The Festo LR-1/4-D-7-MIDI is a pressure regulator from the Festo D series, Festo part number 186453. It has G1/4 female threads on both ports, regulates the outlet pressure from 0.5 to 7 bar, passes a standard nominal flow of 2200 l/min and weighs 720 g. Operating pressure at the inlet can be anywhere from 0 to 16 bar.
The regulator holds the pressure downstream constant regardless of what happens upstream. If the supply pressure falls, or if a machine downstream suddenly draws more air, the regulator opens or closes to keep the set pressure, with a maximum hysteresis of 0.2 bar. The setting knob has a detent so the setting does not drift with machine vibration, and the housing is die-cast zinc.
This is the standard version without the integrated non-return function. Air flows in one direction only, from port 1 to port 2. If you need the downstream air to be able to flow back and exhaust through the regulator, order the version with I in the type code instead.
The unit is supplied with a pressure gauge fitted, with a bar scale on the outside and psi on the inside, so the set pressure can be read directly at the machine.
The unit is a Midi size, which is a 55 mm grid dimension, so it lines up with the other Festo D series units of the same size and can be built into a service unit combination with connecting plates, mounting brackets, a shut-off valve or a lubricator. Ambient and medium temperature range is -10 to 60 degrees C.
Technical specifications
| Brand | Festo |
|---|---|
| Festo part number | 186453 |
| Type code | LR-1/4-D-7-MIDI |
| Series | Festo LR D series |
| GTIN | 4052568076184 |
| Product type | Pressure regulator, piloted |
| Size | Midi (55 mm grid dimension) |
| Pneumatic connection | G1/4 female thread, both ports |
| Pressure regulation range | 0.5 to 7 bar |
| Operating pressure | 0 to 16 bar |
| Standard nominal flow rate | 2200 l/min |
| Max. pressure hysteresis | 0.2 bar |
| Pressure gauge | With pressure gauge |
| Additional function | None |
| Actuator lock | Rotary knob with detent |
| Mounting position | Vertical, plus or minus 5 degrees |
| Ambient temperature | -10 to 60 degrees C |
| Temperature of medium | -10 to 60 degrees C |
| Operating medium | Compressed air to ISO 8573-1:2010 [7:8:4], also inert gases |
| Corrosion resistance class | CRC 2 |
| Type of mounting | With accessories, mounting bracket or connecting plates |
| Housing material | Die-cast zinc |
| Note on materials | RoHS compliant |
| Product weight | 720 g |
Reading the type code LR-1/4-D-7-MIDI
- LR — pressure regulator (LRS is the lockable version)
- 1/4 — pneumatic connection G1/4 female thread
- D — D series, metal design
- 7 — pressure regulation range 0.5 to 7 bar; without this digit the range is 0.5 to 12 bar
- MIDI — size Midi, 55 mm grid dimension
Dimensions
The official Festo dimension drawing for the LR D series is in the image gallery on this page, with all the reference letters for the Mini, Midi and Maxi bodies. This unit is the Midi size, a 55 mm grid dimension. Ask us for the Festo datasheet of part number 186453 and we will send the complete dimension table.
What the LR-1/4-D-7-MIDI is used for
- Setting and holding the working pressure of a machine, a station or a single actuator
- Reducing pressure on a branch line so cylinders run at the force the application actually needs
- Keeping the pressure constant when several machines share one compressor and the supply fluctuates
- Saving air and reducing wear by running at the lowest pressure that still does the job
- Adding a second pressure zone to an existing machine without touching the main air preparation
- Service unit combinations with the other Festo D series Midi units, because they share the 55 mm grid dimension
Frequently asked questions
What does the type code LR-1/4-D-7-MIDI mean?
Each block of the code is one option, and the list under the specifications on this page breaks this exact code down piece by piece. In short: LR is the series, G1/4 is the thread size, D is the metal D series, MIDI is the body size, and the letters in between set the pressure range, the pressure gauge and the non-return function.
What is the difference between the LR and the LFR?
The LR regulates pressure only. The LFR is the same regulator with a filter and condensate bowl built on, so it also cleans the air. Use the LR where the air is already filtered upstream, and the LFR where it is not. Both share the same body size and grid dimension, so they can be swapped in a service unit.
What is the difference between the 7 bar and the 12 bar version?
The number sets how far the regulator can be turned up. This unit regulates from 0.5 to 7 bar. The 0.5 to 7 bar version gives finer control across the range most machines actually use, and the 0.5 to 12 bar version is for systems that need to run above 7 bar. The inlet can be up to 16 bar in both cases.
Does this unit come with a pressure gauge?
Yes. A pressure gauge is fitted, with bar on the outer scale and psi on the inner scale.
Can I build this into a service unit with a lubricator and a shut-off valve?
Yes. All Festo D series units of the same size share a grid dimension, 55 mm for Midi, so this unit lines up with the LOE lubricator, the HE shut-off valve, the HEE soft-start valve and the branching modules using connecting plates and mounting brackets. Tell us what the combination has to do and we will quote the complete set.
Is this a genuine Festo part?
Yes. RendatSP supplies new original Festo parts in factory packaging. This item is Festo part number 186453, type code LR-1/4-D-7-MIDI, GTIN 4052568076184. We do not sell copies or refurbished units.
Do you ship to Iraq, Saudi Arabia and other Arab markets?
Yes. We ship worldwide from our warehouses and we have local agents in 11 countries, including Saudi Arabia, Iraq, the United Arab Emirates, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan. Send us the part number and the quantity and we will quote delivery to your city.
All Festo LR G1/4 models we supply
Every option combination in this connection size, with the Festo part number for each one.
| Model | Festo part number | Size | Regulation range | Non-return | Gauge | Flow |
|---|---|---|---|---|---|---|
| LR-1/4-D-7-I-MINI | 192301 | Mini | 0.5 to 7 bar | Yes | Yes | 1600 l/min |
| LR-1/4-D-7-MIDI (this page) | 186453 | Midi | 0.5 to 7 bar | No | Yes | 2200 l/min |
| LR-1/4-D-7-MINI | 162583 | Mini | 0.5 to 7 bar | No | Yes | 1600 l/min |
| LR-1/4-D-7-O-I-MINI | 192307 | Mini | 0.5 to 7 bar | Yes | No | 1600 l/min |
| LR-1/4-D-7-O-MIDI | 186454 | Midi | 0.5 to 7 bar | No | No | 2200 l/min |
| LR-1/4-D-7-O-MINI | 162599 | Mini | 0.5 to 7 bar | No | No | 1600 l/min |
| LR-1/4-D-I-MIDI | 192310 | Midi | 0.5 to 12 bar | Yes | Yes | 2100 l/min |
| LR-1/4-D-I-MINI | 192300 | Mini | 0.5 to 12 bar | Yes | Yes | 1500 l/min |
| LR-1/4-D-MIDI | 186451 | Midi | 0.5 to 12 bar | No | Yes | 2100 l/min |
| LR-1/4-D-MINI | 159625 | Mini | 0.5 to 12 bar | No | Yes | 1500 l/min |
| LR-1/4-D-O-I-MIDI | 192318 | Midi | 0.5 to 12 bar | Yes | No | 2100 l/min |
| LR-1/4-D-O-I-MINI | 192306 | Mini | 0.5 to 12 bar | Yes | No | 1500 l/min |
| LR-1/4-D-O-MIDI | 186452 | Midi | 0.5 to 12 bar | No | No | 2100 l/min |
| LR-1/4-D-O-MINI | 162591 | Mini | 0.5 to 12 bar | No | No | 1500 l/min |
Other connection sizes
The same LR pressure regulator is available in four connection sizes, and each one is listed on this site with every option combination.
- Festo LR G1/8 — 7 models
- Festo LR G1/4 — 14 models (this size)
- Festo LR G3/8 — 14 models
- Festo LR G1/2 — 8 models
The other family is here: Festo LFR filter regulators. A full comparison of both families with all 113 part numbers is on our Festo LFR and LR selection guide.
Accessories and spare parts
The parts most often ordered together with a Festo LFR or LR are listed below. Send us the part number and we will quote the matching items in the same offer.
- Replacement filter cartridges and condensate bowls for the LFR
- Pressure gauges MA and MAP for units supplied without a gauge
- Mounting brackets HR and connecting plates for building service unit combinations
- Shut-off valve HE, soft-start valve HEE and lubricator LOE from the same D series
- Push-in fittings QS and threaded fittings for the G ports
- Regulator lock LRVS where the pressure setting must be secured against tampering
Ordering and delivery
RendatSP supplies genuine Festo LR-1/4-D-7-MIDI units, Festo part number 186453, new and in original packaging. Prices are quoted on request because they depend on quantity and destination. Send the part number and the quantity through the order form on this page, by email to info@rendatsp.com, or on WhatsApp at +86 181 5871 1787, and we normally reply with a price and a delivery time within 24 hours.
We hold more than 100,000 industrial spare parts on request, serve over 500 factories, and ship worldwide with local agents in Saudi Arabia, Iraq, the United Arab Emirates, Egypt, Oman, Libya, Morocco, Mauritania, Yemen, Algeria and Jordan. If you are replacing a unit on a machine, send a photo of the label or of the unit itself and our engineers will identify the right part number.
