HC21 versions: 15 different intensification factors
PIN: 20–207 bar
PH: 800 bar maximum
PRETURN: As low as possible (return pressure to tank)
POUTLET: PH = (PIN – PRETURN) x intensification factor
Mounting: Inline tube
Weight: 3.2 kg.
B model = with dump valve
Material certificate 3.1 on request
The HC21 is a compact unit weighing only 3.2 kg. It is ideal for use in a variety of applications where building and maintaining high pressure is required.
The HC21 incorporates a directional control valve (DCV) to control inlet pressure to the booster section, and an optional orifice to reduce inlet flow to the maximum allowed for the intensification ratio selected. Both manually operated and solenoid-operated valves are available.
The HC21 raises supplied pressure to a higher outlet pressure and automatically compensates for oil consumption to maintain the high pressure. Adjustment of the outlet pressure is carried out by varying the supplied pressure.
|Max. intensified outlet flow|
|Max. inlet flow|
The basic operation is illustrated in the function diagram. When the DCV valve (pos. 3) is activated to parallel position, oil is fed from the pump to the IN port, flowing freely through the internal check valves to the high-pressure side H.
When pump pressure is reached on the high-pressure side H, the internal check valves will close. The end pressure will be built up by the oscillating pump unit OP. The unit will automatically stall when end pressure on the high-pressure side H is reached. If the pressure drops on the high-pressure side, due to consumption or leakage, the OP valve will automatically oscillate to maintain the end pressure.
When the job is done and the pressure has to be relieved again, the DCV valve has to be set in cross position. The pump pressure will pressurise the Z port, and the built-in valve DV is activated and thereby relieves the high-pressure side, and oil returns to the tank.
Function diagram HC21 with DCV type “H”
Function diagram HC21 with DCV type “h”
Function diagram HC21 with DCV type “4/2”
Dimensions with solenoid operated valve
Dimension drawing 2-141-02
Dimensions with manually operated valve
Dimension drawing 2-142-02
Dimensions with solenoid operated valve + side ports H2/H3
Dimension drawing 2-152-00
Dimensions with manually operated valve + side ports H2/H3
Dimension drawing 2-153-00
|Connection||IN / R||H1||H2||H3|
|1||1/4" BSPP||1/4" BSPP||-||-|
|12||1/4" BSPP||1/4" BSPP||1/4" BSPP||-|
|13||1/4" BSPP||1/4" BSPP||1/4" BSPP||1/4" BSPP|
Fluids and materials
Additional information is available on the website under Products → General specifications.
Ordering an HC21
Ordering example of an HC21 with i = 4.0 DV incorporated, BSPP connections, H2 side port and manually operated directional control valve type H:
HC21 – 4.0 – B – 12 – 01
HC21 is as standard mounted with 12VDC coil. Other voltage available on request.
- Select factor
- See flow rate table
- Select type
- B = with DV
- See table above
Directional control valve
- Select type
- 01 = Manual H
- 02 = Manual h
- 09 = Manual 4/2
- 11 = Solenoid H
- 12 = Solenoid h
- 19 = Solenoid 4/2
Max. tightening torque BSPP
|IN / R / Z||H1 / H2 / H3|
|1/4" BSPP||1/4" BSPP|
|with steel washer||4.0 da/Nm||4.0 da/Nm|
|with cutting edge||4.0 da/Nm||4.0 da/Nm|