4220 UNx Bareshaft Pump - #11 Plungers

Part No: 54730

With input power up to 324 hp (242 kW), this 4220 UNx® bareshaft pump will flow up to 25.1 gpm (95 l/min) at up to 20,000 psi (1400 bar).

The Jetstream model 4220 waterblast pump is the most advanced and efficent waterblast pump of its size in the industry. Combining the strength and durability of a proven power end workhorse with the unparalled simplicity, serviceability, and versatility of the UNx fluid end desigh, Jetstream bareshaft pumps are the best choice for those building their own system or replacing a complicated, worn, or unreliable pump.

UNx Fluid End Features

  • Superior performance
  • Greater flexibility in the field
  • Reduced downtime and maintenance


UNx Power End Features

  • Ductile iron power frame is the strongest in the industry
  • Heat treated billet alloy steel crankshaft
  • Largest bearing of any comparable pump on the market
  • Three Plunger (triplex) design
Model Name 4220
Maximum Power (hp) 324
Maximum Operating Pressure (psi) 20000
Maximum Flow (gpm) 25.1
Minimum Flow (gpm) 7.3
Maximum Power (kW) 242
Maximum Operating Pressure (bar) 1400
Maximum Flow (l/min) 95
Minimum Flow (l/min) 28
Plunger Size #11
Plunger Diameter (in) 1.062
Plunger Diameter (mm) 26.97
Number of Plungers 3
Plunger Stroke (in) 4.25
Plunger Stroke (mm) 108
Discharge Port Connection Jetstream 20K Port Female
Accessory Port Connections Jetstream 20K Port Female
Number of Accessory Ports 3
Suction Port Connection 2"NPT Female
Minimum Pump Speed (RPM) 150
Maximum Pump Speed (RPM) 514
Maximum Plunger Load (lbs) 17750
Maximum Plunger Load (N) 78950
Flow at 150 RPM (gpm) 7.3
Flow at 200 RPM (gpm) 9.8
Flow at 300 RPM (gpm) 14.7
Flow at 400 RPM (gpm) 19.6
Flow at 500 RPM (gpm) 24.5
Flow at 514 RPM (gpm) 25.1
Flow per Revolution (gal/rev) 0.0489
Flow at 150 RPM (l/min) 28
Flow at 200 RPM (l/min) 37
Flow at 300 RPM (l/min) 56
Flow at 400 RPM (l/min) 74
Flow at 500 RPM (l/min) 93
Flow at 514 RPM (l/min) 95
Flow per Revolution (l/rev) 0.185
Power End Model 4200
Oil Type 80W-90
Oil Capacity (gal) 9
Oil Capacity (l) 34
Weight (lbs) 1800
Weight (kg) 820

UNx Conversion Video

This video highlights the ease of maintenance and pressure convertibility of Jetstream UNx Pump. (3:59)

4200 UNx Fluid Ends

Increase the range of available operating pressures for any Jetstream 4200 UNx Pump with additional fluid ends. Conversions take only minutes and are available for pressures up to 40,000 psi (2750 bar).

20K Bypass Valve - Pump Mount

A bypass valve diverts a portion of pump flow to a low- pressure outlet and is used to prevent bogging of diesel engines when using flows at the low end of the pump’s capability or to adjust pressure on electric motor driven systems.  20,000 psi (1400 bar).  Pump-mounted.

20K Handle-Adjustable Regulator

Maintains constant system pressure when operating one or more shut-in devices. Knob-adjustable. Field-replaceable valve cartridge. For operation at 15,000 - 20,000 psi (1000 - 1400 bar). Pump-mounted.

UNx Spare Parts Packages

Packages include all major fluid end replacement packaged together for easy transport and storage.

20K Pressure Gauge (psi) - Jetstream 20K Port Male Inlet

0 - 35,000 psi scale. 1,000 psi graduations. Working pressure up to 20,000 psi. Jetstream 20K Port Male connection.

4200 UNx Bareshaft Pumps

4200 UNx triplex pumps can handle input power up to 325 hp (242 kW). Output from 63 gpm at 8,000 psi (238 l/min at 550 bar) to 11.9 gpm at 40,000 psi (45 l/min at 2750 bar).