Sintered Filter Plate

NAVI Titanium's sintered filter plate have uniform pore size, high strength, and are resistant to high temperatures and corrosion. They are widely used for precision separation and purification of industrial fluids (liquids/gases). NAVI Titanium handles the entire process in-house, from powder mixing, mold development, pressing, and vacuum sintering to precision machining and edge finishing. Their sales team provides one-on-one service to fully address customer needs.

 

NAVI Titanium sintered filter plates can be customized into square, rectangular, rounded-corner, or perforated plates with mounting holes. It's made by high-temperature sintering of powder, with controllable pore size and porosity, providing even airflow, high strength, and resistance to acid and alkali corrosion. It's easy to clean and reuse, and is widely used in electrochemistry, fluid filtration, gas diffusion, and as an air-permeable electrode plate in electrolyzers.

Sintered Filter Plate is a rigid integrated porous functional component made of bronze, 304/316L stainless steel, titanium alloy metal powder, or multi-layer metal wire mesh as the substrate, through compression molding and high-temperature vacuum solid-phase sintering. Internally, a three-dimensional connected and controllable microporous network is formed, which is different from tubular sintered filters, ordinary woven filters, and punched plates. It has unique advantages such as planar rigid structure, compressive difference, pore deformation resistance, and can be integrated and installed inside valve blocks, oil tanks, pump bodies, and gas source processing units. In hydraulic transmission, circulating lubrication, fuel supply, and pneumatic control systems, sintered plate simultaneously undertake five major functions: precision particle interception, fluid homogenization and pressure stabilization, airflow noise reduction, component built-in protection, and fire and explosion prevention. Traditional paper filter materials and woven metal mesh commonly suffer from shortcomings such as pore expansion under high pressure, fiber shedding, non renewability, and limited installation forms; The sintered plate relies on a metallurgical integrated framework to adapt to harsh working conditions such as high and low temperatures, pressure fluctuations, continuous oil and liquid impacts, and combustible media.

Pre protection filter plate for hydraulic pump suction port (coarse protection)

 

The sintered plate produced by NAVI Titanium is installed inside the fuel tank and on the end face of the oil pump suction flange, serving as the core filter material for the suction filter. The main purpose is to intercept larger impurities (welding slag, rubber fragments, mud and sand) in the fuel tank, prevent hard large particles from directly entering the hydraulic pump chamber, and avoid large-scale scratches on gears, blades, and distribution plates. Generally, bronze sintered plate and large-diameter stainless steel sintered plate are the most commonly used, with an accuracy of generally 20-60 μ m.

The oil pump starts to generate negative pressure to extract oil, and the sintered plate has a uniform porous structure to ensure sufficient flow capacity and avoid cavitation caused by high oil absorption resistance; Compared to metal filters, sintered plate have stronger rigidity, will not collapse under negative pressure, and will not corrode when immersed in hydraulic oil for a long time. It belongs to the first barrier, protecting the main pump from catastrophic damage, and is commonly used in hydraulic systems of construction machinery, hydraulic stations of machine tools, and small hydraulic power units.

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Choosing the right material is critical to the filtration performance, service life, and chemical compatibility of a sintered filter plate. NAVI Titanium offers sintered filter plates in titanium, stainless steel, bronze, and nickel-based materials, allowing the filter structure to be matched to the operating medium, temperature, pressure, corrosion conditions, and filtration requirements. The following guide helps engineers and procurement teams select a suitable material based on application conditions rather than material cost alone.

Hydraulic valve block with built in sintered filter plate
Overflow valve, pressure reducing valve, electro-hydraulic directional valve, proportional valve, servo valve pilot control oil circuit. The clearance between the valve core and valve sleeve of servo valves and proportional valves is usually only 1-5 μ m, and extremely small particles can cause valve core jamming, zero drift, and control failure. Before the pilot oil enters the valve core, a 5-10 μ m sintered stainless steel filter plate is used for terminal security filtration.

The filter plate is directly press installed inside the valve block flow channel, without occupying external space, achieving "built-in filtering of components", which is a standardized design scheme for high-end hydraulic components. In this way, the flow rate is small and the pressure pulsation is frequent, requiring stable pores of the filter material and no medium precipitation; It is not allowed for the filter material to shed tiny particles and cause permanent damage to the servo valve.

Multilayer wire mesh sintered plate are widely used in the field of servo valves due to their uniform aperture and stable dirt absorption.

High pressure oil discharge circuit, flushing circuit filter plate
The oil discharged from the main valve, plunger motor, and variable displacement pump discharge port carries a large amount of metal particles generated by friction, which are intercepted by the sintered plate to prevent pollutants from flowing back to the oil tank and continuously circulating in the pollution system. The flushing valve of the partially closed hydraulic system is integrated with a sintered plate , which continuously purifies the closed circuit oil and controls the pollution level of the system.

The hydraulic oil circuit for accumulator inflation and the control flow channel of the one-way valve are equipped with small circular sintered filters to prevent rust particles from entering the sealing surface of the one-way valve and prevent the one-way valve from not closing tightly and continuously leaking.
The oil level of the hydraulic oil tank rises and falls with the expansion and contraction of the oil cylinder, and air enters and exits the oil tank through the respirator. The sintered plate inside the respirator filters dust from the outside air to prevent atmospheric pollutants from entering the oil; Simultaneously blocking the oil mist from overflowing outward. Bronze sintered plate are widely used in hydraulic air filters, with characteristics of breathability, dust resistance, and oil resistance.

The lubricating oil system includes equipment gearbox circulation lubrication, bearing thin oil lubrication, generator set crankshaft lubrication, and large fan main shaft lubrication. The core function of lubricating oil is to lubricate, cool, and remove friction and wear debris. NAVI Titanium's sintered filter plate mainly undertakes four functions in the lubrication system: isolation and filtration inside the oil tank, protection of the oil pump inlet, local filtration of the oil circuit branch, and separation of oil mist.

 

The inlet of the lubricating oil station oil pump is equipped with a built-in filter plate

A sintered plate is installed on the front flange of the oil pump for large gearboxes and thin oil lubrication stations to intercept metal debris from gear peeling and rust impurities from the casing, protecting the impeller and gears of the lubricating oil pump. The viscosity of lubricating oil is generally higher than that of hydraulic oil. The porosity of the filter plate has been optimized to reduce the resistance of high viscosity fluids passing through and avoid bearing burnout caused by insufficient oil supply.

Branch lubricating oil circuit end security filter plate

Multiple independent bearing lubrication branches are embedded with sintered plate at the end of the pipeline leading to high-speed bearings. Even if the main filter is damaged, the sintered filter sheet still serves as the final barrier to prevent hard particles from entering the high-speed friction pair. Once high-speed bearings enter micron sized particles, they are prone to pitting corrosion and fatigue peeling.

Internal oil separation and settling auxiliary filter plate of gearbox
A sintered filter sheet partition is installed inside the large reducer box, which blocks the settling impurities at the bottom of the box and reduces the continuous suction of impurities by the oil pump; At the same time, it does not hinder the overall circulation and flow of the oil.

Lubricating oil gas separation and oil mist recovery unit filter plate
The operation of the gearbox and bearing housing heats up and generates oil mist. The sintered filter sheet at the ventilation port of the housing achieves air permeability and oil resistance: the gas is discharged to balance the pressure inside the housing, and the lubricating oil mist is trapped by micro holes and flows back to the housing, reducing lubricating oil loss while blocking external dust from entering the housing.
Generator set, internal combustion engine crankcase respirator filter plate
Internal combustion engine crankcase generates blow by gas, and the respirator is equipped with a sintered filter sheet to separate oil mist and filter the externally inhaled air;

Compared to non-woven respirators, metal sintered filter sheet are heat-resistant and can withstand continuous high temperatures in the engine compartment. They are less prone to aging and blockage, and can be cleaned and reused.
Summary of application characteristics of lubrication system
The pollutants in the lubrication system are mainly metal debris, which has high hardness; Part of the operating conditions have a long-term oil temperature of 80-110 ℃. Bronze sintered filter sheet are suitable for conventional cyclic lubrication; Stainless steel sintered filter sheet are preferred for lubricating oil with continuous high temperature and extreme pressure additives to avoid medium corrosion of filter materials.

The fuel system medium includes gasoline, diesel, aviation kerosene, and heavy oil; The system components include fuel tank, fuel transfer pump, high-pressure common rail fuel pump, fuel injector, and fuel pressure regulating valve. The precision parts of the high-pressure fuel injection system have extremely small clearances and are highly sensitive to solid impurities in the fuel. Sintered filter plate are mainly used for four scenarios: coarse filtration inside the fuel tank, inlet protection of the oil pump, filtration inside the pressure regulating valve, and explosion-proof, fire-resistant, and breathable.

 

The fuel tank is equipped with a built-in suction filter plate
The circular sintered filter sheet is installed at the oil suction port of the diesel fuel tank and generator set fuel tank of construction machinery, which belongs to the first filtration of fuel. Intercept large particles of rust, sediment, and gum to protect the impeller of the oil pump. Different from external fuel filters, the sintered filter sheet inside the fuel tank is immersed in fuel for a long time, with a sturdy structure and resistance to fuel impact. Bronze sintered plates are resistant to swelling in diesel and gasoline media and are widely used.

 

High pressure fuel pump, common rail pressure regulating valve with built-in precision filter plate
The pressure of modern diesel common rail systems can reach over 1600 bar, and micro sintered filters (3-10 μ m) are pressure installed inside the high-pressure fuel pump and fuel pressure regulating valve as terminal precision protection. Once the main fuel filter is damaged, tiny hard particles will directly cause wear and jamming of the high-pressure plunger and fuel injector; The built in sintered filter sheet forms a secondary protection, which is an important guarantee for the reliability of the common rail fuel system. Stainless steel sintered filter sheet are commonly used for fuel control valves in aircraft engines.

 

Internal protective filter plates for one-way valves and overflow valves in fuel pipelines
The fuel overflow valve and one-way valve are equipped with sintered filter sheet to prevent impurities from getting stuck on the sealing cone surface, causing unstable fuel pressure, leakage, and difficulty in starting.

 

Breathable flame retardant filter plate for fuel storage tank
The sintered metal filter plate produced by NAVI Titanium in the fuel tank vent has the ability to filter dust in the air; The metal porous structure serves as a flame arrester, blocking external open flames from igniting fuel vapor inside the box, achieving the integration of breathability and explosion prevention. This function is based on the destruction of flame propagation conditions by a large number of small channels in porous metals, and is a standard safety structure for internal combustion engines and mobile fuel equipment.

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