Suction filters for hydraulics Efficient pump protection and maximum service life
Reliably protect your hydraulic pump against particles and cavitation. Our suction filters for tank installation feature an integrated foot valve, enabling horizontal installation and hassle-free maintenance below the oil level – without the need to drain the oil. For maximum uptime that meets the highest ISO standards.
Why a suction filter ensures the service life of your hydraulic pump
In heavy industry and mobile hydraulics, components are constantly subjected to extreme stress. When a hydraulic pump needs to be protected against coarse contamination, a standard screen often isn’t enough. Particles that enter the tank during operation or through the ventilation system will immediately cause wear to gears, pistons, and housing walls if filtration is not in place.
A professional suction filter captures these contaminants before they reach the pump. By using structures optimised for flow in a targeted manner, we can also ensure that mechanical flow resistance remains minimal. This is crucial to reliably prevent the dangerous effects of cavitation, a phenomenon where gas bubbles form due to low pressure, which can otherwise cause irreparable damage to pump components in a very short time.
Innovative design: hydraulic tank filters for installation in a tank
Modern plant layouts require maximum flexibility with minimal space requirements. Our systems are perfectly designed and mechanically optimised for use in suction filter tank installations. This direct installation in the tank wall or tank flange saves valuable installation space and reduces external piping connections, which lowers the risk of leaks to almost zero.
Flexibility in the layout: Installing a hydraulic suction filter horizontally
A common issue in tight spaces above the reservoir is the lack of vertical installation space. The mechanical design of our filter series provides a sustainable solution to this challenge: the integrated flow design and housing stability enable engineers to install the suction filter horizontally. Even when installed horizontally below the oil level, the filter's full performance and flow dynamics remain uncompromised. The flexible design of the suction filter tank installation makes it an ideal solution for compact hydraulic power units.
Maintenance without downtimes: replace hydraulic filters without draining oil
For maintenance managers, the ease of maintaining a component is a critical factor in determining overall operating costs (TCO). A classic filter change in systems below the fluid level has traditionally meant stopping the system, draining hundreds of litres of hydraulic oil, replacing the filter, and pumping the oil back in. This takes time, leads to delays, and carries the risk of environmental pollution.
The self-closing inlet valve (foot valve)
This is where our technical innovation comes in: the mechanical inlet valve integrated into the suction filter closes automatically when the housing cover is removed.
- The advantage: You can replace the hydraulic filter without draining the oil from the tank – even when it’s installed horizontally far below the oil level.
- Safe protection: Since the inlet valve immediately blocks backflow, the system oil remains in the tank, and the oil in the filter housing can be safely drained through the drain screw during element replacement. The reliable inlet valve ensures that element replacement can be carried out in a completely clean, fast, and contamination-free manner, without affecting the surrounding environment. This type of inlet valve drastically reduces maintenance time.
Technical specifications and the highest validation standards
For a precise design in mechanical engineering and system integration, performance values must be able to be reproduced exactly. Our filter elements are rigorously validated in accordance with international ISO standards and are continuously subjected to stringent quality control measures.
Design features of the SPA series:
- In-to-out flow direction: this specific flow design ensures that the separated contamination particles remain fully in the filter basket during element replacement and do not return to the tank.
- Magnetic pre-filtration: the magnetic core integrated into the cover efficiently captures ferrite particles before the fluid even reaches the actual filter fleece. This reduces the medium's contamination load and significantly extends the element's service life.
- Clogging indicators: the filter head’s universal connection options allow for the flexible integration of visual or electrical vacuum indicators, enabling precise maintenance planning.
- Verified quality: Validation is conducted in accordance with several standards, including ISO 2941 (collapse and burst pressure), ISO 2942 (proof of satisfactory manufacturing), ISO 3968 (flow characteristics), and ISO 16889 (multipass test).
Technical specifications and product variants at a glance
Depending on the required flow rate and system size, you can choose from precisely tailored series to ensure optimal installation of the suction filter in the tank.
| Type/ Series | Max. flow rate | Key features and installation |
|---|---|---|
| SPA 100 | Up to 100 l/min | A compact housing designed for suction filter tank installation, featuring an upward-removable element, making it ideal for tight spaces. |
| SPA 150 | Up to 150 l/min | Optimised flow in a compact nominal size for medium-sized mobile hydraulics systems. |
| SPA 180 | Up to 180 l/min | Increased contamination retention capacity for harsh industrial environments. |
| SPA 200 | Up to 200 l/min | Robust construction ensures increased flow rates and extended intervals between maintenance. |
| SPA 250 | Up to 250 l/min | High-performance variant designed for large-scale systems and heavy-duty industrial hydraulics. |
The exact design of a suction filter depends on many variables, such as viscosity, minimum suction pressure, and the required filtration rating. Rely on tried-and-tested expertise to protect your pumps.
