Coalescing Filters

Part No: DD970F

Core Technical Specifications

Filtration Grade: DDp Medium Precision Coalescing

Absolute Filtration Precision: Solid particles ≥1 μm, liquid oil/water aerosols ≥1 μm

Residual Liquid Oil Content Outlet: ≤0.1 mg/m³, meets ISO 8573-1 Class 3 compressed air standard

Filtration Efficiency: 99.99% capture efficiency for 1 μm liquid aerosols

Filter Media: Multi-layer gradient hydrophobic borosilicate micro glass fiber composite, outer blue oleophobic anti-static anti-re-entrainment foam sleeve

Mounting: Exclusive 4-hole central mandrel bayonet twist-lock interface

Operating Limits

Max Working Pressure: 1.6 MPa (16 bar / 232 PSI)

Continuous Operating Temperature: 2°C ~ 80°C

Standard Replacement Cycle: Replace after 4,000 operating hours or 12 months, whichever comes first

Differential Pressure Thresholds

Initial clean differential pressure: ≤0.013 MPa

Mandatory replacement alarm: ΔP ≥ 0.07 MPa

Sealing & Support Construction

End Caps: Reinforced corrosion-resistant black PA polyamide 4-hole locking end cap

Seal: Integrated full-circle NBR nitrile rubber gasket, zero air bypass leakage

Inner & Outer Cage: Double-layer perforated 304 stainless steel mesh, anti-collapse under full large-volume airflow load

Key Product Advantages

Intermediate polishing stage to protect high-cost downstream precision filters

Installed after PD970F particulate prefilter, this blue DDp element traps bulk condensed water, coarse oil droplets and 1 μm fine liquid aerosols that pass the primary dust filter. It greatly reduces liquid contamination load on QD970F ultrafine coalescer and QD+ activated carbon cartridges, extends their service life and cuts overall system maintenance & spare parts cost.

Large liquid holding capacity for high-humidity heavy industrial environments

Thick deep-pleated gradient glass fiber matrix stores massive volumes of condensed oil and condensate, resisting rapid saturation in large factories with underperforming aftercoolers or refrigerated dryers.

Low airflow resistance to reduce central compressor station energy consumption

Optimized deep-fold glass fiber maximizes effective filtration area, maintaining stable low pressure drop under 24/7 full-load continuous large-volume operation, lowering extra power consumption of large screw air compressor units.

Hydrolysis & abrasion resistant media with no fiber shedding

Oleophobic borosilicate glass fiber combined with stainless steel support cage prevents fiber detachment under long-term humid high-flow compressed air impact, eliminating secondary pipeline contamination to downstream large pneumatic valves and precision processing equipment.

Exclusive 4-hole bayonet quick swap design without full housing disassembly

Unique 4-hole central positioning metal mandrel perfectly matches DD970+F main line filter housings; a single operator can complete cartridge replacement within 3 minutes without removing the entire filter tank.

Working Principle

Pre-cleaned compressed air from PDp particulate prefilter flows outside-in through the filter cartridge:

Bulk condensed water and large solid particles are blocked by outer blue hydrophobic foam layer;

Medium-sized oil & water aerosols collide and coalesce into large liquid droplets through multi-layer gradient borosilicate glass fiber media;

Outer anti-re-entrainment foam prevents coalesced liquid droplets from being blown back into high-speed large-volume airflow;

Application Industries

Large metal machining workshops, heavy metal forging plants, sandblasting workshops, textile printing factories, large packaging printing equipment, medium & large factory centralized air compressor stations, construction machinery air supply systems, full-automatic large pneumatic automation production lines, laser cutting equipment, food & beverage mass production, low-demand food packaging equipment.