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Spider μProp® - Proportional valves
Low-wear, infinitely adjustable & fast as lightning!

Infinite control

In combination with a flow or pressure sensor and a PID control loop, the Spider μProp can be used to continuously control gases or liquids.

Accuracy & repeatability

Our patented design enables smooth operation and movement of the armature. As a result, our Spider μProp can continuously regulate the flow with very high repetition accuracy over their entire service life.


Each valve is automatically set, calibrated and checked during the production process. This security ensures that our customers trust these valves and that they can also be used in extremely critical applications such as incubators for infants.

System integration

The low energy consumption and the compact design represent a real competitive advantage for portable devices and applications.

Spider μProp® - Proportional Valves


We have brought all our competencies to embed all the key features of our Spider technology in a new proportional valves series: the Spider μProp. Already successful used in Respiratory, Fuel cell systems or in electronic Flow Regulators, the Spider μProp may be controlled using DC current or PWM in open or closed loop control.

Small, accurate, with a very long life time and easy to embed due to its cartridge design, the Spider μProp is used for precision dosing of the flow or pressure of gas and liquids in all kind of critical applications.The Spider μProp provides a fine, smooth and accurate regulation during the whole lifetime of your product!

These valves have a flat armature that moves between the seat and the solenoid. The flat armature is assembled together with a flat spring which presses the integrated sealing element against the valve seat in the de-energized position. Flat armature valves distinguish themselves by frictionless movement and very high life cycles. The Spider μProp are real proportional valves in which the armature stroke and thus the flow rate can be varied by the applied coil current.

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Dimensions VP204-5
Dimensions VP204-57
Dimensions VP204-9
# Model Way function Sealing DN
P min
P max
Kv min
VP 204-502 2-way NC V (FKM) 1,5 0,0 8,0 0,040 2,5 0,023
VP 204-503 2-way NC V (FKM) 1 0,0 10,0 0,020 2,5 0,023
VP 204-505 2-way NC V (FKM) 2,2 0,0 3,0 0,050 2,5 0,023
VP 204-506 2-way NC V (FKM) 0,5 0,0 10,0 0,007 1,5 0,023
VP 204-571 2-way NC V (FKM) 6 0,0 7,0 0,3 3,0 0,025
VP 204-907 2-way NC M (FKM + FFKM) 0,3 0,0 10,0 0,003 1,5 0,005
VP 204-908 2-way NC M (FKM + FFKM) 0,5 0,0 6,0 0,005 1,5 0,005

All specified values are based on our experience. These approximate values are only applicable for guidance.
Product details as well as expressly stipulated performance characteristics/operational purposes shall not relieve the customer of the need to test and validate the product for the intended purpose.

Worth knowing!

What is a proportional valve?

Proportional valves, unlike on/off valves, allow for continuously adjustable valve openings. Proportional valves are used particularly in hydraulics and pneumatics, but also in fields such as medical technology when it comes to controlling variable flow rates or pressures.

Proportional valves come in different configurations. There are directly operated proportional valves as well as pressure-compensated or pilot-operated proportional valves.

Directly operated proportional valves are more commonly used for smaller flow rates. These valves are characterized by very high control dynamics.

Pressure-compensated and pilot-operated proportional valves are typically employed for larger flow rates. Due to pressure compensation or pilot control, these proportional valves have a more compact size and lower electrical power requirements in relation to the larger flow rate demands.

How does a proportional valve work?

Essentially, a proportional valve consists of a valve body with an opening through which the medium flows, an electromagnet, and a movable armature element with an elastometer seal that controls the opening and, consequently, the flow of the proportional valve.

Control Signal

The control of a proportional valve is typically achieved through an electrical signal, often in the form of a variable electric current or voltage. This control signal is generated by external electronics and transmitted to the proportional valve.

Proportional Magnet

The electrical proportional magnet serves as the „engine“ of a proportional valve. The current applied to the proportional magnet determines the strength of the magnetic field and the resulting magnetic force generated by the proportional magnet.

Control Element

The magnetic field of the electrical proportional magnet acts on a movable armature element that regulates the valve opening. This armature element can vary depending on the valve type.

Proportional Control

The strength of the magnetic field controls the position of the control element and, consequently, the opening of the proportional valve. This allows the proportional valve to increase and decrease fluid flow or pressure continuously and proportionally to the input signal.

Advantages of Proportional Valves?

In general, proportional valves offer the following advantages over simple on/off valves:

  • Fluctuating input pressures can be compensated for.
  • Software-based adjustments of flow rates or pressure values are possible after delivery for devices equipped with proportional valves.
  • Silent operation, which is important, for example, in a patient-care environment .

In addition, STAIGER’s proportional valves offer the following benefits:

  • High Repetition Accuracy:
    You can control the desired flow rate with high precision and repeatability, which is crucial in many applications.

  • 100% Calibration:
    STAIGER proportional valves respond quickly to changes in the input signal, enabling rapid flow adjustment.

  • Good responsiveness with high control dynamics:
    STAIGER proportional valves respond very quickly to changes in the input signal, allowing for rapid adjustment of the flow.

  • Low Hysteresis
    STAIGER proportional valves exhibit low hysteresis, meaning there is only minimal deviation between the opening and closing movement of the control element at the same applied current value.

Overall, proportional valves are an excellent choice for precise control of flow rates or pressures in various applications, especially when the above-mentioned advantages are of high importance.


The precise control of the input signal allows for highly accurate flow regulation and proportional adjustment of the flow rate. This functionality makes proportional valves ideal for applications where precise flow control is required, such as in industrial automation, medical technology, hydraulics, pneumatics, and many other fields.

Highlights of the Proportional Valve Spider μProp®

  • Continous Control
    In combination with a flow or pressure sensor and a PID control loop, our Proportional Valve Spider μProp® can achieve continuous control of gasses and liquids.

  • Accuracy and Repeatability
    Similar to our standard Spider valves, our patented design allows for frictionless movement of the plate armature. As a result, our Proportional Valve Speer μProp® can regulate flow continuously with very high repeatability throughout its entire lifespan.

  • System Integration
    Low energy consumption and a compact design provide a genuine competitive advantage for portable devices and applications.

  • Safety
    Each valve is automatically set, calibrated, and inspected during the production process. This ensures that every valve leaving our factory meets the specifications. This level of safety instills trust in our customers, particularly in our Proportional Valves, allowing them to be used in highly critical applications such as infant incubators.

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