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MJM Series

Self-Priming Jet Pump with Built-In Ejector

The MJM series self-priming jet pump with built-in ejector is a kind of household self-priming pump, and it mainly consists of pump, ejector (nozzle and Venturi pair), guide vane and impeller. This single-phase jet pump makes use of rotor (with stainless steel shaft) and high-power motor to ensure enough power output and low temperature rise, while the motor adopts thermal protection. Moreover, it realizes large flow rate and long service life, while the working voltage range is pretty wide, from 170V to 250V.

Working Principle
During working, the impeller rotates to drive the water flow through the guide vane, so water is pressurized and moves into the pump chamber. Some of the pressurized water flows into the nozzle and then passes through the Venturi tube at a high speed, thus creating a negative pressure at the back end of nozzle. This negative pressure is used to draw liquids into the ejector, and then these liquids are transported into impeller through the ejector. On the other hand, the rest of pressurized water is discharged from the outlet of this self-priming jet pump.

Operating Condition
1. Ambient temperature: Up to +40℃
2. Liquid temperature: Up to +40℃

Exploded View Drawing
Technical Data of MJM Series Self-Priming Jet Pump
Model Power Q m3/h 0 0.6 0.9 1.2 1.5 1.8 2.1 2.4 2.7 3.0 3.6 4.2 4.8 5.4 6.0
1-phase kW HP L/min 0 10 15 20 25 30 35 40 45 50 60 70 80 90 100
MJm25(X) 0.37 0.50 H (m) 27 21 18 15 13 10 7 4 - - - - - - -
MJm75(X) 0.55 0.75 32 26 23 20 17 15 13 10 8 5 4 - - - -
MJm100(X) 0.55 0.75 33 27 25 22 19 17 14 12 10 8 - - - - -
MJm101(X) 0.75 1 38 31 28 25 22 20 17 15 12 10 - - - - -
MJm102(X) 0.75 1 40 33 30 27 25 22 19 17 15 12 9 6 - - -
MJm103(X) 0.75 1 43 37 34 31 28 25 23 20 17 15 12 8 - - -
MJm155(X) 1.1 1.5 45 40 37 34 31 29 27 24 22 20 16 13 10 8 6
MJm156(X) 1.1 1.5 47 42 39 37 34 32 29 27 25 23 19 17 12 - -
MJm157(X) 1.1 1.5 53 48 45 42 39 37 35 32 30 28 23 20 16 - -
MJm200(X) 1.5 2 55 50 47 45 43 40 37 35 33 30 26 23 19 16 -
MJm201(X) 1.5 2 58 53 51 48 45 43 41 38 36 34 29 25 22 - -
MJm202(X) 1.5 2 65 58 55 52 49 46 44 41 39 36 32 28 24 - -
Dimension of MJM Series Self-Priming Jet Pump
Model Pipe diameter (inch) Installation size (mm)
1-phase DN1 DN2 a f h h1 l n n1 w s
MJm25(X) 1 1 96.5 353.5 180 135 170 170 132 23 10
MJm75(X) 1 1 126 405.5 200 147 182 180 140 25 10
MJm100(X) 1 1 126 405.5 200 147 182 180 140 25 10
MJm101(X) 1 1 126 405.5 200 147 182 180 140 25 10
MJm102(X) 1 1 126 405.5 200 147 182 180 140 25 10
MJm103(X) 1 1 126 405.5 200 147 182 180 140 25 10
MJm155(X) 1 1/4 1 137 473 235.5 165 213 206 160 30 10
MJm156(X) 1 1/4 1 137 473 235.5 165 213 206 160 30 10
MJm157(X) 1 1/4 1 137 473 235.5 165 213 206 160 30 10
MJm200(X) 1 1/4 1 137 473 235.5 165 213 206 160 30 10
MJm201(X) 1 1/4 1 137 473 235.5 165 213 206 160 30 10
MJm202(X) 1 1/4 1 137 473 236 165 213 206 160 30 10
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