BFPX - Back Flow Preventer
Datasheet
Download datasheet (PDF)Specifications are indicative. Final specification is confirmed at quotation.
Specifications
Confirmed at quote- Size Range
- DN50 to DN400
- Pressure Class
- PN10, PN16
- End connection
- Threaded · Flanged
- Operating temperature
- -10°C to 80°C
Standards
- Design & manufacture
- EN 1717, EN 12729, ISO 5752, EN 1092-2, ISO 7005-2
Configure your variant(manually adjust box on the right if you require a different spec)
- Size
- Pressure
- End connection
Materials
All available material options per part. Click a pill to set it in the configurator.
- Body
- Bonnet
- Wedge
- Seat
- Stem
- Bushing
- Gasket
- O-Ring
- Spring
- Back Retainer
- Back Seat
- Bolt
- By Body
- Diaphragm
- Down Retainer
- Front Retainer
- Front Seat
- Hex Bolt
- Nut
- Relief Joint
- Spring Seat
- Up Retainer
Pressure-temperature rating
Maximum working pressure at each temperature, per pressure class.
| Class | Pressure | Min temp | Max temp |
|---|---|---|---|
| PN10 | 10 bar | -10°C | 80°C |
| PN16 | 16 bar | -10°C | 80°C |
Dimensions per size(11 sizes)
| Size | L (F/F) (mm) | PN10 ØD (mm) | PN10 ØK (mm) | PN10 n-Ød (mm) | PN16 n-Ød (mm) | PN16 ØD (mm) | PN16 ØK (mm) | Weight |
|---|---|---|---|---|---|---|---|---|
| DN50 | 230 | 165 | 125 | 4-Ø19 | - | - | - | — |
| DN65 | 236 | 185 | 145 | 4-Ø19 | - | - | - | — |
| DN80 | 276 | 200 | 160 | 8-Ø19 | - | - | - | — |
| DN100 | 298 | 220 | 180 | 8-Ø19 | - | - | - | — |
| DN125 | 303 | 250 | 210 | 8-Ø23 | - | - | - | — |
| DN150 | 364 | 285 | 240 | 8-Ø23 | - | - | - | — |
| DN200 | 470 | 340 | 295 | 8-Ø23 | 12-Ø23 | - | - | — |
| DN250 | 530 | 395 | 350 | 12-Ø23 | 12-Ø28 | 405 | 355 | — |
| DN300 | 580 | 445 | 400 | 12-Ø23 | 12-Ø28 | 460 | 410 | — |
| DN350 | 690 | 505 | 460 | 16-Ø23 | 16-Ø28 | 520 | 470 | — |
| DN400 | 770 | 565 | 515 | 16-Ø28 | 16-Ø32 | 580 | 525 | — |
Technical drawings(2 pages)
Operating media
Typical applications
- Industrial cross-connections
- Irrigation systems
- Commercial buildings
- Hospitals
- Food processing
- Fire suppression
Coatings
Approvals
Features
- The BFPX provides reduced pressure zone (RPZ) backflow prevention to EN 1717 for fluid category 4 and 5 hazards
- The assembly comprises two independent check valves with a monitored relief valve in the zone between them
- If either check valve fails, the relief valve opens to atmosphere, preventing contaminated downstream water from siphoning back into the potable supply
- Mandatory for connections to industrial processes, irrigation and commercial premises under current European water regulations
- Adjustable relief pressure and adjustable relief water volume, with low head loss
- High-strength ductile iron body for durability and reduced weight
- Advanced dynamic design provides streamlined flow and assures lower head loss
- Coated with powder epoxy inside and outside for corrosion resistance
- Short body length for easy installation
- Diaphragm has nylon reinforcement
Description
The BFPX provides reduced pressure zone (RPZ) backflow prevention to EN 1717 for fluid category 4 and 5 hazards. The assembly comprises two independent check valves with a monitored relief valve in the zone between them. If either check valve fails, the relief valve opens to atmosphere, preventing contaminated downstream water from siphoning back into the potable supply. Mandatory for connections to industrial processes, irrigation and commercial premises under current European water regulations.
Selection notes
This backflow preventer is supplied for threaded and flanged installation.
Sizes run DN50 to DN400, in PN10, PN16.
The body is EN-GJS-500-7.
Seat and trim options are Stainless steel AISI304. The seat, not the body, usually sets the temperature and medium limit, so confirm it against the service before ordering.
Stated service media include clean water and contaminated water.
It is catalogued for Water & Wastewater, HVAC and Industrial Process.
Working temperature is -10°C to 80°C.
Built to EN 1717, EN 12729, ISO 5752, EN 1092-2 and ISO 7005-2.
Supplier remarks
- Installation recommendations (source): flush the pipe clean before installation; horizontal installation is recommended; an isolation valve should be fitted on both sides of the backflow preventer with a strainer at its inlet; allow more than 300mm clearance between the water release nozzle and the ground. PN25 is offered as an end-connection/rating option beyond the page-stated PN10/PN16. The datasheet's Ordering Code shows two model variants (flanged and threaded); this record covers the flanged DN50-DN400 range per the flanged datasheet.
Available pressure classes
Pressure classes this product is rated to.