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Description
This 4-inch backflush valve is a single-cavity hydraulic diaphragm valve engineered for automatic backflush filtration systems in agricultural irrigation. Its low-pressure drive structure reduces diaphragm stress during operation. Constructed from PP (Polypropylene), the valve body resists corrosion, acids and alkalis common in agricultural irrigation environments, enabling flow direction switching between filtration and backflush cycles. It supports commercial procurement for medium to large-scale filtration systems. Customization options include 4" or 3" sewage outlet sizes, alternative connection types, custom pressure ranges, and alternative engineering plastics upon request.
Custom Option | Details |
Sewage outlet size | 4" or 3" options available |
Connection type | Bayonet standard; other options upon request |
Pressure ratings | Custom pressure ranges available |
Material options | Alternative engineering plastics upon request |
Technical Parameters
In/Outlet | Sewage Outlet | Connection Method | Working Pressure (bar) | Weight (kg) |
4" | 4" | Bayonet | 0.5-10 | 5.5 |
4" | 3" | Bayonet | 0.5-10 | 5.5 |
In/Outlet | Sewage Outlet | A | B | C | H |
4" | 4" | 316 | 175 | 189 | 312 |
4" | 3" | 316 | 175 | 189 | 312 |
Parameter | Specification |
Valve Type | Single-cavity hydraulic diaphragm valve |
Body Material | PP (Polypropylene) |
Spool Assembly | Plastic with enhanced sealing |
Drive Design | Low-pressure drive reduces diaphragm stress |
Connection Type | Bayonet |
Working Pressure Range | 0.5-10 bar |
Operation | Hydraulically actuated |
Flow Change | Short stroke for gradual transition |
Suitable For | Automatic backwash filters, disc filters, shallow media filters, water supply systems |
Mode | Inlet State | Outlet State | Sewage Port State | Flow Direction |
Filtration Mode | Open | Open | Closed | Inlet → Outlet (forward flow) |
Backflush Mode | Closed | Open (as inlet) | Open | Outlet → Sewage (reverse flow) |
Product Features
The single-cavity structure is optimized for low-pressure operation, reducing excessive diaphragm stress and supporting consistent performance in systems with variable pressure.
Made of PP material, the valve body resists corrosion, acids and alkalis, making it compatible with fertilizer injection systems and diverse agricultural water sources.
The precision-molded plastic spool assembly provides sealing in both filtration and backflush positions, and withstands chemical exposure from fertilizers and treated water.
A short stroke enables gradual flow direction changes, eliminating water hammer, preventing pressure surges, and avoiding mixing of clean water and sewage during transitions.
With minimal moving parts and a 5.5 kg weight, the valve simplifies installation and reduces stress on pipeline connections during system assembly.
The straightforward design allows for simple inspection and maintenance without complex disassembly, reducing potential failure points and associated downtime.
Product Uses
This valve serves key functions in:
Automatic backwash filter systems with disc or shallow media filters for agricultural irrigation
Disc filter systems requiring backflush flow switching
Multi-tank shallow media filter systems
Water supply pipelines for flow direction control (angle-type and straight flow configurations available)
Parallel multi-unit filtration systems enabling non-shutdown automatic cleaning
Large-scale agricultural irrigation projects
Mount the valve in the filter manifold with correct flow orientation, in an accessible location with adequate space.
Connect inlet, outlet and sewage ports via bayonet fittings, ensuring proper locking.
Attach the hydraulic control line from the controller to the control chamber, securing tubing and avoiding kinks.
Slowly pressurize the system, check for leaks, and test operation with a manual backflush cycle.
Regularly inspect connections for leaks, valve operation during cycles, and control line integrity.
Periodically check the diaphragm for wear, spool movement smoothness, control cavity cleanliness, and bayonet connection security.
FAQ
It operates within 0.5 to 10 bar, compatible with most irrigation system pressures.
The body is PP (Polypropylene), and the spool assembly is plastic with enhanced sealing.
4" and 3" sewage outlet connections are offered to match system requirements.
It reduces diaphragm stress, supporting extended service life in variable pressure systems.
It enables gradual flow changes, eliminating water hammer, pressure surges, and cross-contamination between clean water and sewage.
