In 2-pipe systems the excess oil is led back to the
return outlet (R). In 1-pipe systems with plugged
return outlet (R) and removed by-pass screw (A),
the oil is returned internally to the gear set (see
figure).
When the pump is stopped the pressure drops
and the spring force in the pressure regulator will
move the piston until it seats and the oil flow is
shut off effectively.

Bleeding

In 2-pipe systems the pumps are self-priming, i.e.
bleeding is performed via the constriction (O) to
the return outlet (R).

In 1-pipe systems wi th plugged return outlet (R) and
by-pass screw (A) removed, bleeding must be
performed through the pressure gauge port (Pn).
In 1-pipe systems with underlying tank, the closing
function of the regulating valve must be rendered
inoperative. This is made by connecting the nozzle
line to the pressure gauge port (Pn) and plug the
pressure port (P). In this application a cut-off valve
must be installed in the nozzle line.

Warranty

For pumps used outside the stated technical data
and used with oil containing abrasive particles
Danfoss cannot give any warranty.

© Danfoss | 2019.03

BD.DA.P3.02 | 1

Data sheet Oil Pump Type RSH Size 32, 63, 95, 125

Identification Example:

RSH 63

Nozzle capacity at 20 cSt., 15 bar, 2800 min-1.

32 = Capacity 91 l/h
63 = Capacity 143 l/h
95 = Capacity 210 l/h
125 = Capacity 285 l/h

Technical data

RSH 32 63 95 125

Oil types Standard fuel gas oil, heavy oil and bio fuels
Viscosity range (measured

in suction inlet)

4.3 - 200 cSt. (mm²/s)

Filter area / mesh 75 cm² / 340 μm 170 cm² / 340 μm
Pressure range, stage 15-35 bar
Factory setting 21 ±1 bar
Max. pressure in suction

inlet/return outlet
Speed 1400-3450 min

4 bar

-1

Max. starting torque 0.22 Nm 0.25 Nm 0.30 Nm 0.35 Nm
Ambient temperature –20 to +120 °C
Storage temperature –25 to +120 °C
Temperature of medium –10 to +120 °C
Neck / Flange EN 225

Nozzle capacity Operating torque Power consumption

2 | © Danfoss | 2019.03

BD.DA.P3.02