Cementing Units | Duplex Pumps With Pistons

Duplex Pumps With Pistons
Destination

The duplex pumps are double-acting pumps with "V" toothed cylindrical gear, built especially for operating conditions of cementing units.
The pumps are designed to run on reduced revolutions (17-110 double stroke/min) providing proper filling of pump cylinders and more than 0,9 volumetric efficiency on natural suction without supercharging.

Contents
Fluid end Power end Lubrication Frame Pistons


Constructive characteristics:

The hydraulic part of pump may be equipped, as desired, with the following range of pistons: Ø100 mm, Ø115 mm and Ø127 mm.
In hydraulic part of pump mechanical energy is converted to hydraulic energy at the required operating pressure.
The hydraulic body is independent for each cylinder and is fixed to the pump frame. The discharge chambers at the two hydraulic bodies are united by discharge collector. The suction chambers of the hydraulic bodies are united by a common collector, sealed against each chamber.
The power end converts the ratating movement from the transmission into translation movement required by the pistons.

The power end is equipped with a "V" gear with a gear ratio of 4,058.
The crankshaft is supported on two self-aligning radial bearings and is provided internally with holes for crankpin lubrication.
The "V" toothed gear has the crowns fixed on crankshaft. Axial force developed in each crown pushes the crown towards the crankshaft shoulder and does not create additional stresses on the fixing screws.

The Connecting rods have both ends on bearings, and bushing from cast bronze for crosshead bolt.
The Transmission Mechanism lubricating system provides lubrication under pressure of the connecting rod bearings, crankshaft bearings and crosshead casings.
Oil under pressure is supplied by a gear pump which is flanged on the piston pump frame and is driven by its transmission shaft.
The other moving parts of the transmission mechanism such as gears, transmission shaft bearings are splash lubricated.

The duplex pistons pumps are driven by chassis truck engine, by mechanical transmission. This transmission is provided with a CV 5-200 gearbox, two cardan shafts united by an intermediate reducer and a toothed clutch.

See the folowing table for technical performances which can be obtained with these pumps :

CV 5-200
Speed
Drive motor, r.p.m. Pump, double stroke/min Max. working pressure, bar Theoretical output, l/min
Plunger diameter, mm Plunger diameter, mm
100 115 127 100 115 127
I 1200 17,1 350 260 200 120 182 202
1400 19,9 147 189 236
1600 22,6 159 216 267
1800 25,7 181 244 306
2000 28,5 211 171 337
2200 31,3 221 297 370
II 1200 32,5 180 140 110 226 305 380
1400 37,4 264 356 459
1600 42,8 302 406 507
1800 48,1 339 459 570
2000 53,5 377 509 634
2200 58,8 414 559 696
III 1200 58 100 75 60 409 552 685
1400 67,6 476 645 801
1600 77,3 544 735 915
1800 87 623 827 1030
2000 96,6 681 920 1149
2200 106,5 750 1000 1260
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