Pressure Candle Filters

    The pressure candle filter features pre-coat, spray rinse residual liquid treatment, filter cake layer filtration, and material thickening. It is a fully enclosed, fully automatic filter that can operate in multiple modes.
The pressure candle filter (also known as a multi-tube filter cake filter) integrates multiple tubular filter elements inside a single unit. When the pressure differential reaches a certain level after filtration, the liquid is drained, and the filter cake is removed by back-blowing. The filter elements are reusable.
Technical Features of Pressure Candle Filter
1.Direct filtration, pre-coat filtration, slurry concentration, filter cake recovery, and washing;
2.Enclosed filtration, pollution control, suitable for highly corrosive, volatile, or hazardous liquids;
3.Dry design available for recovering relatively dry filter cake;
4.Tail-end liquid exhaust design to reduce material waste;
5.Main body is static with dynamic back-blow, low failure rate, and low operating cost.
Pressure candle filter working principle

Filter Element Structure & Cake Removal
Filtration State: Liquid passes through the filter cloth, flows from the porous tube to the center tube, then to the collecting manifold. The filter cloth is pressed against the outer surface of the support tube. The concave-convex support tube increases the filtration area and helps hold the filter cake, preventing it from falling off, thus stabilizing the filtration effect.
Back-blow State: Back-blow gas is introduced, flowing from the non-porous center tube to the porous tube. The filter cloth bulges and becomes round, effectively shaking off and peeling the filter cake. It also removes fine particles trapped in the filter cloth fibers, improving back-blow efficiency and quickly restoring the filter cloth's filtration capability.

Technical Parameters

Parameter	Value
Sub-series	JQZC, JQZV, JQZM, JQZN, JQZE
Filtration Precision	0.22–100μm (depending on filter element and design)
Standard Design Pressure Ratings	0.6MPa / 1.0MPa / 1.6MPa / 2.0MPa (higher available on request)
Filter Elements	Seamless filter cloth, metal wedge wire, metal sintered mesh, metal powder sintered, polymer microporous tube
Max Design Temperature	0–300°C
Flow Rate Range	10–300 m³/h
Filtration Area	0.9–60 m² (larger sizes available on request)
Shell Diameter	350–2500mm
Back-blow Pressure Differential	0.2–0.3 MPa
Shell Material	304, 316L, CS; special materials available (titanium, Hastelloy, duplex stainless steel)
Discharge Valve	Soft-seal or hard-seal butterfly valve

Application Industries
Applicable Industries: Petrochemical, fine chemical, food & beverage, water treatment, resin, oil & fat, coal chemical, etc.
Applicable Liquid Types: Resin, polybutene resin, alkyd resin, epoxy resin, beer, edible oil, syrup, citric acid, gelatin, regenerated wax, cutting oil, fuel oil, lubricating oil, machining coolant, etc.
Main Filtration Functions: Direct filtration, pre-coat filtration, slurry concentration, filter cake recovery & washing
Filtration Type: Direct filtration and pre-coat filtration, back-blow discharge