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This is a 3-way/2-way solenoid proportional modulating valve with DN20 (3/4″) threaded connection and a Kvs value of 5.0 m³/h. It operates on 24V AC/DC power supply, with selectable control signals: 0-10V / 2-10V / 4-20mA. It features a positioning time of less than 2 seconds, a resolution of 1:1000 and an IP54 protection rating. It is designed for mixing and straight flow control of cold and hot water in closed HVAC systems.
- Model Code Explanation
| Code Segment | Description |
| MXG | Product series code: MX stands for solenoid actuator; G stands for external thread connection, suitable for cold and hot water systems |
| 461 | Model type code: ACVATIX™ series solenoid control valve, PN16 pressure rating |
| 0.2 | Nominal diameter DN: 20mm (3/4 inch) |
| -5 | Kvs flow coefficient: 5.0 m³/h (flow rate of cold water at 1 bar pressure differential) |
| (Suffix P) | Optional version: For media containing mineral oil (SAE05…SAE50) |
| (Suffix U) | Optional version: Equipped with NPT thread fitting set |
- Main Technical Specifications
| Category | Specifications | Remarks |
| Basic Parameters | ||
| Valve Type | Switchable 3-way mixing valve / 2-way straight valve | Not applicable for diverting service |
| Connection Type | External thread G1¼B (ISO 228-1) | DN20 corresponds to 3/4 inch |
| Nominal Pressure | PN16 (1.6MPa) | Max. working pressure: 1000kPa |
| Flow Coefficient | Kvs=5.0 m³/h, Cv=5.9 | Cold water at 5-30℃, 1 bar pressure differential |
| Actuator Parameters | ||
| Power Supply | AC/DC 24V ±20% (SELV/PELV) | Frequency: 45-65Hz |
| Control Signal | DC 0/2-10V or DC 4-20mA (DIP switch selectable) | Input impedance: ≥100kΩ (voltage signal), 100Ω (current signal) |
| Position Feedback | DC 0-10V (Load resistance >500Ω) | Non-wear inductive measurement |
| Positioning Time | < 2 seconds | Fast response |
| Stroke Resolution | 0.736111111 | High regulating accuracy |
| Protection Class | IP54 | Dustproof and splash-proof |
| Valve Body Parameters | ||
| Valve Body Material | Cast iron EN-GJL-250 (GG25) | Plug: CrNi steel; Seat: Brass |
| Seal Material | EPDM (Standard) / FPM (Type P) | For different media |
| Medium Temperature | 1-130℃ | For cold and hot water systems |
| Leakage Rate | A→AB: ≤0.02% Kvs; B→AB: ≤0.2% Kvs | At Δp=0.1MPa |
| Mounting Position | Vertical to horizontal installation available | No special angle restrictions |
| Fail-Safe Function | Port A→AB closes automatically upon power loss (spring return) | Safety protection feature |
| Physical Parameters | ||
| Dimensions (L1×L2×L3×H2) | 95×47.5×52.5×260mm | Under straight flow status |
| Weight | 4.2kg |
- Full Series Model List
| Model | DN | Kvs (m³/h) | Connection Type | Applicable Medium | Remarks |
| MXG461.15-0.6 | 15 | 0.6 | External thread | Cold & hot water | Standard model |
| MXG461.15-1.5 | 15 | 1.5 | External thread | Cold & hot water | Standard model |
| MXG461.15-3.0 | 15 | 3 | External thread | Cold & hot water | Standard model |
| MXG461.20-5.0 | 20 | 5 | External thread | Cold & hot water | Current model |
| MXG461.25-8.0 | 25 | 8 | External thread | Cold & hot water | Standard model |
| MXG461.32-12 | 32 | 12 | External thread | Cold & hot water | Standard model |
| MXG461.40-20 | 40 | 20 | External thread | Cold & hot water | Standard model |
| MXG461.50-30 | 50 | 30 | External thread | Cold & hot water | Standard model |
| MXG461.XX-XXP | 15-50 | 0.6-30 | External thread | Mineral oil | Version for oil media |
| MXG461.XX-XXU | 15-50 | 0.6-30 | External thread | Cold & hot water | Version with NPT fittings |
| MXF461.XX-XX | 15-65 | 0.6-50 | Flange | Cold & hot water | Flanged version |
- Cross-Brand & Replacement Model Reference
| Category | Model | Matching Rate | Differences |
| Siemens Equivalent Models | MXG461.20-5.0P | 100% | Only seal material changed to FPM, suitable for mineral oil |
| MXG461.20-5.0U | 100% | Supplied with NPT thread fittings for easier installation | |
| MXF461.20-5.0 | 95% | Flanged connection type, different mounting method | |
| Domestic Alternatives | Muyi MVC20-5.0 | 90% | Identical functions, approx. 60% of Siemens price, response time 2-3s |
| Chuanyi ZDLP-20K | 85% | Electric actuator, slightly lower accuracy, IP65 rating | |
| Imported Competitors | Honeywell V5011P2010 | 90% | Similar structure and price, positioning time around 2s |
| Danfoss AVTA20-50 | 85% | Slightly different flow characteristics, operating temperature 2-120℃ |
- Application Environment & Industry Cases
5.1 Applicable Scenarios
HVAC Systems: Cold/hot water mixing control and fan coil unit temperature regulation for commercial buildings, hotels and hospitals
District Heating: Secondary hot water temperature control for residential communities and office parks
Industrial Temperature Control: Water flow regulation for chillers and heat pumps, cooling systems for data centers
Process Cooling: Temperature control loops for plastic molding machines and printing equipment
5.2 Not Recommended Scenarios
Media with solid particles (A pre-filter with filtration accuracy ≥100μm is required)
Vacuum systems or working conditions with high pressure differential (>300kPa)
Diverting flow applications (For mixing and straight flow only)
Corrosive media (Select MXG461S stainless steel version)
5.3 Typical Application Cases
Case 1: HVAC System of Commercial Complex
Project: HVAC water system renovation for a 30-floor shopping mall
Application: Cold and hot water mixing control for air handling units on each floor, total 80 sets of MXG461.20-5.0
Outcome: Temperature control accuracy improved to ±0.5℃, energy consumption reduced by 18%, response speed tripled
Case 2: Industrial Water Chiller
Equipment: 500RT screw chiller
Application: Chilled water outlet temperature control (7℃), 4 units operated in parallel
Features: Matched with Siemens PLC for 0-10V proportional control, water temperature fluctuation stabilized below 0.3℃
- Troubleshooting & Maintenance Guide
| Fault Phenomenon | Possible Causes | Troubleshooting Steps | Solutions |
| Valve fails to operate | 1. No power supply | 1. Measure terminal voltage (24V±20%) | 1. Repair power circuit |
| 2. Missing control signal | 2. Check 0-10V/4-20mA control signal | 2. Inspect controller output | |
| 3. Actuator failure | 3. Manual operation test (Turn handwheel clockwise) | 3. Replace ASE1 electronic module | |
| Poor regulating accuracy | 1. Position offset | 1. Perform auto-calibration (Long press calibration button) | 1. Recalibrate the valve |
| 2. Incorrect valve characteristic setting | 2. Check DIP switch (Linear / Equal percentage) | 2. Reset DIP switch | |
| 3. Impurities in medium | 3. Inspect filter cleanliness | 3. Clean the filter | |
| Excessive leakage | 1. Aged seals | 1. Check seal condition | 1. Replace EPDM seals |
| 2. Worn valve seat | 2. Measure leakage under closed status | 2. Replace valve seat assembly | |
| 3. Excessive pressure differential | 3. Confirm system pressure differential ≤300kPa | 3. Install bypass valve to reduce pressure difference | |
| Abnormal feedback signal | 1. Faulty feedback wiring | 1. Measure feedback terminal voltage (0-10V) | 1. Repair feedback wiring |
| 2. Damaged electronic module | 2. Check module indicator lights | 2. Replace electronic module | |
| 3. Defective inductive sensor | 3. Inspect sensor connection | 3. Replace inductive sensor |
Maintenance Schedule
| Maintenance Item | Cycle | Operation Content |
| Visual Inspection | Monthly | Check valve body and actuator for damage and loose connections |
| Filter Cleaning | Quarterly | Clean inlet filter to prevent impurity ingress |
| Auto-Calibration | Semi-annually | Execute auto-calibration to ensure positioning accuracy |
| Seal Inspection | Annually | Check seal aging and replace if necessary |
| Overhaul | Every 3 years | Dismantle for internal inspection and replace wearing parts |
- Selection Guidelines
- Three Key Selection Factors: DN size (match pipeline) → Kvs flow rate (meet system demand) → Medium type (Standard type for cold/hot water, Type P for mineral oil)
- Signal Selection: DC 0-10V for general control; DC 4-20mA for long-distance transmission (strong anti-interference)
- Installation Tips: Follow the flow direction marked on the valve body; do not use as diverting valve; 4-wire connection for power and signal ensures higher stability
- Fault Judgment: Automatic shutdown after power loss (spring return) is a standard safety function; manual operation can quickly verify mechanical performance
- Ordering Information
Standard Model: MXG461.20-5.0 (BPZ:MXG461.20-5.0)
Recommended Accessories: ALG203 thread fitting set (3 union nuts + 3 gaskets + 3 plain washers), Z155/20 blind flange set
Replacement Module: ASE1 electronic module (Applicable for DN15-32)
Supplementary Application Description
MXG461.20-5.0 is a DN20 solenoid proportional modulating valve with Kvs=5.0. It is mainly used for continuous and precise temperature control in closed cold and hot water systems. Featuring fast positioning (<2s) and high resolution (1:1000), it is only applicable for mixing and straight flow, not for diverting service.
- HVAC & Refrigeration (Primary Application)
Air Handling Units / Fresh Air Units: Proportional regulation of cold/hot water coils to stabilize supply air temperature (±0.5℃)
Fan Coil Units (FCU): Terminal temperature control for high-rise and commercial buildings, available for 2-way on/off or 3-way mixing flow
Chilled Water Systems: Water temperature regulation and bypass mixing control for chillers
Cooling Tower Control: Stabilize cooling water temperature and save energy
Computer Room Precision Air Conditioning: High-precision water temperature control for data center and equipment room cooling
- District Heating & Boiler Systems
Heat Exchanger Stations: Secondary hot water temperature regulation and mixing loop control
Radiant Floor Heating: Limit supply water temperature (35–45℃) and prevent overheating via 3-way mixing
Boiler Load Control: Stabilize hot water outlet temperature and follow system load changes
Domestic Hot Water (DHW): Mix cold and hot water to provide constant-temperature water (e.g. 45–55℃)
- Industrial Process & Special Media
Process Cooling: Precise cooling water temperature control for injection molding machines, printing machines and lasers
Mold Temperature Controllers: Proportional regulation for thermal oil and hot water circuits (Type P for mineral oil)
Food & Pharmaceutical Industry (Sanitary Application): Closed-loop temperature control for pure water and hot water
Solar Water Heating Systems: Mix water from solar collectors and return water for constant water supply
- Typical Circuit Applications
3-way Mixing (Combining Flow): Mix high-temperature primary water and low-temperature secondary water to stabilize supply water temperature (most common application)
2-way Straight Flow: On/off or proportional regulation for coil/equipment inlet, automatic shutdown upon power loss for safety
Bypass / Differential Pressure Control: Stabilize system pressure difference and balance flow under partial load
- Disqualified Application Scenarios
❌ Media with solid particles (Pre-filter ≥100μm required)
❌ Diverting flow service (Mixing and straight flow only)
❌ Vacuum conditions, high pressure differential (>300kPa) or highly corrosive media
❌ Steam systems (Operating medium: cold/hot water and thermal oil, 1–130℃)
- Application Matching Based on Core Advantages
Fast Response (<2s): Ideal for systems with fluctuating load requiring rapid temperature stabilization, such as HVAC terminals and process cooling
High Resolution (1:1000): Suitable for high-precision temperature control scenarios including precision air conditioning, pharmaceutical and electronic manufacturing
Power-off Safety (Port A→AB Closed): Safety loop for heating and hot water systems to avoid overheating and scalding risks
