SPL & DPL Wire Mesh Oil Filter Elements
SPL and DPL oil filter elements use reusable woven metal mesh discs for lubrication and oil supply systems. Standard discs combine four layers of woven wire mesh with one perforated support plate, secured by a stainless steel or aluminum ring. Discs are assembled into a stack to suit the filter housing and flow requirement.
Filtalloy manufactures replacement discs and stacks to operating requirements, drawings or existing samples.
SPL Duplex and DPL Simplex Oil Filters
SPL and DPL belong to the same mesh-disc oil filter family. SPL describes the duplex housing with two filter chambers and a 120° changeover handle. DPL describes a simplex housing with one chamber. This page covers the replaceable mesh discs and element stacks.
SPL allows flow to be switched to the standby chamber without stopping the main machine. Isolate and depressurize the dirty chamber before opening it. DPL requires shutdown and depressurization for cleaning. Changeover is a function of the housing and valve, not the disc itself.
Woven Mesh Disc Construction
- Four woven wire mesh layers plus one perforated plate support layer.
- Mesh: stainless steel, commonly 304 or 316; brass, phosphor bronze or copper.
- Frames: stainless steel or aluminum rings.
- Disc diameter, disc count, mesh and frame materials can be adjusted to an approved drawing.
- Reusable discs can be cleaned and inspected before returning to service.
Pressure and Nominal Filtration Rating
- Maximum system / housing working pressure: ≤0.8 MPa (8 bar). This is a system parameter, not an element differential-pressure rating.
- Initial pressure drop across a new element: ≤0.08 MPa (0.8 bar) at rated flow, using clean oil of 24 cSt viscosity and a 40 μm nominal element.
- Cleaning trigger: clean the element when pressure drop reaches 0.15 MPa (1.5 bar). This is a clogging / cleaning threshold, not collapse pressure or backwash pressure.
- Maximum operating temperature: 95°C, as listed in the existing specification; confirm suitability for the actual oil and assembly.
- Nominal filtration ratings: 30, 40, 80, 100, 180, 200 and 280 μm, as listed in the model table.
Woven mesh ratings are nominal; they are not absolute ratings established by ISO 16889 beta-ratio testing. Mesh opening depends on mesh count, wire diameter and weave. The separate mesh table describes mesh-material options, not the available filtration-rating range of every finished element.
Oil Filtration Applications
Typical uses include thin-oil lubrication, compatible hydraulic circuits, marine diesel-engine lubrication and fuel supply systems. Applications span power generation, metallurgy, petrochemical processing, building materials and marine equipment. The elements remove suspended solids such as metal particles, dust and particulate sludge. Selection depends on oil viscosity, flow and required cleanliness.
Framed woven metal mesh discs for SPL / DPL oil filter elements.
Oil filter disc stack installed in an assembly; individual discs can be removed for cleaning.
| Specification of SPL & DPL Oil Grease Filter Element | ||||||||
| SPL Modes | DPL Modes | Strainer DN (mm) | Rated Flow (L/min) | Filter precision (um) | Nominal Pressure (MPa) | Inner disc size (mm) | Outer disc size (mm) | Filter disc number |
| SPL-15 | — | 15 | 33.4 | 30 40 80 100 180 200 280 | 0.8 | 20 | 40 | 2-30 |
| SPL-25 | DPL-25 | 25 | 83.4 | 30 | 65 | 2-30 | ||
| SPL-32 | — | 32 | 134 | 30 | 65 | 2-30 | ||
| SPL-40 | DPL-40 | 40 | 200 | 45 | 90 | 2-34 | ||
| SPL-50 | — | 50 | 334 | 60 | 125 | |||
| SPL-65 | DPL-65 | 65 | 500 | 30 | 65 | 2-34 | ||
| SPL-80 | DPL-80 | 80 | 834 | 70 | 155 | 2-40 | ||
| SPL-100 | — | 100 | 1334 | 70 | 155 | 4-40 | ||
| SPL-125 | — | 125 | 2000 | 90 | 175 | 4-40 | ||
| SPL-150 | DPL-150 | 150 | 3000 | 90 | 175 | 6-40 | ||
| SPL-200 | DPL-200 | 200 | 5334 | 90 | 175 | 8-40 | ||
| SPL = Double Cylinder Mesh Filter | ||||||||
| DPL = Single Cylinder Mesh Filter | ||||||||
| Normal Wire Mesh We Use for SPL/DPL Oil Grease Filter Element | |||||
| Code | Mesh Number (Mesh / Inch) | Mesh Size (mm) | Filter Accuracy (um) | Wire Diameter (mm) | Percentage Sieving Area (%) |
| SPL-M010 | 10 | 2 | 2000 | 0.51 | 69 |
| SPL-M020 | 20 | 1 | 1000 | 0.25 | 64 |
| SPL-M040 | 40 | 0.45 | 450 | 0.18 | 51 |
| SPL-M060 | 60 | 0.23 | 230 | 0.19 | 44 |
| SPL-M080 | 80 | 0.2 | 200 | 0.112 | 41 |
| SPL-M118 | 118 | 0.125 | 125 | 0.09 | 34 |
| SPL-M158 | 158 | 0.09 | 90 | 0.071 | 31 |
| SPL-M200 | 200 | 0.071 | 71 | 0.056 | 31 |
| SPL-M264 | 264 | 0.056 | 56 | 0.04 | 34 |
| SPL-M300 | 300 | 0.052 | 52 | 0.032 | 37 |
| SPL-M363 | 363 | 0.04 | 40 | 0.03 | 32 |
Manual Cleaning and Reuse
These elements are manually removed and cleaned; they do not provide automatic backwashing. For SPL, switch flow to the standby chamber, then isolate and depressurize the dirty chamber. For DPL, stop and depressurize the system before removal.
- Remove the discs and soak them in a fluid compatible with the oil, mesh and frame: clean diesel, kerosene or an appropriate low-foam cleaner.
- Gently brush along the mesh with a soft brush.
- Use controlled compressed air in the reverse flow direction to clear contamination without deforming the mesh.
- Dry and inspect the mesh, supports and frames before reassembly. Replace damaged discs.
Follow the cleaning-fluid handling instructions and equipment maintenance procedure. Avoid strong-alkali soaking and prolonged ultrasonic treatment for these assemblies, particularly with aluminum frames or delicate mesh layers.
SPL / DPL Oil Filter Element FAQ
What is the difference between SPL and DPL?
SPL is the duplex housing arrangement with a changeover valve; DPL is the simplex arrangement. Both use mesh-disc elements.
Does 0.15 MPa establish the element pressure-drop capacity?
No. It is the cleaning trigger, not an element collapse-pressure rating or an allowable continuous high differential pressure.
Are these elements made from sintered mesh?
No. Standard discs use four woven wire mesh layers and one perforated support plate secured by a frame.
Does mesh count establish an absolute filter rating?
No. Opening size depends on wire diameter and weave; a nominal rating does not establish an ISO 16889 beta ratio.
Can you manufacture replacement discs from a drawing or sample?
Yes. Provide the existing model, dimensions, materials and nominal rating, or send a sample for assessment.
Discuss Your SPL / DPL Filter Requirements
Custom development
For a new project, provide oil type, viscosity, flow, temperature, system pressure, target nominal rating, housing arrangement and installation space.
Made to drawing
For replacements, provide drawings with disc outside and inside diameters, stack height, disc count, materials, tolerances and mating parts.
Made from a sample
If drawings are unavailable, send an existing disc or element for dimensional and structural assessment. Photos and the SPL / DPL model help identify the replacement requirement.
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