This valve is a hydraulic control valve that automatically regulates the liquid level in water tanks and water towers. When the water level drops below a preset value, the float valve opens, reducing the pressure in the upper chamber of the piston.
Product Overview
This valve is a hydraulic control valve that automatically regulates the liquid level in water tanks and water towers. When the water level drops below a preset value, the float valve opens, reducing the pressure in the upper chamber of the piston. A pressure difference is formed between the upper and lower parts of the piston, and under the action of this pressure difference, the valve disc opens to start water supply operation.
Main Features
Parameter | Specification |
Size Range | DN25~DN600(1″~24″) |
Pressure Rating | PN10~PN25 (Class 150~300) |
NominalPressure | 1.0~4.0MPa |
Temperature Range | 0℃~200℃ (standard) |
Connection Types | Flanged (GB/T 17241.6 standard) |
Body Material | Ductile Iron (QT450-10), Cast Steel (WCB), Stainless Steel (304/316) |
Trim Material | Stainless Steel (304/316) |
Seat Material | NBR, EPDM |
Test Standards | GB/T 13927, ISO 5208 |
Working Principle
1. When the water level drops below the preset value, the float valve opens.
2. This reduces the pressure in the upper chamber of the piston, creating a pressure difference between the upper and lower parts of the piston.
3. Driven by this pressure difference, the valve disc opens to supply water.
4. When the water level rises to the preset value, the float valve closes, restoring the pressure in the upper chamber of the piston.
5. The valve disc then closes to stop water supply.
Structural Features
Maintenance