Observation on the Trend of the Solenoid Valve Industry: Three Major Directions: Low Power Consumption, Intelligentization, and Corrosion Resistance

Solenoid valves are the "switching muscles" of automated fluid control, widely used in large quantities. However, the focus of industry competition is shifting: low power consumption addresses "where does the electricity come from", intelligence addresses "state visibility", and corrosion resistance addresses "living longer". This article breaks down three major directions according to "driving force → technical route → selection impact".
Key points of this article (30-second quick overview)
Low power consumption: With three approaches including dual-coil, buck-and-hold, and permanent magnet self-holding, the "holding" power consumption can be reduced by an order of magnitude or even to zero - a ticket to battery-powered scenarios.
Intelligentization: position feedback, current diagnosis, IO-Link/bus valve terminal, predictive maintenance, solenoid valve transforming from a "dumb actuator" to an "information node".
Corrosion resistance: The valve body material is upgraded in a step-by-step manner (brass → 316L → PVDF → special alloy) + plating and coating + sealing components, with customized material combinations according to the medium.
For procurement: shift from "comparing unit prices" to "calculating total lifecycle costs", and incorporate power consumption metrics and data interfaces into procurement specifications.
For manufacturing enterprises, rapid prototyping, material database, and electronic software capabilities are the competitive thresholds for the next stage.
I. Background: Where do the three major directions come from? Expansion of application scenarios: smart water meters, agricultural irrigation, portable healthcare, AGV, etc. The influx of battery-powered and mobile scenarios makes the "continuous power consumption" of traditional coils a significant drawback; Industrial Internet sinking: factories not only require "valve actuation", but also "state awareness and fault predictability"; Expansion of medium boundaries: water treatment dosing, chemical industry, semiconductor specialty gases, marine outdoor applications, and other harsh media and environments impose higher requirements on lifespan.
Figure 1 (see HTML version): Schematic diagram of three major trends - low power consumption (battery + pulse), intelligence (valve + network node), and corrosion resistance (shield + material gradient).
II. Trend 1: Low Power Consumption - "Maintaining" Without Consuming Power Pain Point: Conventional solenoid valves require continuous excitation to maintain their valve position, and the coil typically consumes power of about 1~20W (depending on type and caliber). In battery-powered scenarios, this poses a problem of "where does the electricity come from".
Technical Roadmap
Principle
Maintain power consumption
Characteristics and precautions
Conventional single coil
Continuous excitation maintenance
About 1~20W (depending on the model)
The simplest structure and lowest cost
dual coil
After the starting coil is activated, switch to a low-power holding coil
Reduced to a fraction of the usual
Small changes, low cost, and need for switching control
Voltage reduction and maintenance
After being activated, the voltage is maintained at 50~70%
Reduce to 1/3~1/2 of the usual level
Requires driver circuit support
Permanent magnet self-maintenance (bistable state)
Permanent magnet maintains valve position, and electrical pulse switches it
Maintain zero power consumption during the standby phase
The most thorough power saving; remain in place when powered off, safety logic needs to be reassessed
Selection impact: Battery life is estimated based on "number of operations × power consumption per operation". Self-maintaining solutions often extend battery life by an order of magnitude; however, bistable valves remain in their original position after power loss (memory function), and the design assumption of "power loss = safe state" needs to be reevaluated.
III. Trend 2: Intelligentization - From Actuators to Information Nodes Pain Points: Valves are key nodes in gas/liquid circuits, but they have long been "dumb devices" - only when they break down do we know, and maintenance relies on regular replacement.
Evolution of four-level capabilities:
Visible: Integrated valve position feedback and cylinder positioning detection, with real-time status upload; Diagnosable: Monitoring coil current curve and temperature - stagnation, seal deterioration, and coil aging all have characteristics in the current waveform; Connectable: IO-Link valve terminal and bus valve terminal (PROFINET, EtherCAT, Modbus, etc.), replacing dozens of wires with one bus, supporting remote parameterization and bit-by-bit diagnosis; Predictable: Action count statistics + life model, upgrading "regular replacement" to predictive maintenance of "replacement based on status".
Selection impact: The integration of valve terminals significantly reduces wiring and commissioning costs; intelligent valves have a higher unit price, but they are often cost-effective compared to downtime losses. Two additional lines are being added to the procurement specification: power consumption indicators and data interface protocols.
IV. Trend 3: Corrosion Resistance - Triple Upgrade of Materials, Coatings, and Seals Facing Dual Challenges: Corrosion from Media (Acids, Alkalis, Salts, Solvents) + Corrosion from Environment (Salt Spray, Humidity, Outdoor Conditions).
Upgrade route:
Valve body material progression: Brass (general water and gas) → 304 → 316L (chloride ions, seawater) → Engineering plastics PVC/CPVC/PP/PVDF (acids and alkalis) → Hastelloy, titanium (severe corrosion and harsh conditions); Surface treatment: Chemical nickel plating, Teflon coating, Dacromet, etc.; Seal progression: NBR (oil resistant) → EPDM (acid and alkali water vapor resistant) → FKM fluororubber (resistant to most chemicals and higher temperatures) → PTFE/PFA (nearly fully compatible, slightly weaker elasticity); Structural isolation: Diaphragm structure keeps the electromagnet and the medium "out of sight".
Selection impact: Corrosion resistance is not about "the more expensive, the better". Instead, it involves combining materials based on the medium, concentration, and temperature, and verifying through immersion testing for critical operating conditions. Experience shows that even if the valve body is correctly selected, failure can still occur if the seal is incorrect - the seal is the weakest link in the chain of corrosion resistance.
V. Quick Overview of Three Major Trends
Driving force
Representative technology
Impact on model selection and procurement
low power consumption
Battery-powered, IoT terminal
Dual coil, step-down hold, permanent magnet self-hold
Estimate battery life based on the number of actions; redefine the power-off safe state
Intelligent
Industrial Internet, predictive maintenance
Position feedback, IO-Link/bus valve terminal, current diagnosis
Valve terminal integration reduces wiring; data interface is written into procurement specifications
Corrosion-resistant
Severe media and outdoor environment
316L/plastic valve body, plating and coating, fluororubber seal
Customize material combinations according to the medium; confirm seals separately
VI. Implications for Downstream Users and Manufacturing Enterprises For equipment manufacturers and end users: Expand the selection criteria from "diameter, pressure, voltage" to "power consumption, data, material"; compare solutions based on total lifecycle costs (procurement price + energy consumption + downtime + maintenance); specify the upper limit of power consumption, communication protocol, and medium composition in the procurement specifications.
For manufacturing enterprises: The requirements for the general capability of "being able to do everything" in the three major directions have decreased, while the demands for the "three core skills" have increased - rapid prototyping and customization response, material and medium compatibility database, and electronic and software capabilities. Whoever can first turn these into standard practices will take the lead in the next stage.