Structural Composition

Main Frame: Modular carbon steel / stainless steel (304/316L) frame, expandable to accommodate 3–24 filter units.

Filter Tubes: Multiple independent vertical filter tubes fitted internally with stainless steel wedge wire screen / woven mesh / sintered mesh filter elements; each tube is individually controllable.

Valve System: Pneumatic or electric ball valves / butterfly valves. Every filter tube is equipped with dedicated inlet, outlet and drain valves to achieve isolation of a single tube.

Backwashing Mechanism: Uses clean fluid from the system itself to backflush filter elements, eliminating the need for an external backwash water supply.

Control System: PLC / microcomputer controller, supporting three activation modes: differential pressure triggering, timed triggering and manual triggering, complete with fault alarm and signal feedback functions.

Working Principle

Normal Filtration Stage:Fluid enters through the main inlet manifold and is evenly distributed to each filter tube. The fluid flows through the filter element from outside to inside, with contaminants trapped on the outer surface of the element. Clean fluid then exits via the main outlet manifold.

Backwash Trigger:When the overall differential pressure reaches the set value (adjustable range: 0.07–0.13 MPa) or the preset cleaning interval expires (adjustable range: 1–24 hours), the control system initiates the single-tube backwash sequence.

Offline Single-Tube Backwashing:The control system sequentially closes the inlet and outlet valves of an individual filter tube and opens its drain valve. Clean fluid from the downstream side flows backward through the filter element from inside to outside to flush off the filter cake, which is discharged along with wastewater through the drain port. Remaining filter tubes maintain continuous filtration during backwashing, ensuring uninterrupted system flow.

Reset Stage:Upon completion of single-tube backwashing, the drain valve closes and the inlet and outlet valves reopen, returning the tube to filtration service. The system cycles through backwashing of all filter tubes until the differential pressure returns to normal levels.

Applicable Standards

Design & Manufacturing: HG/T 21637-1991, SH/T 3411

Flange Standards: GB, HG, ANSI, DIN, GOST

Electrical Control Standards: GB/T 14048.1, GB 50054

Core Features

Modular Design:Multiple filter tubes arranged in parallel; the number of filter units can be expanded according to flow demand, enabling a single unit to handle high-flow working conditions.

Zero Shutdown Backwashing:Individual tubes undergo offline backwashing while the rest keep filtering continuously, without disrupting normal system operation.

High Efficiency & Low Consumption:Single-tube backwashing only takes 10–30 seconds with extremely low fluid consumption (≤0.5% of total flow rate), and no external backwash fluid supply is required.

High Precision & Large Throughput:Filtration precision ranges from 0.5 μm to 500 μm; single unit flow capacity: 2–500 m³/h. Ultra-large flow filtration can be achieved by connecting multiple units in parallel.

High Pressure & Corrosion Resistance:Maximum overall working pressure reaches 4.0 MPa. Stainless steel construction is compatible with complex media including acids, alkalis, oils and various chemical fluids.

Parameters

Item	Parameter Range	Remarks
Model	ESGF-R Series	Modular tube bundle type, customizable with 3–24 units
Nominal Diameter	DN25–DN300 (main pipeline size)	Flange connection (HG/T20592, ASME B16.5)
Treatment Flow Rate	2–500 m³/h per unit	Flow can be expanded up to 10,000 m³/h by multiple units in parallel
Working Pressure	0.2–3.0 MPa (standard); max 4.0 MPa for high-pressure version	Pressure class: PN10/16/25/40
Filtration Precision	0.5–500μm	Wedge wire screen: 50–200 μm; woven/sintered mesh: 0.5–100 μm
Operating Temperature	0–250°C (standard, subject to sealing material)	Carbon steel ≤380°C; stainless steel ≤480°C
Control Mode	Differential pressure (0.07–0.13 MPa), timed cycle (1–24 h), manual	PLC/microcomputer control; explosion-proof type and remote communication optional
Single-Tube Backwash Duration	10–30 seconds (adjustable)	Remaining tubes maintain continuous filtration during backwashing, no system flow interruption
Backwash Fluid Consumption	≤0.5% of total flow rate	Backflushed with clean fluid from the system itself; no external water supply required
Vessel / Frame Material	Carbon steel (Q235) / 304 / 316L stainless steel	Duplex stainless steel / titanium alloy available for customization
Filter Element Material	304 / 316L stainless steel wedge wire screen / woven mesh / sintered mesh	Uniform slot precision, anti-clogging, reusable after repeated cleaning
Control Voltage	220V/380V 50Hz	Pneumatic control optional, suitable for flammable and explosive working conditions

Product Certifications