CHG Metal manufactures circular filter leaves for pressure leaf filter systems that require a round profile, a central mounting interface or a shell-matched geometry.
The leaf can be supplied as a full circle, partial circle, teardrop or drawing-based profile with a continuous circular frame, multi-layer mesh, drainage core, center hole, hub, flange or guide lugs.
Shape and Housing Fit
Circular filter leaves can be designed as a full circular element or as a partial shell-contoured profile.
The outer frame follows the required shape and supports the mesh against differential pressure and cake load. Roundness, local curvature, thickness and edge closure affect the fit with the housing, guide rails and adjacent leaves. For horizontal shell applications, the outer profile may follow the vessel radius; for round disc-style applications, the leaf may use a center hole or hub instead of a peripheral support frame.
Hub, Flange and Center Interface
The center interface can be a simple center hole, a machined hub, a flange, a threaded connection or a combination of these features. It may serve only as a mounting and locating point, or it may also provide a filtrate channel. CHG Metal reviews the center hole diameter, hub OD, flange OD, bolt circle, seal groove, keyway, shaft clearance and outlet position before manufacturing. The function of the center interface must match the actual product design; a locating hub is not automatically a filtrate channel.
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Center Interface |
Dimensions to Check |
Typical Function |
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Center hole |
Hole diameter, tolerance, center position and thickness |
Locating or passage for a bolt or shaft |
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Hub |
OD, ID, shoulder, keyway and seal groove |
Shaft fit, location or filtrate collection |
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Flange |
Flange OD, hole pitch, hole count, thickness and flatness |
Bolted connection and sealing |
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O-ring/gasket |
Groove width, depth, section and material |
Prevents bypass and leakage |
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Guide lug/tab |
Position, width, angle and clearance |
Works with the rail to limit rotation and movement |
Dimensions and Customization
Circular filter leaves are manufactured to the vessel or equipment drawing. The manufacturing drawing should define outer diameter or profile, inner diameter or center-hole size, overall thickness, flatness, roundness, center position, mesh layers, frame profile, edge closure, hub or flange dimensions, guide points and any required heat number or material certificate. For replacement work, the existing leaf or a measured dimension sheet can be used as the starting point.
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Parameter |
Reference/Custom Range |
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Shape |
Full circle, partial circle, teardrop and shell-contoured |
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Filtration rating |
10–200 µm reference |
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Support mesh opening |
0.5–2.0 mm reference |
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Surface wire diameter |
0.14–0.25 mm |
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Support wire diameter |
0.28–0.50 mm |
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Materials |
SS304, SS316L, SS904L, Hastelloy C276 and Monel 400 |
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Weave |
PDW, TDW and square support mesh |
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Frame |
Roll-formed C-channel arc frame |
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Center interface |
Center hole, hub, flange, seal groove and guide lug |
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Inspection |
Outer profile, roundness, flatness, center position, hole pattern and sealing face |
Circular vs Rectangular Leaves
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Comparison |
Circular Leaves |
Rectangular Leaves |
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Typical housing |
Circular shells, disc-style equipment or rotating installation |
Rectangular/square housings or long panel spaces |
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Effective area |
Continuous arrangement around a circular shell |
Regular rectangular frames and larger flat panel area |
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Frame feature |
Continuous curved frame without right-angle corners |
Straight edges and corner construction with a different assembly method |
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Center interface |
Commonly uses a center hole, hub or flange |
Commonly uses top suspension, side rails and a bottom nozzle |
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Cake discharge |
Suits curved shells and rotating/gravity discharge |
Suits vibration discharge or full-set withdrawal |
Manufacturing and Quality Inspection
Manufacturing includes material certificate review, mesh cutting, layer alignment, drainage-core assembly, circular frame forming or rolling, hub or flange machining, welding or edge fixing, mesh tensioning and final assembly. Inspection covers outer diameter or profile, roundness, flatness, thickness, center position, hub bore, flange hole pattern, seal groove, mesh count, wire diameter, edge closure and surface condition. First-piece inspection can be used for replacement projects where the original housing fit is critical.
FAQ
Q: How do circular filter leaves perform compared to rectangular leaves in horizontal vessels?
A: Circular filter leaves match the interior radius of horizontal vessel shells, allowing you to maximize active filtration surface area within the same vessel footprint while eliminating dead space where slurry can settle.
Q: What prevents circular filter leaves from swaying during high-frequency cake vibration?
A: Our leaves feature top alignment lugs and side stabilizer brackets that ride along the vessel support rails. This dual-point guiding system keeps the leaf vertical and locked in alignment with the bottom manifold during dynamic vibratory cake discharge.
Q: Are these circular filter leaves compatible with automated shell-retractable filters?
A: Yes. Every leaf is custom-fabricated to match the exact center-to-center spacing, guide track dimensions, and manifold socket geometry of major OEM horizontal shell-retractable filtration systems.
Q: When should circular filter leaves be used?
A: Use circular leaves when the housing, guide system, center shaft or installation space requires a round or shell-contoured profile, or when a filter disc shape is needed.
Q: How is the center hub or flange selected?
A: The center interface is selected from its actual function: locating, shaft connection, sealing or filtrate collection. The center hole, hub, flange, seal groove and bolt pattern are made to the equipment drawing.
Q: What dimensions are needed for a quotation?
A: Please provide outer diameter or profile, inner diameter or center hole, thickness, center position, roundness or flatness requirement, hub or flange dimensions, mesh, material, housing drawing and quantity.
Q: What material and mesh options are available?
A: SS304, SS316L, SS904L, Hastelloy C276 and Monel 400 are available, with PDW, TDW or square support mesh and a 10–200 µm reference filtration range.
Request a Quote
Send the circular leaf drawing, housing dimensions, center hub or flange details, mesh requirement and operating conditions to CHG Metal. Our team will review the shape, center interface, frame and mesh construction, then provide a manufacturing drawing and quotation.
