HC4W versions: 11 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: 4.5 kg.

Model versions:

A model = no dump valve
B model = with dump valve
G model = direct proportionally controlled

Material certificate 3.1 on request


The HC4W is a compact miniBOOSTER stainless steel 316L unit weighing only 4.5 kg, but it delivers up to 7.0 l/min outlet flow. The HC4W is ideal for use in applications where a higher volume of high-pressure fluid is required. 

Like the HC2W, it raises supplied pressure and automatically compensates for consumption of media to maintain the high pressure. Adjustment of the outlet pressure is carried out by varying the supplied pressure relative to its flow capability.

Flow rates

Intensification factor
Max. intensified outlet flow
Max. inlet flow


The basic operation is illustrated in the function diagram. Water is fed through the directional valve CV to the IN port, flowing freely through the check valves KV1, KV2 and DV to the high-pressure side H. In this condition maximum flow through the booster is achieved giving a fast-forward function.

When pump pressure is reached on the high-pressure side H, valves KV1, KV2 and DV will close. The end pressure will be achieved by the oscillating pump unit OP. The unit will automatically stall when end pressure on the high-pressure side H is reached. If a pressure drop on the high-pressure side exists due to consumption or leakage, the OP valve will automatically operate to maintain the end pressure.

Function diagram



Dimension drawing 4W-120-01

Connection types

ConnectionIN / RH
13/8" BSPP1/2" BSPP

Fluids and materials

Additional information is available on the website under Products → General specifications.

Ordering an HC4W

Ordering examples of an HC4W:

with i = 4.3, DV incorporated with BSPP connections for media < 5 cSt (mm2/s) tested in water: HC4W – 4.3 – B – 1

with i = 4.3, DV incorporated with BSPP connections for media > 5 cSt (mm2/s) tested in oil: HC4W – 4.3 – B – 1S

Attention note!
The G-model is available in 2 variants, when ordering please specify accordingly:

  • Dynamic – low hysteresis: Ordering example of an HC4W with i = 4.3 RV incorporated and BSPP connections: HC4W – 4.3 – G – 1
  • Fail safe – high hysteresis: The RV valve opening ratio is to be determined on individual basis. Contact our technical support. Ordering example of an HC4W with i = 4.3 RV with opening ratio x.x incorporated and BSPP connections: HC4W – 4.3 – G – x.x – 1


  • HC4W

Intensification, i

  • Select factor
  • See flow rate table

Model version

  • Select type
  • A = without DV
  • B = with DV
  • G = with proportional valve


  • Select thread
  • 1   = BSPP, media < 5 cSt
  • 1S = BSPP, media > 5 cSt

Max. tightening torque BSPP

3/8" BSPP1/2" BSPP
with stainless steel washer6.0 da/Nm13.0 da/Nm