What Is a Fixed Displacement Pump?
A fixed displacement hydraulic pump is ideal when you need a predetermined and constant fluid volume for each pumping cycle. They are referred to as fixed displacement pumps because the volume of fluid pressure for every stroke is fixed. This means that regardless of the load or system demand, the pump delivers a consistent amount of hydraulic fluid during each cycle.
Internal gear and external gear pumps are both examples of fixed displacement pumps as they generate a constant flow rate. These pumps are known for being cost-effective and reliable. Gear pumps are inexpensive, don’t produce much heat, operate at high speeds, generate high flow rates, and are relatively quiet during operation. In addition to gear pumps, vane and piston types can also be designed as fixed displacement models.
Applications communes
Fixed displacement pumps are perfect for machines needing strong fluid pressure. Their tough build lets them work well in hard settings. They can handle many fluid thicknesses. They’re great for factories where dirt and bits are around.
Typical uses include:
Material Handling Systems
Machine Tools
Conveyor Systems
Industrial Manufacturing Equipment
Marine Machinery
Équipement agricole
Systèmes de lubrification
Considerations
When picking a fixed displacement pump, think about your system’s needs. Check your application’s flow rate needs. If your machine needs a steady fluid flow and pressure, a fixed displacement pump is a good fit. Also, if your work needs a constant motor speed without changing pressure or flow often, this pump is simple and reliable.
What Is a Variable Displacement Pump?
A variable displacement hydraulic pump is named variable because you can change the fluid amount per stroke. You can adjust it by hand, with hydraulics, or electronics during use. Unlike fixed pumps, these change their output based on what the system needs.
Because it can tweak its flow for different tasks, the variable displacement pump has a more complex design. This makes it pricier at first and needs more upkeep. But, it saves energy and can run different machines, which balances out the cost.
Variable displacement pumps give better control over the system. They adjust pressure and flow right away. This is super helpful in systems where loads change a lot.
Applications communes
You’ll see variable displacement pumps in heavy machines like cranes, excavators, and backhoes. They’re used where fluid pressure must change for different loads.
Common uses include:
Cranes
Excavators & Backhoes
Industrial Automation Systems
High-Performance CNC Machine Tools
Marine Propulsion Equipment
Mining Machinery
Medical Devices (e.g., surgical tables)
Wind Turbine Actuation Systems
Machines de moulage par injection
Advanced Agricultural Harvesters
Considerations
The big thing to think about with a variable displacement pump is if your task needs real-time changes. If your system needs manual or electronic control of speed or flow, you need a variable pump. Also, if your work involves changing flow based on different machines or loads, this pump is a must.
They cost more upfront and need more care than fixed pumps. But their energy savings can cut long-term costs a lot, especially in systems with changing needs.
Select the Right Hydraulic Pump With Help From POOCCA
Choosing between fixed and variable displacement hydraulic pumps depends on things like cost, steady versus flexible needs, energy saving goals, and system complexity.
POOCCA hydraulique (Shenzhen) Co., Ltd. started in 2006. It has four branches in Hong Kong, Guangdong, Jiangsu, and Zhejiang. We’re a full-service hydraulic company. We focus on research, making, fixing, and selling hydraulic pumps, motors, valves, and parts.
Whether you need sturdy gear pumps like the CBK Series for small systems or advanced options like Rexroth A10VSO Series axial piston variable pumps for hydrostatic transmissions up to 350 bar maximum pressure—POOCCA has a wide range of products for industries like farming, construction, and injection molding systems.
With our well-set-up factory and skilled team, we’re ready to meet the needs of many industries. We offer custom hydraulic solutions for our clients.
Our tech experts can help you check things like needed pressure (up to 420 bar), flow efficiency (often 95% or more), noise levels (key for medical devices), and heat resistance (for metalwork uses).
POOCCA’s big catalog includes fixed options like Parker PGP505 Series Aluminum Gear Pumps, built for tough conditions with pressures up to 300 bar. It also has advanced variable models like Eaton Vickers PVXS Series, made for quick response in hard settings.
FAQ
How do I choose between fixed vs. variable displacement hydraulic pumps?
Think about flow, pressure, and system needs. We’ll help you pick the right product for you.
What is POOCCA’s experience in this field?
POOCCA hydraulic manufacturer began in 1997. It has 26 years in the hydraulic industry.
Do you offer international shipping?
Yes, we have fast international shipping options. Contact our sales team to talk about your needs.
What warranty comes with POOCCA products?
12 months.
Can I request customized solutions?
Yes. We make custom products to fit your unique needs, including special packaging.
Are samples available before purchase?
Yes, we offer product samples and demos to help you choose. Contact our sales team to set it up.
How does POOCCA ensure product quality?
Our products go through strict quality checks and tests. We have a dedicated team to keep standards high.
By leveraging our extensive inventory—spanning over 1600 product categories—and expert support infrastructure across multiple global locations,POOCCA stands ready to help you select the optimal solution among both fixed and variable displacement hydraulic pumps.
