Suction Strainer
Suction strainers, or sump-type hydraulic filters, represent the “first-line” low pressure filtration in hydraulic system. The strainer filters take care of the pump, ensuring a safe and efficient operation. They are the only common hydraulic filter element that can be cleaned and reused. The hydraulic strainers are optimal parts for your pump. They are fitted in the hydraulic reservoir’s pump outlet port.
Reference to wikipedia’s Suction filtration https://en.wikipedia.org/wiki/Suction_filtration, The function and working principle is mostly the same. Here are the lists:
1. Do initial cleaning to protect the downstream hydraulic-pump and systems components, also protects the pump from ingesting any start-up debris left in the hydraulic tank and piping.
2. Avoid the ingress of contamination into the hydraulic return line circuit. Extend pump life.
3. Used temporarily to remove debris during testing and commissioning. Reduce breakdown for continous equipment operation,thus extending servicelife-intervals, Reducing unplanned downtime and maintenance.The advantages of using strainers in industry equipment is saving expensive fees since there would be no disruption on fluid passage and preservation of expensive pipes equipment.
4. Be used to filter all mineral, petroleum based fluids, accidental ingression such as large damaging contamination particles that can cause catastrophic failure. Also known as a safety filter.
5. Prolong the lifetime of finer downstream filtration.The strainer cleanliness level required by the system must be ensured by the filters having that function (filler-breather, return-line or Pressure fiIters).
Requirment
However, these advantages are offset by the restriction of the suction strainer in the intake pipe and the negative effect on the life of the pump. Almost all hydraulic pumps are very sensitive to the restriction of pump inlet. Any blockage in the suction line can cause cavitation and mechanical damage. Therefore, strainer filters are mostly suction screen filters (coarse mesh filters or even magnetic separators), usually 50-150 microns in size, with The port sizes avaiable range from 1/2″ BSP to 3″ BSP with flow rates between 15 L/min to 550 L/min, and the filter accuracy is generally 80-200μm,high-efficiency suction strainer filters are not placed on the suction side.
When liquid flows through a filter strainer, the strainer screen will impede the flow and therefore the pressure of the liquid exiting the strainer filter will be lower than prior to entering the strainer. This is referred to as the “pressure drop” of the strainer filter.
The based requirment for the strainer filter is:
Dependable filtering effect
Large filtering volume and filter area
Insignificant low pressure-drop in clean condition
Insignificant rise in pressure loss while dirty
Lengthened service intervals
Easy and time saving cleaning operation
Reasonable price.Can be cleaned and reused after various procedures
Our Features
Flow Rate | Suction strainers filters are available from a flow rate of 15 L/min to 550 L/min |
Nominal Particle Rating | Available from 10 microns to 150 microns filtration rating |
Filter Media | Stainless steel, wire mesh and perforated steel core. |
Sealant | Epoxy based |
Sizes | Same as original, Or custom Build sizes are offered |
Operating Conditions | Filter can withstand temperature up to 120°C. Filter is washable (can be cleaned by applying air pressure) and re used. |
·Operating pressure ·Static pressure testing ·Collapse resistance
| up to 4 bar / 58 psi up to 6 bar / 87 psi up to 5 bar / 73 bar |
Applications:
※ Petroleum-based hydraulic fluids
※ Phosphate esters
※ Water glycols
※ Coolants
※ Lubricating oils
※ Fuels and water in fluid reservoirs
※ Sumps and similar applications
※ Automobile
※ Molding and allied engineering industries
Media
In strainers, the pleated cover is made of copper and aluminum, which are famous for their corrosion resistance. The filter medium is wire mesh. Since mesh filters deal mainly with liquids, they will be used to capture very large, harsh particles that can damage normal filters. This medium can also be used as a corse filter in viscous fluid applications.
The screen medium is composed of stainless steel woven screen, copper screen and epoxy coated screen. It has a single / multi-layer fold structure. The strain free steel can withstand high temperature and corrosive medium, and is supported on the porous plate below by smooth or folded wire mesh. Due to the limitation of wire size and structure, it can’t filter out very fine particles and can only be used for surface cleaning. The main advantages of wire mesh filters are that they last longer than other types of filters because they can be cleaned and reused; have high resistance; and are compatible with heavily contaminated oils. They are commonly used with hydraulic oil, coolants, and lubricants.
It is available in 3 mesh sizes:
◆ Micron Steel Wire Mesh yields 44 µm filtration
◆ 100 mesh yields 150 µm filtration
◆ 200 mesh yields 74 µm filtration
◆ 325 mesh yields 44 µm filtration
MF Series
The hydraulic suction strainer filters are crafted from profiled stainless steel mesh. They are perfectly suited for preserving impurities even when water is present and condensations and oil vapors, but not for preserving impalpable and fine dust, which is suitable for all kinds of mineral oil, gasoline, diesel oil, water, wine, etc. The product can also be used as an air filter to effectively filter the particles in the dust removal air.The feature is:
The highest working oil temperature is 100°C.
Flow range: 12L / min to 1000L / min,
Filtration accuracy: 100 / 120 / 150 ESH (standard)
For exact item and information is:
MF NO. | OD*H | Gasekt |
MF02 MF-02 | Φ55*85 | 1/4″ |
Mf03 MF-03 | Φ55*90 | 3/8″ |
Mf04 MF-04 | Φ66*90 | 1/2″ |
Mf06 MF-06 | Φ66*132 | 3/4″ |
Mf08 MF-08 | Φ66*152 | 1″ |
Mf10 MF-10 | Φ66*176 | 1-1/4″ |
Mf12 MF-12 | Φ82*196 | 1-1/2″ |
Mf12 MF-12 | Φ103*185 | 1-1/2″ |
Mf12 MF-12 | Φ115*230 | 1-1/2″ |
Mf16 MF-16 | Φ103*197 | 2″ |
Mf16 MF-16 | Φ103*230 | 2″ |
Mf16 MF-16 | Φ115*230 | 2″ |
MF20 MF-20 | Φ115*235 | 2-1/2″ |
MF20 MF-20 | Φ135*230 | 2-1/2″ |
MF20 MF-20 | Φ145*250 | 2-1/2″ |
MF24 MF-24 | Φ135*252 | 3″ |
MF24 MF-24 | Φ145*250 | 3″ |
MF24 MF-24 | Φ158*270 | 3″ |
MF24 MF-24 | Φ158*320 | 3″ |
Mf32 MF-32 | Φ158*420 | 4″ |
Mf32 MF-32 | Φ204*320 | 4″ |
FAQ
Stainless steel filter mesh is used in all kinds of auto filters, chemical, rubber and plastic products and many hydraulic equipment. Strainer is only used to clean large damaging contamination particles for first-line corse filtrations. What’s more, stainless mesh can be rinsed and reused, and is washable for years of use.
Are there ever times that unfiltered fluid should be allowed to pass through the pump? The answer is yes, especially if a system requires cold-weather startup.
Startup is a temporary event, and as long as you set the bypass in cold weather, there should be no harm to the pump. Another option for cold weather startup is to oversize the strainer, which offers more surface area for filtration. Most suction strainers are available either with or without a bypass option. Some modifications may also be made when using more viscous fluids.
- To avoid significant pressure drops across the suction filter and there by risking cavitation.
b.Hydraulic pumps are not usually as sensitive to dirt as other components further down the system
Use a suction filter and change it periodically. Oil contains air something like 7% cavitation is where the air in the oil is stretched in a suction vacuum and the bubbles implode on the outlet pressure side damaging the pump, the process is very complex. Reducing the suction vaccum or keeping it clean by servicing will reduce the likelihood of cavitation occurring.
Because of the metal material, strainers can reused after cleaning.It can be used again for 4-5 times.You can clean after 250 hours working for the equipment.Change new strainers after 800-1000 hours.But if the environment is bad, you should shorten the time.
Liquid oil and oil vapors are introduced by compressor lubricants and by hydrocarbon vapors present in ambient air.While a dirty system can usually function adequately, it does so at the expense of downstream components.Liquid water and contaminants can damage the inside of pipes and other pneumatic components.Also, many pneumatic valves and cylinders contain small orifices that can easily get plugged with contamination.
Matching the level of stainless steel filter used in the system to the quality of air required is the most cost effective and energy efficient option.2 micron stainless steel filter is ok for filtering oil vapors.