Four-way valve for reverse osmosis systems

The four-way membrane valve is a key control component in reverse osmosis (RO) systems, responsible for automatically starting and stopping water flow to the membrane. It operates based on pressure balance between the inlet line and the storage tank: once the tank is full, the valve automatically shuts off the feed water to prevent unnecessary drain flow and reduce system wear.

With its built-in diaphragm mechanism and four independent ports, the valve controls both inlet and outlet flow, ensuring stable filter performance and protecting the RO membrane.

Key functions:

✅ Automatically shuts off water when the tank is full
✅ Restarts flow when pressure drops (water is drawn from faucet)
✅ Stabilizes membrane performance
✅ Prevents water waste and excess drain
✅ Protects against unfiltered water reaching the tank

Technical specifications:

▪️ Valve type: four-way automatic shutoff valve
▪️ Housing material: food-grade chemically resistant polypropylene
▪️ Max operating pressure: up to 5 bar
▪️ Water temperature: +5 to +45 °C
▪️ Connections: 4 × 1/4" (6.35 mm) ports, push-fit with locking clips
▪️ Cycle life: up to 20,000 on/off cycles

Applications:

▪️ All types of reverse osmosis systems, with or without storage tanks
▪️ Residential and commercial use

Why a high-quality valve matters:

If the valve fails:
▪️ Water continuously drains — massively increases water waste
▪️ Filters and membrane wear out quickly
▪️ A damaged diaphragm may allow unfiltered water into the tank — a health risk

Benefits:

▪️ Universal fit – compatible with most RO systems
▪️ Saves water and extends filter life
▪️ Leak-proof and reliable under pressure fluctuations
▪️ Long-lasting and reusable
▪️ Quick installation – tool-free push-fit system

The 1/4" four-way valve for RO systems is a compact yet essential component that ensures optimal system operation, protects your membrane, and reduces water consumption. A must-have for any RO system with a tank — and highly recommended for reliable, safe filtration.