Hilin Technology Releases SCPV Servo Proportional Valve, Defining a New Standard in Precision Fluid Control
In August 2026, Chengdu Hilin Technology Co., Ltd. officially announced the launch of its brand-new precision fluid control product—the SCPV Servo Proportional Valve. As the industry’s first electronically controlled proportional needle valve featuring a closed-loop servo control system combining a stepper motor with FOC (Field-Oriented Control) vector drive technology, the SCPV offers micron-level regulation precision, power-off memory function, and an integrated drive-control design. It provides a new technological option for the precision flow control field and is widely applicable in analytical instruments, environmental monitoring, research equipment, and industrial automation.
Simplicity in Design, Exquisite in Craftsmanship
The SCPV pursues ultimate simplicity and ease of use in product design, eliminating the need for users to purchase additional controllers or drivers. The product highly integrates the servo driver, motion controller, and proportional valve body into a single unit. Users only need to connect a 24V DC power supply and use a 0–5V voltage signal or a 4–20mA current signal to directly achieve precise control of the proportional valve opening. The signal corresponds one-to-one with the valve position, ensuring intuitive operation and rapid deployment.
In terms of control performance, the SCPV achieves a nearly linear relationship between input signal and actual flow rate, thanks to its excellent linearity and extremely low hysteresis—delivering industry-leading flow control linearity. With outstanding linearity and repeat accuracy, the product demonstrates good stability during operation. Users do not need to write complex algorithms or repeatedly tune PID parameters to address common automatic control issues such as oscillation or overshoot, effectively reducing system integration complexity and commissioning costs.
Daring to Break New Ground
To address the long-standing industry pain point of zero-reset positioning in electronically controlled proportional valves, the Hailin Technology R&D team has achieved a breakthrough solution through independent technological innovation. Traditional stepper motor proportional valves use open-loop control, where the valve spool position information is lost after power-off. Each time the system is powered back on, a zero-reset operation must be performed, significantly impacting production and commissioning efficiency in scenarios involving frequent start-stop cycles or unexpected power outages.
Hailin Technology has independently developed a dual-track position and coordinate algorithm, integrated with the latest multi-turn absolute encoder technology, to achieve zero-reset multi-turn absolute position control. The valve spool position is known in real time and traceable with accuracy. After power-off, the current position is automatically memorized, and upon power restoration, the valve resumes its pre-power-off state without any zero-reset operation. This innovation greatly simplifies user workflows, overcomes a technical bottleneck that has plagued the industry for decades, and represents a significant advancement in precision proportional control.
High Precision, High Performance – Comprehensive Leading Technical Specifications
The SCPV employs a closed-loop feedback system consisting of a servo motor and a high-precision position sensor, delivering triple high-precision servo control over position, speed, and force for valve spool opening and closing. The regulation precision reaches the micron level, free from interference from load and friction, and the reliability is comprehensively superior to traditional open-loop proportional valves.
Key Parameters
| Parameter | SCPV4060 |
|---|---|
| Maximum Flow Rate | 150 L/min (@5Bar) / 50 L/min (@1Bar) |
| Control Resolution | 1‰ F.S |
| Repeat Accuracy | <1‰ F.S |
| Hysteresis | <1% F.S |
| Linearity | <4% F.S |
| Full-Stroke Adjustment Time | <0.6s |
| Maximum Working Pressure | 0.5 MPa |
| Supply Voltage | 24–48V DC |
| Cycle Life | 1 million cycles |
The product effectively addresses the temperature drift issues commonly found in electromagnetic proportional valves. The servo system only operates when the valve is in motion; it generates minimal heat when holding a position, so operating conditions are not affected by coil heating or temperature drift. This makes it suitable for long-term continuous adjustment requirements. Additionally, the product is compatible with both gas and liquid media, and offers multiple seal material options including FKM, EPDM, and FFKM to accommodate the chemical compatibility requirements of different media.
Flexible Control, Seamless Integration into Existing Systems
The SCPV supports three control methods: 4–20mA current control, 0–5V voltage control, and Modbus RS485 bus control. It can flexibly interface with various PLCs, industrial computers, and instrumentation systems, and supports multi-device RS485 bus networking. The product features built-in position detection output and dual-color (red/green) status indicators to provide real-time operating status feedback and timely warnings in abnormal situations.
The accompanying graphical PC software further lowers the barrier to use, allowing engineers and technicians to perform opening settings, position readback, and parameter adjustments without writing code, effectively shortening equipment commissioning and deployment cycles.
Typical Applications
- Precision gas and liquid flow control. For high-precision proportional regulation in analytical instruments and environmental monitoring equipment, the product leverages its high linearity to achieve stable open-loop proportional regulation. For applications requiring even higher precision, it can be paired with pressure or flow sensors to form a closed-loop control system.
- Laboratory fluid control. Suitable for applications such as microfluidic pressure precision control and research test benches. The PC software enables efficient and convenient experimental setup and commissioning.
- Upgrade and replacement solution. For users of stepper motor open-loop proportional valves from brands such as Burkert, Clippard, Enfield, and Golu, the SCPV effectively resolves issues like position loss, insufficient precision, and inconvenient zero-reset procedures, delivering a direct upgrade with stronger performance and better cost-effectiveness. In applications where electromagnetic proportional valves fail to meet precision requirements due to temperature drift and hysteresis, the SCPV likewise provides a higher-performance solution.
High Cost-Effectiveness – A New Choice for Domestic Replacement
While delivering performance comparable to imported products, the SCPV maintains a highly competitive pricing strategy. The product is priced at approximately one-third of similar imported products and less than half the price of comparable domestic products. The price already includes the drive section, so users do not need to purchase a separate motor driver, resulting in significant total cost-of-ownership advantages.
Flexible Customization, Configured on Demand
The SCPV supports various connector types including push-in, push-to-connect, and female threads, and offers multiple seal material choices including FKM, EPDM, and FFKM. For larger or smaller flow rate requirements, customization can be flexibly achieved by adjusting the valve spool size and stroke to meet the differentiated needs of various application scenarios.
