What Is the HAWK HCPX 500 Bar Plunger Pump?
The HAWK HCPX series is a bare-shaft triplex plunger pump that delivers 15 or 22 L/min at a rated 500 bar (50 MPa / 7250 psi) and 1450 rpm. As a 500 bar plunger pump it is supplied as a pump head and crankcase assembly, not as a complete machine: the buyer provides the motor, coupling, frame, unloader valve and hose. WINGSPAN TECH TAIZHOU CO., LTD., based in Taizhou, Zhejiang, China, supplies the HCPX1550R and HCPX2250R as HAWK original pumps for OEM builders and cleaning equipment manufacturers.
Both HCPX models carry a 500 bar maximum pressure rating. The 15 L/min version is the HCPX1550R. The 22 L/min version is the HCPX2250R. Both versions run at 1450 rpm. Maximum water temperature is 65 deg C (149 deg F). Pump weight is 20.3 kg. Oil capacity is 1.5 L. Plunger diameter is 24 mm on both models.
The catalogue positions this series for portable washing systems and for compact industrial cleaning equipment where work intensity is lower and a small footprint with low cost of ownership matters (HAWK Product Catalogue 17). That positioning is a boundary, not a marketing phrase: the HCPX is not specified for continuous heavy industrial duty, and the manual does not publish a continuous duty rating. Values on this page come from the HAWK product catalogue, page 17, and the HCPX1550R / HCPX2250R Technical Sheet, version 2026-07-15. Where a value is not published, this page says so rather than estimating it.
Pump Head, Ceramic Plungers and Crankcase Construction
This 500 bar plunger pump uses a nickel-plated pump head with a special brass alloy body, ceramic plungers, stainless steel check valves and an aluminium crankcase housing. The catalogue quotes 97 percent volumetric efficiency for the series and lists reinforced crankshaft and connecting rods among the standard features (HAWK Product Catalogue 17). The parts list confirms three ceramic plungers, six check valve assemblies and three Parker main water seals (Hawk Trading (Suzhou) Co., Ltd. 2026). A three-plunger layout is the reason the flow is quoted at 1450 rpm rather than at a variable speed.
Nickel-Plated Pump Head and Valve Caps
The front of the pump head shows three vertical valve housings, each closed by a hexagonal cap, plus a row of socket-head bolts across the flange. The silver cast finish in the product photos is the nickel-plated surface described in the catalogue. Six hexagon valve caps and a central bronze-coloured plug are visible on the front face. The inlet and outlet ports are listed as 1/2 in and 3/8 in; which dimension belongs to which port is to be confirmed against the original drawing, so this page does not assign them.
Ceramic Plungers and Parker Water Seals
Ceramic plungers resist wear and corrosion in high-pressure water duty, and the catalogue pairs them with Parker main and secondary water seals using a formed lip profile intended to prevent seepage (HAWK Product Catalogue 17). The parts list names three Parker fabric-reinforced main seals, three secondary seals, three O-rings of 35 x 1.8 mm NBR70 and three ceramic plungers. Stainless steel check valves are fitted, six in total, with three plugs and one G1/4, one G1/2 and one G3/8 stainless steel blanking plug (Hawk Trading (Suzhou) Co., Ltd. 2026). These are replaceable service items, not lifetime components.
Black Crankcase Cover and Solid Output Shaft
A black moulded cover encloses the crankcase, with a round side cover held by four bolts and an oil sight glass at the centre. A red breather or filler cap sits on the top face. The solid output shaft protrudes from the drive end, which is why the Technical Sheet labels this build as the bare-shaft or external-shaft version. Shaft diameter, flange pattern, rotation direction and key dimensions are to be confirmed from the dimension drawing before a coupling is ordered; no shaft size is published on this page.
What Pressure, Flow and Water Temperature Can the 500 Bar Plunger Pump Handle?
The rated working point is 500 bar (50 MPa / 7250 psi) at 1450 rpm, with a choice of 15 L/min (about 4.0 gpm) or 22 L/min (about 5.8 gpm). Water temperature must stay at or below 65 deg C (149 deg F). The catalogue contains two temperature footnotes for this same limit, 149 deg F in the Chinese text and 150F in the English text; 65 deg C converts to 149 deg F, so 149 deg F is used consistently here. Pressure and flow cannot both be raised without a larger drive, and the pump must never be run against a closed outlet.
Hydraulic Power Check at 500 Bar
For a 500 bar plunger pump, hydraulic power in kW is approximately pressure in bar multiplied by flow in L/min, divided by 600. Applying that rule to the two HCPX versions gives a quick check on the catalogue shaft power figures:
- HCPX1550R: 500 x 15 / 600 = 12.5 kW of hydraulic power, against 14.3 kW (about 19.2 HP) of published shaft power.
- HCPX2250R: 500 x 22 / 600 = 18.33 kW of hydraulic power, against 20.8 kW (about 27.9 HP) of published shaft power.
The gap between hydraulic power and shaft power is mechanical and volumetric loss, roughly 12.6 percent on the 1550R and 11.9 percent on the 2250R. These are two different quantities, not a contradiction in the table. A drive selected only on the 12.5 kW hydraulic figure would be undersized. Use the 14.3 kW or 20.8 kW shaft rating, then add the service margin required by the motor and coupling supplier.
Water Temperature and Duty Cycle Limits
65 deg C (149 deg F) is the published ceiling, so steam cleaning, hot-water pressure washing above that limit and thermal degreasing with hotter feed water are outside this pump’s rating. The catalogue also states the series suits work of lower intensity, which makes continuous 24-hour duty an application to be confirmed with the supplier rather than assumed. Abrasive-laden water, chemical dosing without seal compatibility checks and dry running are not covered by the published data. Filtration on the inlet side is required; a wire braided hydraulic hose on the discharge side must be rated above 500 bar with a suitable safety factor.
500 Bar Plunger Pump Specification Table: HCPX1550R and HCPX2250R
Both versions of this 500 bar plunger pump share the same pressure rating, 1450 rpm speed, 24 mm plunger, 20.3 kg weight and 1.5 L oil capacity. They differ in flow, shaft power and part number. All values below are transcribed from the catalogue table and the Technical Sheet; gpm, MPa, psi and HP are conversions using 1 MPa = 10 bar, 1000 bar = 14500 psi and 1 kW = 1.34 HP.
| Model | Flow L/min | Flow gpm | Pressure bar | Pressure MPa | Pressure psi | Speed rpm | Shaft power kW | Shaft power HP | Part number |
|---|---|---|---|---|---|---|---|---|---|
| HCPX1550R | 15 | 4.0 | 500 | 50 | 7250 | 1450 | 14.3 | 19.2 | 9.220-138.0 |
| HCPX2250R | 22 | 5.8 | 500 | 50 | 7250 | 1450 | 20.8 | 27.9 | 9.220-104.0 |
Common specifications: maximum water temperature 65 deg C (149 deg F); weight 20.3 kg; oil capacity 1.5 L; plunger diameter 24 mm; inlet and outlet 1/2 in and 3/8 in, assignment to be confirmed; nickel-plated head; ceramic plungers; aluminium housing. Burst pressure, maximum inlet pressure, suction lift, noise level, dimensions and continuous duty rating are Not published on this page. The same pressure class appears in our 12-28 L/min 500 bar plunger pump range, which uses different JPDH models and a different flow spread.
Applications and How to Select a 500 Bar Plunger Pump
Selection starts from the required cleaning duty, not from the pump size. The catalogue names two target uses for the HCPX: portable washing systems, and compact industrial cleaning equipment where moderate work intensity makes the small build and low cost of ownership decisive (HAWK Product Catalogue 17). A bare-shaft pump is an OEM component, so the machine builder also needs a drive, a coupling, an unloader valve, a gauge, a hose, a trigger gun and nozzles. Buyers wanting a ready-to-run unit should look instead at a complete electric pump motor unit or a finished 500 bar high pressure cleaner.
When to Choose the 15 L/min HCPX1550R
The 15 L/min version suits a single-operator portable washer, a compact test bench or a light wash-down station where water consumption and drive size are limited. At 500 bar it needs 14.3 kW of shaft power, so a smaller motor frame and a lighter coupling can be used than on the 22 L/min version. Impact pressure is the same on both models; the difference is coverage per minute. Pair it with a flexible coupling matched to the confirmed shaft diameter, and a trigger gun with a 3/8 in swivel inlet on the operator end.
When to Choose the 22 L/min HCPX2250R
The 22 L/min version suits faster rinsing, larger surface area per pass and multi-nozzle heads, at the cost of 20.8 kW shaft power. It is the better match where two operators or a wider surface cleaner must be fed at 500 bar. Nozzle sizing follows the flow: quick connect nozzle tips must be selected for 22 L/min at 500 bar, and a 3/8 in swivel fitting helps control hose torque. For higher pressure classes, see the 800 bar water blasting machine and the 1000 bar water blaster; those are different machines, not HCPX variants.
This 500 bar plunger pump is not recommended where a self-contained machine with motor and frame is required, where feed water exceeds 65 deg C, where continuous 24/7 duty is specified without written confirmation, or where the process needs a pressure above 500 bar. For lower pressure duties with ceramic plungers, compare the ceramic plunger pump rated to 25 MPa, the 11-30 L/min 350 bar car washer pump, the piston pump range and the Pratissoli KF series. These links are alternatives, not interchangeable spare parts.
Installation, Oil Service and Safety for the 500 Bar Plunger Pump
The crankcase of this 500 bar plunger pump is filled with Shell R3 Turbo 15W-40 heavy-duty multigrade oil, 1.5 L capacity, and the Technical Sheet states oil maintenance-free operation for 1500 hours or 1 year (Hawk Trading (Suzhou) Co., Ltd. 2026). Check the oil level through the sight glass before first start and at the scheduled interval. Confirm shaft alignment, rotation direction and flange fit before coupling the drive, and never throttle the suction line to reduce flow; use a bypass or unloader valve instead. A positive-displacement pump will keep building pressure against a closed gun, so a pressure relief or unloader valve is mandatory.
| Service kit | Part number | Contents | Quantity per pump |
|---|---|---|---|
| Water seals kit | 24001011 | Parker main water seal, O-ring 35 x 1.8, Parker secondary water seal | 3 + 3 + 3 |
| Oil seals kit | 24001013 | Reciprocating oil seal 20 x 30 x 7, O-ring, rotary oil seal | 3 + 2 + 1 |
| Valves kit | 24001014 | Check valve assembly | 6 |
Kit part numbers and quantities come from the HCPX Technical Sheet parts list (Hawk Trading (Suzhou) Co., Ltd. 2026). The same list identifies the nickel-plated head as part 22021056, the ceramic plunger as 22021057 and the crankcase as 22060272. Ordering by kit number is more reliable than ordering individual seals, because the lip profile of the main and secondary seals is matched as a set. As of 2026 the supplier has not published a recommended spare-parts stock level on this page.
- Verify the 1450 rpm drive speed against the motor nameplate before energising; running faster changes both flow and shaft power.
- Fit inlet filtration and a flooded or short suction line. Cavitation damages ceramic plungers and water seals.
- Fit an unloader or relief valve set no higher than 500 bar (50 MPa / 7250 psi) and a gauge readable from the operator position.
- Keep feed water at or below 65 deg C (149 deg F). Do not run the pump dry.
- Use a hose, fittings and gun rated above 500 bar; inspect seals and check valves at the first sign of pressure loss.
- Shaft diameter, flange pattern and rotation direction are to be confirmed before selecting a coupling.
Frequently Asked Questions
What is the maximum pressure of the HAWK HCPX pump?
The rated maximum is 500 bar, equal to 50 MPa or about 7250 psi, on both the HCPX1550R and the HCPX2250R.
What is the difference between HCPX1550R and HCPX2250R?
The HCPX1550R delivers 15 L/min at 14.3 kW shaft power with part number 9.220-138.0. The HCPX2250R delivers 22 L/min at 20.8 kW with part number 9.220-104.0. Pressure, speed, weight and plunger diameter are the same.
Can the HCPX pump be used with hot water?
Yes, up to 65 deg C (149 deg F) feed water. Above that temperature the pump is outside its published rating, and a dedicated hot-water machine should be specified instead.
Does the pump come with a motor?
No. This is a bare-shaft pump with a solid output shaft. The motor, coupling, frame, unloader valve, hose and gun are supplied separately by the machine builder.
What oil does the HCPX use and when is it changed?
Shell R3 Turbo 15W-40 multigrade oil, 1.5 L capacity. The Technical Sheet states 1500 hours or 1 year of maintenance-free oil operation; check the level through the sight glass before first start.
Which maintenance kits fit the HCPX series?
For the 500 bar plunger pump, water seals kit 24001011, oil seals kit 24001013 and valves kit 24001014. The last contains six check valve assemblies, matching the three-plunger head.
The 500 bar plunger pump described here is a HAWK original product supplied by WINGSPAN TECH TAIZHOU CO., LTD. from Taizhou, Zhejiang, China, with two flow versions documented as of 2026. For a quotation, state the model, the drive speed, the feed water temperature and the intended duty cycle; dimensions, shaft interface and any value marked Not published or to be confirmed will be supplied against the original drawing rather than estimated here. Buyers comparing complete machines can review the 500 bar cleaner or the other 500 bar plunger pump models in the same catalogue.
