Structural Composition

Filter Housing: Made of carbon steel (Q235) / stainless steel (304/316L), vertical pressure-bearing structure, compatible with pipeline flange connection.

Filter Element: Stainless steel wedge wire screen / woven mesh / sintered mesh, lined with PTFE scraper on inner wall, wear-resistant and corrosion-resistant.

Drive System: Double-acting cylinder (standard air supply pressure: 0.4–0.8MPa), controlled by solenoid valve; explosion-proof grade Exd II BT4 optional.

Cleaning Mechanism: Annular scraper / scraping disc, driven by cylinder to reciprocate up and down to scrape contaminants off the inner surface of filter screen.

Blowdown System: Pneumatic ball valve / butterfly valve, interlocked with cylinder to automatically discharge concentrated contaminated liquid.

Control System: PLC / microcomputer controller, supports three trigger modes: differential pressure, timing and manual; equipped with fault alarm and signal feedback function.

Working Principle

Filtration Stage:Fluid enters the housing through the inlet and flows outward through the filter screen from inside to outside. Solid contaminants are trapped on the inner wall of the screen, and purified fluid exits from the outlet.

Cleaning Trigger:When screen clogging causes the inlet-outlet differential pressure to reach the set value (adjustable: 0.05–0.3 MPa), or the preset cleaning cycle expires (adjustable: 1–24 h), the control system activates the cleaning program.

Cleaning & Blowdown Stage:The cylinder drives the scraper to reciprocate up and down along the inner wall of the screen, scraping off attached contaminants and pushing them to the dirt collection cavity at the bottom of the housing. Meanwhile, the pneumatic blowdown valve opens to discharge contaminants with a small volume of fluid. The system maintains normal continuous flow without interruption during cleaning.

Reset Stage:After cleaning is finished, the cylinder resets, the blowdown valve closes, and the filter returns to normal filtration mode.

Applicable Standards

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

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

Electrical Control Standards: GB/T 14048.1, GB 50054

Core Advantages

Motor-free design: Driven by compressed air with outstanding explosion-proof performance, suitable for flammable and explosive working conditions such as chemical industry, oil & gas, coal mines, etc.

Compatible with high-viscosity media: PTFE scraper efficiently scrapes viscous contaminants, applicable to fluids with viscosity up to 800,000 mPa·s.

On-line maintenance-free operation: Fully automatic cleaning and blowdown without shutdown or screen disassembly, ideal for 24-hour continuous operation.

Low consumption & high efficiency: Short single cleaning cycle (30–120 seconds), blowdown water consumption ≤1% of total flow rate, low operating cost.

Excellent corrosion resistance: All wetted parts are made of stainless steel, compatible with various media including water, oil products, acid and alkali solutions.

Parameters

Item	Parameter Range	Remarks
Model	ESGF Series	Vertical / Horizontal, Brush Type / Suction Type
Nominal Diameter	DN50–DN800 (Common size: DN80–DN300)	Flange connection conforming to HG/T20592, ASME B16.5
Treatment Flow Rate	20–5000 m³/h (per unit)	Max. 8000 m³/h via parallel installation
Working Pressure	0.1–1.6 MPa (standard); High pressure version up to 2.5–4.0 MPa	Pressure class: PN6/10/16/25
Filtration Accuracy	20–4000 μm	Wedge wire screen: 50–2000μm; Woven mesh: 10–3000μm
Operating Temperature	0–65℃ (standard); High-temperature type ≤150℃	Carbon steel: ≤380℃; Stainless steel: ≤480℃
Control Mode	Differential pressure (0.3–0.5MPa), Timing (1–24h), Manual	PLC / Microcomputer control, with LED display & fault alarm
Cleaning Duration	30–180 seconds (adjustable)	Standard preset: 60 seconds
Blowdown Water Consumption	≤1% of total flow rate	Continuous flow maintained during cleaning
Motor Power	0.37–2.2 kW	380V/50Hz, IP54 protection, overload protection equipped
Materials	Housing: Carbon steel (Q235) / 304 / 316L; Filter screen: 304 / 316L; Brush: 304 stainless steel with PTFE coating	Duplex steel / titanium alloy available for customization
The above parameters are for reference only. Please contact us for detailed information.

Product Certifications