These automatic fill valves use a float mechanism and supply-water pressure to maintain the water level in a tank. Falling water opens the valve; rising water closes the inlet at the set level. The mechanism operates without electrical wiring or an external controller.
The 304 stainless steel body and threaded connection suit clean-water storage and replenishment systems. Applications include rooftop tanks, residential reservoirs, industrial water storage, irrigation supplies and the water-supply side of solar water-heater systems.
| Configuration | Pipe layout | Mounting options |
|---|---|---|
| Top inlet | Supply enters from above through the straight connection | Internal or external installation |
| Side inlet | Supply enters horizontally through the elbow connection |
An internal valve mounts inside the tank or water tower. An external version mounts outside and uses a connecting hose to follow the tank level, allowing access where internal space is limited. Specify the required version and complete connection arrangement.
| Parameter | Specification |
|---|---|
| Type | Automatic float-operated water level control valve |
| Body material | 304 stainless steel |
| Threaded connection material | 304 stainless steel |
| Nominal connection sizes | 1/2in, 3/4in and 1in |
| Operating temperature | 0–70°C |
| Working pressure | 0.1–10bar |
| Medium | Clean water |
| Control | Mechanical float and water-pressure actuation |
| Electrical supply | Not required |
| Filtration | Dual filtration structure with inlet filter |
Use the 70°C limit for the complete valve assembly. The stainless steel body alone does not determine the temperature capability of the internal float and sealing components.
The following interface measurements identify the pictured internal configurations. Values are in mm; they are dimensional references, separate from the nominal pipe-size designation.
| Inlet configuration | Nominal size | Illustrated interface dimension |
|---|---|---|
| Top inlet, male thread | 1/2in | 20.6 |
| 3/4in | 25 | |
| 1in | 32 | |
| Side inlet, female elbow | 1/2in | 20 |
| 3/4in | 25 | |
| 1in | 32 |
Specify the exact thread standard and mating fitting when selecting a connection. The dimensional attachment includes the stainless steel configurations in a separate section.
The inlet filter and internal filtration structure help protect the closing mechanism from debris. A serviceable retaining arrangement allows the filter to be removed for inspection and cleaning. Keep the water passages and moving float clear so the valve can refill and shut off correctly.
Choose the inlet orientation, internal or external mounting, nominal connection and installation space for the tank. Check that the supply pressure remains within 0.1–10bar; insufficient pressure can affect filling speed and closing performance. Flush the supply pipe, provide access for maintenance and test the automatic filling and shutoff sequence after installation.
Use clean, noncorrosive water. Avoid steam, heavy sludge, corrosive liquids and large particles. For heated systems, verify that water reaching the valve remains within 0–70°C. Connection dimensions, mounting structure, material and inlet orientation can be specified for the project.
