Normally Closed 1/4″ Motorized Ball Valve Auto Cut Off Low Flow Resistance
Normally Closed 1/4″ Electric Ball Valve – automatically closes upon power failure, DC12/24V, full port with low flow resistance, designed for automatic pipeline shut‑off in laboratory and fertigation equipment, with manual override.
Description
1. Core Functionality
The motorized ball valve normally closed is a miniature self‑actuated valve that remains sealed in the absence of power, preventing media leakage during power outages. Its full port motorized ball valve design ensures low flow resistance with no throttling losses. The actuator is available in 2 wire motorized ball valve (basic two‑wire) and 5‑wire feedback versions, supporting PLC‑based timed control.
A manual override is provided for temporary manual opening during maintenance. PTFE seals guarantee zero leakage for low‑flow liquids and gases. This NC version complements the normally‑open type, distinguishing it from general‑purpose HVAC motorized ball valve models.
2. Materials & Technical Specifications
| Parameter | Specification |
|---|---|
| Size | 1/4″ (DN8) |
| Operating Mode | Normally Closed (fails closed) |
| Power Supply | DC12V / DC24V |
| Body Material | Brass / 304 Stainless Steel |
| Seals | PTFE / EPDM |
| Connection | NPT female thread |
| Pressure Rating | 1000 PSI |
| Media Temperature | 0~90℃ |
| Protection Class | IP54 |
| Opening/Closing Time | 6~10 seconds |
3. Applicable Industries & Scenarios
This valve is well suited for fertigation equipment, laboratory fluid lines, small hydraulic circuits, air compressor protection lines, and precision cooling systems. It is primarily used in safety shut‑off applications, where loss of power automatically locks the line to prevent media overflow or leakage.
4. Overseas Project Case Study
A large‑scale landscape irrigation farm in Central California (4125 W Shaw Ave, Fresno, CA 93701) adopted the motorized ball valve normally closed across its fertigation branches. When the equipment shuts down or loses power, the valves automatically close, preventing fertiliser concentrate from back‑flowing and contaminating the main water supply. The full‑port construction ensures stable micro‑dosing of chemicals. After 18 months of service, no leakage has occurred, and the automated dosing precision has met all targets.
5. Advantages for Overseas Procurement
The fail‑closed feature enhances system safety. The stainless steel body resists chemical corrosion, and we support custom voltage and feedback configurations. CE certification is available, making this valve ideal for bulk overseas procurement in laboratory and fertigation sectors. It can also be supplied in pairs with the normally‑open version for complementary control.
