Vickers Hydraulic Pump Double Blade Pump 3520V 3525V
This is a classic and widely used Vickers double bladed pump. Its naming convention is quite 'old-fashioned', but the information is clear. It should be noted that Vickers is currently under the Eaton Group and is part of Eaton's hydraulic business.
Model Decomposition and Meaning
The number "3520V" can be broken down into two parts, representing its core features:
35 "and" 20 ": These two numbers represent the geometric displacement per revolution (in cubic inches per revolution, in ³/rev) of the front and rear pumps in the twin pump.
Front pump (usually near the shaft extension end) displacement: 3.5 in ³/rev
Rear pump displacement: 2.0 in ³/rev
Therefore, this is a dual blade pump with unequal displacement. Total displacement=front pump+rear pump=5.5 in ³/rev.
V ": This is a key suffix representing" variable "or more specifically" with pressure compensator ". This means that this pump is equipped with a pressure compensator flow control device.
Working principle: When the system pressure reaches the preset compensator set pressure, the compensator will act to reduce the eccentricity of the pump stator, thereby causing the output flow rate of the pump to sharply decrease (usually to a small flow rate that is only enough to maintain leakage and compensator control), in order to maintain the set pressure. At this time, the pump is in high-pressure standby mode, with extremely low power consumption and small oil temperature rise.
Function: To achieve energy saving, reduce heat generation, and play a role in safe overflow of the system (the compensator set pressure is usually used as the maximum safe pressure of the system).
Main features and advantages
Dual structure: Two independent pump cores are integrated into one pump casing, which can drive two independent circuits in a hydraulic system or provide merging for the same circuit. The 3520V unequal displacement design is very flexible, for example:
The large pump (3.5 in ³) is used for active operation (such as cylinder lifting), while the small pump (2.0 in ³) is used for pilot control or auxiliary action.
Combining high and low pressure to achieve two-stage flow output.
Pressure compensation variable function (V): This is its core value. In systems that require pressure maintenance or intermittent operation (such as clamping and locking conditions), energy-saving and heat reduction effects are significant. Compensator pressure is usually adjustable.
High performance design: Vickers vane pumps are renowned for their low noise, long lifespan, and excellent self-priming ability. Its balanced blade design reduces bearing load and allows for higher working pressure (compared to early blade pumps).
Wide application foundation: After long-term market validation, spare parts and maintenance resources are relatively easy to obtain.
Typical Applications
Due to its dual connection and variable characteristics, 3520V is very suitable for medium and high pressure hydraulic systems that require multi-stage flow and energy-saving pressure maintenance:
Plastic injection molding machine (injection/holding stage)
Machine tool (clamping circuit)
Press/hydraulic press
deck machinery
Pilot control system for construction machinery
Clamping and positioning devices in various industrial production lines.
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