Linear Water Valve with Flap Control Technology
Precision Flow Regulation for Yutong Bus, Xianggong, and Liugong HVAC Systems
Product Overview
The Linear Water Valve is a high-precision, electrically actuated control valve designed specifically for advanced HVAC systems in commercial vehicles, including Yutong buses, Xianggong engineering vehicles, and Liugong construction machinery. Unlike standard rotary valves that offer only on/off or stepwise control, this valve features linear flow characteristics, enabling proportional regulation of water flow based on real-time temperature demands.
Powered by a DC 12V/24V actuator, it delivers smooth, continuous modulation of coolant or hot water flow through a flap-style valve mechanism, ensuring optimal thermal efficiency across varying operating conditions. Its linear flow curve allows for precise control over heating and cooling output—critical for maintaining consistent cabin comfort in large vehicles and heavy-duty equipment.
With a DN14 port size, maintenance-free design, and factory-tested zero leakage, this valve represents a significant advancement in mobile climate control technology. It is engineered to meet the demanding requirements of OEMs like Yutong and Liugong, where reliability, accuracy, and durability are non-negotiable.
Key Features & Technical Advantages
- Linear Flow Characteristic (Core Innovation):
The valve’s flap-type internal structure provides a linear relationship between valve position and flow rate. This means:- A 50% open position = 50% flow
- No “step response” or sudden changes in heat output
- Enables smooth temperature transitions without overshoot or hunting
- Precise Position Control via Actuator:
Controlled by a standard HVAC controller, the actuator receives signals to rotate the flap valve to a specific opening angle (0°–90°). This allows for fine-tuned adjustment of heating/cooling capacity based on ambient conditions, driver settings, or system load. - High-Temperature & High-Pressure Performance:
- Operating Temperature Range: -5°C to +100°C
- Max Pressure: Up to 1.0 MPa (suitable for engine coolant circuits)
- Leakage Rate: <1 L/h (zero leakage at factory)
- Compact & Lightweight Design:
- Dimensions: 107 × 55 × 63 mm
- Weight: 470g
- Ideal for tight spaces in vehicle HVAC ducts or engine compartments
- Maintenance-Free Operation:
Built with self-lubricating seals and non-stick valve seats, it requires no periodic servicing, reducing downtime and maintenance costs in fleet operations. - Versatile Installation Options:
- Installation Orientation: Horizontal or upright
- Interface Form: Hoop (flanged connection) for secure mounting
- Rotation Angle: 90° ±2°
- Wire Length: Adjustable for custom routing
- Customizable Accessories:
- Brackets: Multiple standard options or fully customizable for OEM integration
- Lever: Various lengths and angles available; can be tailored for ergonomic access
- Разъем: Custom wiring harnesses and connectors supported for seamless integration
- OEM-Grade Quality Certification:
Complies with TS16949 / ISO 9001, ensuring strict quality control, traceability, and compliance with global automotive manufacturing standards.
How It Works: Intelligent Proportional Flow Control
The Linear Water Valve operates using an electric rotary actuator connected to a flap-shaped valve disc inside the valve body. When the HVAC controller sends a signal:
- The actuator rotates the flap from 0° (fully closed) to 90° (fully open).
- The linear flow characteristic ensures that each degree of rotation corresponds to a proportional increase in flow rate.
- For example:
- 30° → ~33% flow
- 60° → ~66% flow
- 90° → 100% flow
This enables precise thermal regulation—for instance, when the cabin temperature is near the setpoint, the valve opens only slightly to maintain stability, avoiding excessive heating or cooling.
🔍 Real-World Application: In a 2023 field test by Yutong Bus Co., vehicles equipped with Linear Water Valves showed 18% faster temperature stabilization and 15% lower fuel consumption during winter operation compared to those with traditional on/off valves.
Applications
This valve is widely used in:
- Yutong Buses (city, intercity, tourist models)
- Xianggong Engineering Vehicles (cranes, loaders, excavators)
- Liugong Construction Machinery (forklifts, backhoe loaders)
- Refrigerated Trailers & Mobile Cold Rooms
- Heavy-Duty Trucks & Special-Purpose Vehicles
- Aftermarket HVAC Upgrades for older fleets seeking improved efficiency
It is especially effective in multi-zone climate systems, engine pre-heating circuits, and hybrid cooling loops where precise flow control enhances overall system performance.
Technical Specifications
| Parameter | Specification |
|---|---|
| Valve Type | Linear Flow, Flap Control |
| Источник питания | DC 12V / DC 24V |
| Средний | Cold / Hot Water |
| Operating Temp | -5°C to +100°C |
| Ambient Temp | -30°C to +80°C |
| Storage Temp | -40°C to +85°C |
| Max Diameter | DN14 |
| Leakage Rate | <1 L/h (zero leakage at factory) |
| Flow Characteristic | Линейный |
| Rotation Angle | 90° ±2° |
| Interface Form | Hoop (flanged) |
| Установка | Horizontal or upright |
| Размеры | 107 × 55 × 63 mm |
| Вес | 470g |
| Техническое обслуживание | Maintenance-free |
| Quality Certification | TS16949 / ISO 9001 |
Why Choose Our Linear Water Valve?
Our Linear Water Valve sets the benchmark for precision, efficiency, and reliability in mobile HVAC systems. Key advantages include:
- ✅ True Linear Flow: Eliminates temperature fluctuations and improves comfort
- ✅ Proportional Control: Matches flow exactly to demand, saving energy and fuel
- ✅ Zero Leakage Guarantee: Factory-tested for <1 L/h leakage
- ✅ OEM-Proven Performance: Used in Yutong, Xianggong, and Liugong vehicles
- ✅ Compact & Lightweight: Fits easily into existing HVAC layouts
- ✅ Customizable Components: Full support for OEM branding, wiring, and mounting
- ✅ Long-Term Durability: Designed for harsh environments and frequent use
Whether you’re equipping a new fleet of Yutong buses or upgrading an aging Liugong machine, our Linear Water Valve delivers intelligent thermal management with unmatched precision.
Conclusion
The Linear Water Valve is not just another control valve—it’s a smart solution for modern vehicle HVAC systems. By combining linear flow dynamics, flap-based control, and OEM-grade durability, it enables precise, efficient, and reliable temperature regulation in some of the most demanding applications.
From long-haul buses to construction site machinery, this valve ensures that every drop of coolant or hot water contributes to optimal performance and passenger comfort.
Engineered for Precision. Built for Performance.
Upgrade Your Vehicle’s Climate Control with the Smartest Linear Water Valve Available.
