Bosch Rexroth | PVV21-1X068-027RA15DDMB
PVV21-1X/068-027RA15DDMB
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The PVV21-1X/068-027RA15DDMB pump belongs to the PV Fixed Displacement Pumps series produced by Bosch Rexroth. It is configured as a double unit for hydraulic automation where constant flow is needed on two circuits driven by a single shaft. The flange side moves 67.5 cm³ for every revolution while the cover side moves 27.4 cm³ per revolution, so different flow rates can be assigned to separate machine functions. Continuous working pressure is 175 bar on the flange section and 210 bar on the cover section, giving each outlet its own operating limit. Clockwise rotation matches common electric motor arrangements, simplifying drive coupling. A minimum operating speed of 600 rpm maintains lubrication at low flow, and the maximum speed of 1800 rpm at 1 bar inlet prevents cavitation while still supporting rapid cycle duties.
Hydraulic fluid must keep a viscosity of at least 13 mm²/s to preserve bearing film and volumetric efficiency. Service temperature can drop to −10 °C at startup and may rise to 70 °C during sustained operation, allowing use in a broad range of plant environments. The pressure outlet on the flange housing is positioned at the top (0 degrees) so trapped air can escape through the delivery line. Connection sizes are standardized: the cover pressure port is SAE 3/4 inch, the flange pressure port is SAE 1 inch, and the shared suction inlet is SAE 2 1/2 inch to keep inlet velocity low. NBR seals contain the fluid and tolerate the specified temperature span, limiting leakage throughout the pump’s service life.
Technical Specifications
Continuous Pressure (cover Side)
210 bar
Continuous Pressure (flange Side)
175 bar
Displacement (cover Side)
27.4 cm3/rev
Displacement (flange Side)
67.5 cm3/rev
Fluid Viscosity Min
13 mm2/s
Max Fluid Temperature
+70 C
Max Speed (pvv At 1 Bar)
1800 min-1
Min Fluid Temperature
-10 C
Min Speed
600 min-1
Pressure Port Position (flange)
Top (0 deg)
Pressure Port Size (cover)
SAE 3/4 in
Pressure Port Size (flange)
SAE 1 in
Rotation
Clockwise
Seals
NBR
Suction Port Size
SAE 2 1/2 in
1620 Old Apex Road
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