Lexicon 1/2″ Automatic Water Level Control Valve (TOP Inlet) – Complete Guide – Water Saver
Water is one of the most valuable resources in our homes and industries. Yet, we often waste large amounts due to overflows in tanks and reservoirs. The Lexicon 1/2″ Automatic Water Level Control Valve is designed to solve this problem without needing electricity, using simple mechanical action to automatically stop water flow when a tank is full.
1. Introduction
The Lexicon Automatic Water Level Control Valve is a mechanical, float-less water control device designed to automatically regulate water levels in tanks, overhead reservoirs, livestock water troughs, and other water storage systems.
This specific model — 1/2-inch, TOP Inlet type — is intended for use where the inlet pipe comes from above the tank lid or top surface, making it especially useful for rooftop tanks.
2. Key Features
- Automatic water control – Fills tank automatically and stops when full.
- No electricity required – Works purely on water pressure and mechanical design.
- 1/2-inch inlet size – Standard fitting for most residential pipelines.
- Top inlet design – Ideal for tanks with top-mounted inlet connections.
- Durable materials – Made from high-quality, corrosion-resistant plastic and brass components.
- Fast filling speed – Large internal channel for high water flow rate.
- Compact size – Easier to fit in tight tank openings.
- Eco-friendly – Prevents water wastage.
3. How It Works
Unlike traditional ball float valves, this valve uses internal pressure control chambers and a diaphragm mechanism to start and stop water flow.
Step-by-step working principle:
- Tank is empty or low – The internal diaphragm opens the water inlet, allowing water to flow in.
- Water fills the tank – As the water level rises, pressure is transmitted through the sensing chamber.
- Tank is full – The pressure difference pushes the diaphragm to close the inlet, stopping water completely.
- Water is used again – When the level drops, the pressure changes, and the valve automatically opens to refill.
This means no manual switching, no electricity, and no floating ball arm that can get stuck or corrode.
4. Technical Specifications
| Feature | Details |
|---|---|
| Brand | Lexicon |
| Model | 1/2″ Automatic Water Level Control Valve |
| Inlet Type | Top inlet |
| Inlet Size | 1/2 inch (Standard BSP thread) |
| Material | High-grade plastic + brass components |
| Power Requirement | None |
| Working Pressure | 0.01 MPa – 0.6 MPa (approx. 0.1 to 6 bar) |
| Temperature Range | 0°C – 70°C |
| Flow Rate | High (depends on water pressure) |
| Applications | Overhead tanks, underground tanks, livestock troughs, water treatment tanks |
5. Advantages Over Traditional Ball Valves
| Traditional Ball Valve | Lexicon Automatic Valve |
|---|---|
| Large moving float can get stuck | Compact internal mechanism with no bulky parts |
| Slower filling speed | High flow rate |
| Needs larger space inside tank | Fits in small tank covers |
| Can corrode over time | Made from corrosion-resistant materials |
| May leak after wear | Sealed diaphragm for long life |
6. Where to Use
This valve is suitable for:
- Domestic overhead tanks – Ensures you never need to manually check water levels.
- Underground sumps – Works even in enclosed spaces.
- Industrial water tanks – For automatic filling without sensors.
- Agricultural water tanks – Keeps storage always ready for irrigation.
- Livestock drinking troughs – Maintains water level for animals automatically.
- Rainwater harvesting tanks – Prevents overflow waste.
7. Installation Guide
One of the biggest benefits is easy installation.
Tools required:
- Adjustable spanner or wrench
- PTFE thread seal tape
- Pipe cutter (if adjustments are needed)
Steps:
- Turn off water supply to the tank.
- Locate the inlet hole at the top of the tank.
- Wrap PTFE tape around the valve’s threaded connection for leak-proof fitting.
- Screw the valve into the inlet pipe fitting securely.
- Ensure the valve is in a vertical position so the mechanism works correctly.
- Turn water back on and observe filling — the valve should automatically stop at full capacity.
8. Maintenance Tips
- Check for debris – Every 6 months, clean the valve to prevent clogging.
- Avoid very dirty water – Install a small inline filter if water contains sand or sediment.
- Inspect seals – Replace O-rings if you notice drips.
- Tighten connections – Prevent leaks by checking fittings occasionally.
9. Pros & Cons
Pros:
- Zero electricity cost
- Saves water by preventing overflow
- Fits in tight spaces
- Easy to install
- Durable and long-lasting
- Works even at low pressure
Cons:
- Not suitable for extremely high-pressure pumps without a reducer
- May require occasional cleaning
- Only works in gravity-fed or pressurized water supply — not for suction systems
10. Common FAQs
Q1: Can it be used with borewell pump water?
Yes, but if the pump pressure is very high, use a pressure-reducing valve.
Q2: Will it work if the tank is far from the pump?
Yes, as long as there is enough water pressure in the pipeline.
Q3: Can it be installed horizontally?
No, for proper functioning it must be installed vertically.
Q4: How long does it last?
With proper maintenance, 3–5 years or more.
11. Cost Efficiency & Water Savings
Using this valve means:
- No electricity cost for level sensors.
- No overflowing tanks, saving thousands of liters annually.
- Reduced manual monitoring labor.
Example: If an overhead tank overflows 10 minutes daily at 10 liters/minute, that’s 3,650 liters/year wasted — enough for 20+ days of household use. This valve eliminates that loss.
12. Environmental Benefits
- Reduces unnecessary water pumping (lower carbon footprint).
- Prevents stagnant water overflow that can cause mosquito breeding.
- Encourages water conservation without manual effort.
13. Buying Tips on Flipkart
When purchasing:
- Check that the seller is Flipkart Assured for genuine products.
- Read recent customer reviews for real-life performance.
- Compare price vs. similar models (some may include extra fittings).
- Confirm return policy in case of leakage or damage.
14. Safety Notes
- Do not overtighten — plastic threads can crack.
- Avoid installing in freezing conditions.
- If used for drinking water, ensure it is food-grade certified.
15. Who Should Buy This
- Homeowners tired of tank overflows
- Farmers needing low-maintenance livestock watering systems
- Small businesses with water storage tanks
- Industrial units wanting backup tank automation without electricity
- Anyone with an irregular water supply schedule
16. Summary
The Lexicon 1/2″ Automatic Water Level Control Valve (Top Inlet) is a cost-effective, eco-friendly, and low-maintenance solution for keeping your water tanks at optimal levels without the hassle of manual monitoring or the need for electricity. Its compact size, fast flow rate, and durable construction make it ideal for both domestic and industrial applications.
By investing in this valve, you not only save money but also contribute to water conservation — an increasingly urgent priority worldwide.