HC78W versions: 2 different intensification factors
PIN: 20-207 bar
PH: 1,380 bar maximum for media > 5 cSt (mm2/s)
PH: 1,035 bar maximum for media < 5 cSt (mm2/s)
PRETURN: As low as possible (return pressure to tank)
POUTLET: PH = (PIN – PRETURN) x intensification factor
Mounting: Inline tube
Weight: 5.4 kg.
The HC78W is a very compact low leakage miniBOOSTER stainless steel 316L steel unit capable of delivering pressure up to 1,380 bar weighing only 5.4 kg. It is ideal for use in applications that require minimal standby oil consumption, such as control systems in the oil industry driven by solar panels, where energy consumption must be kept at a minimum.
The HC78W incorporates a 2/2 directional valve controlled with a pilot signal from the high-pressure side, simply cutting off pump supply when the high pressure is obtained and activates again when high pressure drops.
The HC78W raises supplied pressure to a higher outlet pressure and automatically compensates for consumption of oil to maintain the high pressure. Adjustment of the outlet pressure is carried out by varying the supplied pressure. With a selection of different high-pressure adapters, a variety of threads can be obtained from the M22x1.5 thread in the HP port.
|Max. intensified outlet flow|
|Max. inlet flow|
The basic operation is illustrated in the function diagram. Oil is fed through the directional valve CV to the IN port, flowing freely through the low leakage valve, the internal 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.
When end pressure is reached, the low leakage valve cuts off the inlet flow to the booster minimising leakage from the pump to the tank. If a pressure drop on the high-pressure side occurs due to consumption or leakage, the low leakage valve will open and activate the oscillating pump unit to maintain the end pressure.
Function diagram A- and B-model
Function diagram G-model
Dimension drawing 78W-121-00
|Connection||IN / R||H|
|1||1/4" BSPP||M22 x 1.5|
High-pressure adapter ordering codes and specifications are shown in the PDF-file: 7W-900-08
Fluids and materials
Additional information is available on the website under Products → General specifications.
Ordering an HC78W
Ordering example of an HC78W with i = 4.0, H1 M22 x 1.5 and H2 9/16-18 UNF, DV incorporated and BSPP connections:
HC78W – 4.0 – B – 12 for media < 5 cSt (mm2/s) tested in water
HC78W – 4.0 – B – 12S for media > 5 cSt (mm2/s) tested in hydraulic oil
High-pressure adapter is required, please specify ordering code – see high-pressure adapter table.
High-pressure adapters will be factory mounted.
The G-model is available in 2 variants, when ordering please specify accordingly:
- Dynamic – low hysteresis: Ordering example of an HC78W with i = 4.0 RV incorporated, H1 M22 x 1.5 and H2 9/16-18 UNF and BSPP connections: HC78W – 4.0 – G – 12S
- Fail safe – high hysteresis: The RV valve opening ratio is to be determined on individual basis. Contact our technical support. Ordering example of an HC78W with i = 4.0 RV with opening ratio x.x incorporated, H1 M22 x 1.5 and H2 9/16-18 UNF and BSPP connections: HC78W – 4.0 – G – x.x – 12S
- Select factor
- See flow rate table
- Select type
- A = without DV
- B = with DV
- G = with proportional valve
- Select thread
- 1_ = BSPP, media < 5 cSt
- 1_S = BSPP, media > 5 cSt
|Ordering code||IN / R||H1||H2||H3|
|HC78W-___-__-11||1/4" BSPP||M22 x 1.5||-||-|
|HC78W-___-__-12||1/4" BSPP||M22 x 1.5||9/16-18 UNF||-|
|HC78W-___-__-13||1/4" BSPP||M22 x 1.5||9/16-18 UNF||9/16-18 UNF|
Max. tightening torque BSPP
|IN / R|
|with stainless steel washer||4.0 da/Nm|