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Description
This hydraulic diaphragm backflush valve serves as a specialized control component for automatic backflush filtration systems in agricultural irrigation. Driven by pipeline system pressure, the valve performs two-way switching to enable filter backflush operations without external power sources. Its design features a limited number of moving parts, supporting continuous operation with scheduled maintenance. The valve facilitates flow direction changes by closing the inlet while opening the drain port during backflush cycles, and reversing this configuration during normal filtration. Available in 2", 3", and 4" sizes with thread or bayonet connections, these valves integrate with multi-unit automatic backflush filtration systems that protect drip irrigation, sprinklers, and other irrigation equipment.
During normal filtration, the inlet and outlet remain connected, allowing water to flow forward through the filter unit. The valve core assembly seats in the lower position, maintaining the drain port in a closed state. Water passes through the filter element and proceeds to the irrigation system.
When a hydraulic signal activates, pressurized water enters the diaphragm control cavity. As pressure increases within this cavity, the diaphragm moves, driving the valve core assembly upward. The valve core assembly rises until it seals against the upper seat, closing the inlet port completely. In this position, the drain port opens, creating a flow path from the outlet to the drain. Water flows in reverse, entering through the outlet as filtered water from adjacent units, passing backward through the filter element, and exiting through the drain port to remove accumulated contaminants.
When the hydraulic signal ceases and water discharges from the control cavity, pipeline pressure combined with spring elasticity returns the valve core assembly to the lower seat. The drain port closes, and the valve resumes normal filtration mode with inlet and outlet connected.
Technical Parameters
Interface | Connection Type | Cavity Capacity (L) | Maximum Pressure (kg/cm²) | Working Pressure (bar) |
2" | Thread / Bayonet | 0.13 | 10 | 0.7-10 |
3" | Bayonet | 0.34 | 10 | 0.7-10 |
4" | Bayonet | 0.55 | 10 | 0.7-10 |
Parameter | Specification |
Valve Type | Hydraulically operated diaphragm control valve |
Standard Pressure Rating | 10 kgf/cm² |
Minimum Operating Pressure | 1.0 kgf/cm² (0.7 bar) |
Working Pressure Range | 0.7-10 bar |
Body Material | PA (Polyamide) engineering plastic |
Drive Mechanism | Diaphragm with removable assembly |
Core Assembly | Plastic valve core with enhanced sealing |
Function | Two-way switching for filter backflush |
Suitable For | Automatic backflush filtration systems in irrigation |
Maintenance | Online inspection with removable drive |
Mode | Inlet State | Outlet State | Drain Port State | Flow Direction |
Filtration Mode | Open | Open | Closed | Inlet → Outlet (forward flow) |
Backflush Mode | Closed | Open (as inlet) | Open | Outlet → Drain (reverse flow) |
Size | Connection | Cavity Capacity | Typical Flow Range | Application |
2" | Thread/Bayonet | 0.13 L | 3-35 m³/h | Small irrigation filter systems |
3" | Bayonet | 0.34 L | 20-60 m³/h | Medium irrigation systems |
4" | Bayonet | 0.55 L | 40-100 m³/h | Large agricultural projects |
Custom Option | Details |
Connection types | Threaded or bayonet options available |
Pressure ratings | Higher pressure ratings upon request |
Material options | Alternative engineering plastics available |
Special configurations | Custom designs for specific irrigation applications |
Product Uses
This backflush valve integrates with automatic backflush filtration systems in agricultural irrigation:
Multi-unit automatic filter systems for farms with at least two parallel filtration units
Screen filter systems for drip irrigation installations
Disc filter systems for greenhouse irrigation operations
Sand filter systems treating surface water from rivers and canals
Parallel filter configurations for large-scale agricultural projects
Water treatment applications in agricultural processing facilities
Product Operate Guide
Install the backflush valve at the designated position in the filter manifold system, following the flow direction marking on the valve body.
Mount the valve in an accessible location with adequate space for the removable drive assembly.
Connect inlet, outlet, and drain ports according to system design. Apply PTFE tape to male threads for threaded connections. Ensure proper engagement and locking for bayonet connections.
Connect the hydraulic control line from the controller to the diaphragm control cavity port. Secure tubing and eliminate kinks or restrictions.
Slowly pressurize the system and check all connections for leaks. Verify valve operation by initiating a manual backflush cycle.
Conduct routine inspections to check for leaks at connections, verify valve operation during backflush cycles, and inspect control line connections for damage.
Remove the drive assembly independently for inspection without disturbing the valve body or pipeline connections. Inspect the diaphragm for wear or damage and clean the control cavity if necessary. Reassemble and verify operation.
FAQ
The valve operates using pipeline pressure. During normal filtration, inlet and outlet are connected, supplying water to irrigation systems. When control pressure enters the diaphragm cavity, the valve core moves upward, closing the inlet and opening the drain port. Water then flows in reverse from outlet to drain for backflushing, using filtered water from other filter units.
The minimum operating pressure is 1.0 kgf/cm² (0.7 bar). The valve requires at least this pressure for operation in irrigation systems.
The standard pressure rating is 10 kgf/cm², suitable for most agricultural irrigation systems. Higher pressure ratings are available upon request.
The valve body is manufactured from PA (Polyamide) engineering plastic, which resists corrosion, acids, alkalis, and agricultural chemicals used in fertigation.
The drive assembly can be removed independently for online inspection and maintenance without disturbing the valve body or pipeline connections. This allows diaphragm inspection and cleaning without shutting down the entire irrigation system.
