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What are your prices?

Our prices are subject to change depending on supply and other market factors. We will send you an updated price list after your company contact us for further information.

Do you have a minimum order quantity?

Yes, we require all international orders to have an ongoing minimum order quantity. If you are looking to resell but in much smaller quantities, we recommend you check out our website

Can you supply the relevant documentation?

Yes, we can provide most documentation including Certificates of Analysis / Conformance; Insurance; Origin, and other export documents where required.

Payment and Delivery
What is the average lead time?

For samples, the lead time is about 7 days. For mass production, the lead time is 20-30 days after receiving the deposit payment. The lead times become effective when (1) we have received your deposit, and (2) we have your final approval for your products. If our lead times do not work with your deadline, please go over your requirements with your sale. In all cases we will try to accommodate your needs. In most cases we are able to do so.

What kinds of payment methods do you accept?

You can make the payment to our bank account, Western Union or PayPal:
30% deposit in advance, 70% balance against the copy of B/L.

After-sales Service
What is the product warranty?

We warranty our materials and workmanship. Our commitment is to your satisfaction with our products. In warranty or not, it is the culture of our company to address and resolve all customer issues to everyone’s satisfaction

How about the shipping fees?

The shipping cost depends on the way you choose to get the goods. Express is normally the most quickest but also most expensive way. By seafreight is the best solution for big amounts. Exactly freight rates we can only give you if we know the details of amount, weight and way. Please contact us for further information.

What is your terms of packing?

Generally, we pack our goods in neutral white boxes and brown cartons. If you have legally registered patent, we can pack the goods in your branded boxes after getting your authorization letters.

What is your terms of delivery?


Customized Service
Can you produce according to the samples ?

Yes, we can produce by your samples or technical drawings. We can build the molds and fixtures.OEM or ODM is support

What is your sample policy?

We can supply the sample if we have ready parts in stock, but the customers have to pay the sample cost and the courier cost.

Do you guarantee safe and secure delivery of products?

Yes, we always use high quality export packaging. We also use specialized hazard packing for dangerous goods and validated cold storage shippers for temperature sensitive items. Specialist packaging and non-standard packing requirements may incur an additional charge.

What Causes Over-pressurization?

(1)Over-Pressurized Filters: From time to time, a used oil filter will appear bulged or deformed. A bulged oil filter is one that has been subjected to too much pressure – a condition that occurs when the oil pressure regulating valve is malfunctioning. When a bulged oil filter is discovered, the pressure regulating valve should be serviced immediately.

(2)What causes over-pressurization? Excessive engine oil pressure is the result of a faulty oil pressure regulating valve. To properly separate the engine parts and prevent excessive wear, the oil must be under pressure. The pump supplies oil at volumes and pressures greater than what the system requires to lubricate the bearings and other moving parts. The regulating valve opens to allow excess volume and pressure to be diverted.

(3)There are two ways that the valve fails to operate correctly: either it sticks in the closed position, or it is slow to move to the open position after the engine has started. Unfortunately, a stuck valve can free itself after filter failure, leaving no evidence of any malfunction.

(4)Note: Excessive oil pressure will cause filter deformation. If the regulating valve still remains stuck, the gasket between the filter and the base can blow out or the filter seam will open. The system will then lose all of its oil. To minimize the risk of an over-pressurized system, motorists should be advised to change the oil and filter often.


What Valves Are In Oil Systems And Are They In The Oil Filter?

(1)Oil Pressure Regulating Valve: The oil pump pressure regulating valve, usually built into the oil pump, helps control the operating pressure of the lubrication system. The regulating valve is set by the manufacturer to maintain the correct pressure. The valve utilizes a ball (or plunger) and spring mechanism. When the operating pressure is below the preset PSI level, the spring holds the ball in the closed position so oil flows to the bearings under pressure. When the desired amount of pressure is reached, the valve opens enough to maintain this pressure. Once the valve is open, the pressure remains fairly constant, with only small changes as the engine speed varies. If the oil pressure regulating valve becomes stuck in the closed position or is slow to move to the open position after the engine has started, the pressure in the system will exceed the regulating valve setting. This may cause an over-pressurized oil filter. If a deformed oil filter is observed, the oil pressure regulating valve must be serviced immediately.

(2)Relief (Bypass) Valve: In a full-flow system, all of the oil passes through the filter to reach the engine. If the filter clogs, an alternative route to the engine must be provided for the oil, or the bearings and other internal parts may fail due to oil starvation. A relief, or bypass, valve is used to allow unfiltered oil to lubricate the engine. Unfiltered oil is far better than no oil at all. This relief (bypass) valve is built into the engine block in some cars. Otherwise, the relief (bypass) valve is a component of the oil filter itself. Under normal conditions, the valve remains closed. When there is sufficient contaminant in the oil filter to reach a preset level of pressure differential to oil flow (around 10-12 PSI in most passenger cars), pressure differential on the relief (bypass) valve causes it to open. This condition can occur when the oil filter has become clogged or when the weather is cold and the oil is thick and flows slowly.

(3)Anti-Drainback Valve: Some oil filter mountings may allow oil to drain out of the filter through the oil pump when the engine is stopped. When the engine is next started, oil must refill the filter before full oil pressure reaches the engine. The anti-drainback valve, included in the filter when required, prevents oil from draining out of the filter. This anti-drainback valve is actually a rubber flap that covers the inside of the inlet holes of the filter. When the oil pump starts pumping oil, the pressure will unseat the flap. The purpose of this valve is to keep the oil filter filled at all times, so when the engine is started there will be an almost instantaneous supply of oil to the engine.

(4)Anti-Siphon Valve: When a turbocharged engine is turned off, it is possible for the turbocharger’s lubrication circuit to siphon oil from the oil filter. To prevent this from happening, the turbocharged engine’s oil filter is equipped with a specially designed, one-way, shut-off called the anti-siphon valve. Oil pressure keeps this spring-loaded valve open while the engine is turned on. When the engine is turned off and oil pressure drops to zero, the anti-siphon valve automatically closes to prevent the back-flow of oil. This valve ensures that there will be a continuous supply of oil available to the turbocharger and the engine’s lubrication system upon startup.

(5)Notes on dry starts: If a vehicle has not been operated for several days or after the oil and filter are changed, some oil may have drained from the filter in spite of the special valves. This is why it is always a good idea to start the engine slowly, letting it run on idle for 30-60 seconds, so the lubrication system will be fully charged with oil before a heavy load is placed on the engine.

How Are Filters Tested?

(1)Filter Engineering Measurements. Measuring efficiency must be based on the premise that the filter is present on the engine to remove harmful particles and thus protect the engine from wear. Filter efficiency is the measurement of the filter’s performance in preventing harmful particles from reaching the wearing surfaces of the engine. The most widely used methods of measurement are single pass efficiency, cumulative efficiency and multipass efficiency. The standards that specify how these tests are performed are written by world-wide engineering bodies: SAE (Society of Automotive Engineers), ISO (International Standards Organization) and NFPA (National Fluid Power Association). The standards to which Benzhilv filters are tested are the automotive industry’s accepted methods for evaluating and comparing filter performance. Each of these methods interprets efficiency from a different point of view. A brief explanation of each follows.

(2)Filter Capacity is measured in a test specified in SAE HS806. To create a successful filter, a balance must be found between high efficiency and long life. Neither a long-life filter with low efficiency nor a high-efficiency filter with short life is useful in the field. The contaminant-holding capacity as defined in SAE HS806 is the amount of contaminant removed and held by a filter from the oil during a constantly recirculating flow of contaminated oil. The test is terminated when a predetermined pressure drop across the filter is reached, typically at 8 psid. This pressure drop is associated with the setting of a filter bypass valve.

(3)Cumulative Efficiency is measured during the filter capacity test conducted to SAE standard HS806. The test is run by continuously adding test contaminant (dust) to the oil circulating through the filter. Efficiency is measured by comparing the weight of the contaminant left in the oil after the filter, to the known amount that has been added to the oil up to the time of analysis. This is a cumulative efficiency because the filter has many chances to remove the dirt from the oil as it is circulated repeatedly through the filter.

(4)Multipass Efficiency. This procedure is the most recently developed of the three and is carried as a recommended procedure by both international and U.S. standards organizations. It involves a newer test technology in that automatic particle counters are used for analysis instead of simply weighing the dirt. The advantage of this is that the particle removal performance of the filter can be found for different size particles throughout the filter’s life. The efficiency determined in this test method is an “instantaneous” efficiency, because the number of particles before and after the filter are counted at the same instant. These numbers are then compared to generate an efficiency measurement.

(5)Mechanical and Durability tests. Oil filters are also subjected to numerous tests to assure the integrity of the filter and its components during vehicle operating conditions. These tests include burst pressure, impulse fatigue, vibration, relief valve and anti-drainback valve operation and hot oil durability.

(6)Single Pass Efficiency is measured in a test specified by SAE HS806. In this test the filter gets only one chance to remove the contaminant from the oil. Any particles passed through the filter are trapped by an “absolute” filter for weighing analysis. This weight is compared to the amount originally added to the oil. This calculation determines the efficiency of the filter in removing particles of a known size, the size that caused the significant engine wear, 10 to 20 microns. The name single pass refers to the fact that the particles go through the filter only once instead of many times.


Do you test all your goods before delivery?

Yes, we have 100% test before delivery

Fuel Filter Replacement Steps

(1) Release the pressure in the combustion filter system to ensure that the oil does not spray out during the disassembly process.

(2)Remove the old fuel filter from the base. and clean the base mounting surface.

(3)Fill the new fuel filter with fuel.

(4)Apply some oil on the surface of the new fuel filter sealing ring to ensure the sealing

(5)Install new fuel filter on base. After the sealing ring is installed on the base, tighten it by 3/4~1 turn

Tips for Using Diesel Filters and Understanding the Importance of Fuel Filters

Misunderstanding 1: It doesn’t matter what filter you use, as long as it doesn’t affect the current operation.
Sticking to Mud: The effect of a poor quality filter on the engine is hidden and may not be noticed right away, but by the time the damage builds up to a certain point, it will be too late.

Misunderstanding 2: The quality of the combustion filter is similar, and frequent replacement is no problem
Reminder: The measure of filter quality is not only the life of the filter, but also the filtration efficiency of the filter. If a filter with low filtration efficiency is used, even if it is changed frequently, the common rail cannot be effectively protected. system.

Myth 3: Filters that don’t need to be changed often are definitely the best filters
Hint: under the same conditions. High-quality filters will be replaced more frequently because they are more effective at removing impurities.

Myth 4: Filter maintenance only needs regular replacement at the service station
Reminder: Since diesel oil contains water, remember to drain the filter regularly during use while doing regular filter maintenance.

Technical Description

The purpose of a fuel filter is to clean the fuel in your vehicle, removing contaminants and protecting your fuel injectors. A clean fuel filter will allow a constant flow of fuel to your engine that ignites properly. If your fuel filter becomes clogged with dirt or grime, the fuel may be unable to correctly ignite, causing reduced power in your engine.

A blocked fuel filter can also lead to less fuel entering the fuel injection system, and therefore a lean air fuel mixture. This can cause your engine to misfire, which reduces engine power and increases harmful green house gas exhaust emissions. It can also cause your engine to run hotter then normal which is not desirable.

Having a clean fuel filter will improve the lifespan of your fuel injectors, allowing for better overall power and fuel efficiency. New Fuel Filter will allow for an improved flow of fuel and improved vehicle engine performance.


The installation method of hydraulic filter element and the correct use of hydraulic oil filter element

1. Before replacing the hydraulic oil filter element, drain the original hydraulic oil in the box, check the oil return filter element, the oil suction filter element and the pilot filter element for three types of hydraulic oil filter elements to see if there are iron filings, copper filings or other impurities. The wave pressure element where the oil pressure filter element is located is faulty. After the overhaul is eliminated, clean the system.

2. When replacing hydraulic oil, all hydraulic oil filter elements (oil return filter element, oil suction filter element, pilot filter element) must be replaced at the same time, otherwise it is equivalent to not changing.

3. Identify the hydraulic oil label. Do not mix hydraulic oils of different labels and brands, which may cause the hydraulic oil filter element to react and deteriorate and produce purple-like substances.

4. Before refueling, the hydraulic oil filter element (oil suction filter element) must be installed first. The nozzle of the hydraulic oil filter element directly leads to the main pump. The entry of impurities will accelerate the wear of the main pump, and the pump will be hit.

5. After adding oil, pay attention to the main pump to exhaust air, otherwise the whole vehicle will not move temporarily, the main pump will make abnormal noise (air noise), and the cavitation will damage the hydraulic oil pump. The air exhaust method is to directly loosen the pipe joint on the top of the main pump and fill it up directly.

6. Regularly do oil testing. The wave pressure filter element is a consumable item, and it needs to be replaced immediately after it is usually blocked.

7. Pay attention to flushing the system fuel tank and pipeline, and pass the fueling device with filter when refueling.

8. Do not let the oil in the fuel tank come into direct contact with the air, and do not mix old and new oil, which is helpful to prolong the service life of the filter element.

For the maintenance of the hydraulic filter element, it is an essential step to perform regular cleaning work. In addition, if it is used for a long time, the cleanliness of the filter paper will be reduced. According to the situation, the filter paper should be replaced regularly and appropriately to achieve better Filtering effect, and then if the model equipment is running, do not replace the filter element.

Filter Requirements

There are many types of filters, and the basic requirements for them are: for general hydraulic systems, when selecting filters, the particle size of impurities in the oil should be considered to be smaller than the gap size of hydraulic components; for follow-up hydraulic systems, the filter should be selected. High precision filter. The general requirements for filters are as follows:

1) There is enough filtration accuracy, that is, it can block impurity particles of a certain size.

2) Good oil-passing performance. That is, when the oil passes through, in the case of a certain pressure drop, the amount of oil passing through the unit filtration area should be large, and the filter screen installed at the oil suction port of the hydraulic pump should generally have a filtration capacity of more than 2 times the capacity of the hydraulic pump.

3) The filter material should have a certain mechanical strength to prevent damage due to oil pressure.

4) At a certain temperature, it should have good corrosion resistance and sufficient life.

5) Easy to clean and maintain, and easy to replace the filter material.


Functions Of The Hydraulic Filter

After the impurities in the hydraulic system are mixed into the hydraulic oil, with the circulation of the hydraulic oil, it will play a destructive role everywhere, seriously affecting the normal operation of the hydraulic system, such as making a small gap between the relatively moving parts in the hydraulic components (measured in μm ) and the throttling holes and gaps are stuck or blocked; destroy the oil film between the relatively moving parts, scratch the surface of the gap, increase the internal leakage, reduce the efficiency, increase the heat, aggravate the chemical action of the oil, and make the oil deteriorate. According to production statistics, more than 75% of the failures in the hydraulic system are caused by impurities mixed in the hydraulic oil. Therefore, it is very important for the hydraulic system to maintain the cleanliness of the oil and prevent the pollution of the oil.

The three main functions of the hydraulic filter in the hydraulic system

A. Impurities generated during the working process, such as the debris formed by the hydraulic action of the seal, the metal powder produced by the relative wear of the movement, the colloid, asphaltene, and carbon residue produced by the oxidative deterioration of the oil.

B. Mechanical impurities still remaining in the hydraulic system after cleaning, such as rust, casting sand, welding slag, iron filings, paint, paint skin and cotton yarn scraps;

C. Impurities entering the hydraulic system from the outside, such as dust entering through the fuel filler port and dust ring;

Hydraulic filter tips

There are many ways to collect pollutants in fluids. Devices made of filter materials to capture pollutants are called filters. Magnetic filters that use magnetic materials to adsorb magnetic pollutants are called magnetic filters. In addition, there are electrostatic filters, separation filters and so on. In the hydraulic system, any collection of pollutant particles in the fluid is collectively referred to as a hydraulic filter. In addition to the method of using porous materials or wound fine gaps to intercept pollutants, the most widely used hydraulic filters are magnetic filters and electrostatic filters used in hydraulic systems. Function: The function of the hydraulic filter is to filter various impurities in the hydraulic system.

Where Hydraulic Filter Used For

Hydraulic filters are used anywhere in a hydraulic system particle contamination is to be removed. Particle contamination can be ingested through the reservoir, created during the manufacture of system components, or generated internally from the hydraulic components themselves (especially pumps and motors). Particle contamination is the primary cause of hydraulic component failure.

Hydraulic filters are used in three key locations of a hydraulic system, depending on the required degree of fluid cleanliness. Nearly every hydraulic system has a return line filter, which traps particles ingested or generated our in the hydraulic circuit. The return line filter traps particles as they enter the reservoir, providing clean fluid for reintroduction into the system.

The working principle of hydraulic oil suction filter

The water enters the filter from the water inlet. The automatic filter first filters out the larger particles of impurities through the coarse filter element assembly, and then reaches the fine filter screen. After filtering out the fine particles of impurities through the fine filter screen, the clean water is discharged from the water outlet. During the filtration process, the impurities in the inner layer of the fine filter gradually accumulate, and a pressure difference is formed between the inner and outer sides of the self-cleaning pipeline filter.

The water to be treated by the hydraulic oil suction filter enters the body from the water inlet, and the impurities in the water are deposited on the stainless steel filter screen, resulting in a pressure difference. The pressure difference between the inlet and outlet is monitored by the differential pressure switch. When the pressure difference reaches the set value, the electric controller sends a signal to the hydraulic control valve and drives the motor, which triggers the following actions: the motor drives the brush to rotate, cleans the filter element, and opens the control valve at the same time. For sewage discharge, the entire cleaning process only lasts for tens of seconds. When the cleaning of the self-cleaning pipeline filter is completed, the control valve is closed, the motor stops rotating, the system returns to its initial state, and the next filtration process begins.


The oil filter element is the oil filter. The function of the oil filter is to filter out the sundries, gums and moisture in the oil, and deliver clean oil to each lubricating part.

In order to reduce the frictional resistance between the relatively moving parts in the engine and reduce the wear of the parts, the oil is continuously transported to the friction surface of each moving part to form a lubricating oil film for lubrication. The engine oil itself contains a certain amount of gum, impurities, moisture and additives. At the same time, during the working process of the engine, the introduction of metal wear debris, the entry of debris in the air, and the generation of oil oxides make the debris in the oil gradually increase. If the oil directly enters the lubricating oil circuit without being filtered, the sundries contained in the oil will be brought into the friction surface of the moving pair, which will accelerate the wear of parts and reduce the service life of the engine.

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