Festo MS4-LFR-1/4-D6-E-P-M-A8-B Filter Regulator

MS4-LFR-1/4-D6-E-P-M-A8-B: MS4 filter regulator with 40 µm filtration

The Festo MS4-LFR-1/4-D6-E-P-M-A8-B (article 8098255) is a compressed-air filter regulator of the MS series, size 4, with G1/4 ports. It cleans the air, drains condensate and holds a set outlet pressure in a single housing. Seven Star LLC supplies MS4-LFR-1/4-D6-E-P-M-A8-B in Oman and the GCC as an independent supplier in Muscat, not affiliated with the manufacturer. The notes below turn the manufacturer data sheet into practical selection advice.

How to read the part number against the datasheet:

• MS4 is the series and size shown on the datasheet (series MS, size 4).
• LFR stands for filter regulator, meaning the filter and the pressure regulator share one housing.
• 1/4 in the code matches the G1/4 port thread listed for both ports.
• The remaining letters select options such as regulation range, filter element, drain, gauge and housing. In the datasheets reviewed for this page, codes containing C show a 5 µm element and codes containing E show 40 µm; always confirm the actual values against the sheet for article 8098255.
• This version: filter grade 40 µm, condensate drain manual, rotating, no gauge is fitted and the gauge port is prepared for G1/8.

MS4-LFR-1/4-D6-E-P-M-A8-B technical specifications

Values in the table are taken from the manufacturer data sheet for article 8098255.

How the MS4-LFR-1/4-D6-E-P-M-A8-B filters and regulates compressed air

Incoming air is made to swirl inside the filter section, so water droplets and coarse particles are thrown to the wall and fall into the bowl, while the 40 µm element holds back finer solids. The datasheet states a degree of condensate separation of 75 %. The collected condensate leaves through the manual, rotating drain.

Downstream, a regulator holds the outlet pressure steady at the set value inside the range 0.3 bar to 7 bar. The datasheet lists the controller function as: output pressure constant; with secondary exhausting; with return flow function. A maximum pressure hysteresis of 0.5 bar describes how far the outlet can differ between rising and falling adjustment, so set pressure by approaching the target from below.

The nominal flow of 1700 l/min is the standardised value. Under higher demand the outlet pressure sags, which matters for fast cylinders and blow-off. The air purity class at the output is Compressed air to ISO 8573-1:2010 [7:4:4], with the unit weighing 204 g in a reinforced pa housing and Makrolon® bowl.

Where MS4-LFR-1/4-D6-E-P-M-A8-B fits: compatible and related parts

The MS modular air-preparation range lets a filter regulator stand alone at a machine inlet or be combined with shut-off valves, soft-start valves, lubricators and distribution blocks from the same series. Mounting options listed on the sheet: front panel mounting; inline installation; with accessories.

Related units we handle in the same series include MS4-LFR-1/4-D6-E-P-M-AG-BAR-B, MS4-LFR-1/4-D6-C-P-VC-A8-B, MS4-LFR-1/4-D6-E-R-M-MPA, MS4-LFR-1/4-D7-CRV-AS-Z, MS4-LFR-1/8-D7-C-R-M-PAGN-AS-WR, MS6-LFR-1/2-D6-C-R-V-A4-AS. They differ in filter element, drain, ports, regulation range and housing, so a replacement must match all of these rather than just the family name.

Selection and ordering checklist for MS4-LFR-1/4-D6-E-P-M-A8-B

• Filter grade 40 µm: use the coarse 40 µm element only when the downstream equipment tolerates it.
• Condensate drain: manual, rotating, with a bowl capacity of 16.5 ml.
• Pressure: operating 1 bar to 10 bar and regulation 0.3 bar to 7 bar; confirm both against the machine.
• Flow: 1700 l/min nominal, to be compared with peak consumption of the branch.
• Thread: G1/4 on both ports, so check G against NPT before ordering.
• The gauge port is prepared for G1/8 but nothing is fitted, so list the gauge, plug or sensor you want in the same enquiry. Because the housing is reinforced polyamide, avoid locations where solvents or hot surfaces can reach the body.

Installation, commissioning and maintenance of MS4-LFR-1/4-D6-E-P-M-A8-B

Install the unit upright (Vertical ±5°) with the bowl downwards and the flow arrow matching the air direction, close to the equipment it protects and downstream of the main air treatment. Leave room beneath the bowl to reach the drain.

At start-up open the supply slowly, then raise the outlet pressure from below to the target. The datasheet lists the actuator lock as: rotary knob with detent. Check the bowl periodically for oil or water, replace the element on a schedule or when pressure drop grows, and keep spare seals and elements for planned stops.

Typical applications of MS4-LFR-1/4-D6-E-P-M-A8-B in Oman and the GCC

Oman and the wider GCC put pneumatic and sensing equipment under demanding conditions: summer ambient heat, fine desert dust, high humidity in coastal plants and compressed-air systems that are not always perfectly dried. A size-4 unit without a fitted gauge suits small machine inlets where the operator never needs a local reading, or where the G1/8 gauge port is used for a pressure sensor or a switch instead. At 1700 l/min it comfortably feeds a bank of small valves and cylinders on a packaging or assembly cell.

The datasheet lists a corrosion resistance class of 1 – Low corrosion stress and media and ambient temperature of -5 °C to 50 °C. In coastal plants with salt-laden air or dusty inland sites, this should be weighed against the housing material, reinforced pa, when choosing the mounting location.

MS4-LFR-1/4-D6-E-P-M-A8-B compared with related filter regulators

Key data from the manufacturer sheets of this unit and its closest siblings.

Information to send with your MS4-LFR-1/4-D6-E-P-M-A8-B RFQ

• Full part number MS4-LFR-1/4-D6-E-P-M-A8-B and the quantity required.
• Pipe thread standard (G or NPT) and size on your system.
• Supply pressure range, required outlet pressure and peak flow.
• Whether you need a gauge, mounting bracket or other MS-series accessories.
• Air quality at the site (dryness, oil carry-over, dust).
• Delivery location in Oman or the GCC.

Documents and quotation

The manufacturer data sheet for MS4-LFR-1/4-D6-E-P-M-A8-B is attached on this page for download.

Send the part number MS4-LFR-1/4-D6-E-P-M-A8-B with quantity and delivery location and we will confirm availability and a quotation. Seven Star LLC is an independent supplier and is not affiliated with the manufacturer.