KARX - Combination Kinetic Air Release Valve
Datasheet
Download datasheet (PDF)Specifications are indicative. Final specification is confirmed at quotation.
Specifications
Confirmed at quote- Size Range
- DN25 to DN300
- Pressure Class
- PN10, PN16, PN25
- End connection
- Threaded · Flanged
- Operating temperature
- -10°C to 80°C
Standards
- Design & manufacture
- BS EN 1074-4, AWWA C512
- Face to face
- BS EN 558
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
- Seat
- O-Ring
- Buffer
- Cover
- Float
- Guide Barrel
- Hex Bolt
- Nozzle Seat
- Pillar
- Screen
- Sealing Arc
- Small Nozzle
- Washer
Pressure-temperature rating
Maximum working pressure at each temperature, per pressure class.
| Class | Pressure | Min temp | Max temp |
|---|---|---|---|
| PN16 (threaded) | 16 bar | -10°C | 80°C |
| PN25 (flanged, DN50-DN200) | 25 bar | -10°C | 80°C |
Dimensions per size(26 sizes)
| Size | ØA (BSP) | C (mm) | H (mm) | ØB (mm) | ØD (mm) | ØK (mm) | N-Ød (mm) | Max water flow rate (m3/h) (m3/h) | Bore of outlet (mm) | Small orifice size (mm) | Weight |
|---|---|---|---|---|---|---|---|---|---|---|---|
| DN25 (threaded) | G1" | 20 | 243 | - | - | - | - | - | - | - | — |
| DN32 (threaded) | G1 1/4" | 20 | 243 | - | - | - | - | - | - | - | — |
| DN40 (threaded) | G1 1/2" | 20 | 243 | - | - | - | - | - | - | - | — |
| DN50 (threaded) | G2" | 20 | 243 | - | - | - | - | - | - | - | — |
| DN50 PN10 | - | - | 280 | 99 | 165 | 125 | 4-Ø19 | 1360 | 75 | 2 | — |
| DN50 PN16 | - | - | 280 | 99 | 165 | 125 | 4-Ø19 | 1360 | 75 | 2 | — |
| DN50 PN25 | - | - | 280 | 99 | 165 | 125 | 4-Ø19 | 1360 | 75 | 2 | — |
| DN65 PN10 (reduced bore) | - | - | 284 | 118 | 185 | 145 | 4-Ø19 | - | - | - | — |
| DN65 PN16 (reduced bore) | - | - | 284 | 118 | 185 | 145 | 4-Ø19 | - | - | - | — |
| DN80 PN10 | - | - | 362 | 132 | 200 | 160 | 8-Ø19 | 4160 | 95 | 3 | — |
| DN80 PN16 | - | - | 362 | 132 | 200 | 160 | 8-Ø19 | 4160 | 95 | 3 | — |
| DN80 PN25 | - | - | 362 | 132 | 200 | 160 | 8-Ø19 | 4160 | 95 | 3 | — |
| DN100 PN10 | - | - | 395 | 156 | 220 | 180 | 8-Ø19 | 8500 | 130 | 3.5 | — |
| DN100 PN16 | - | - | 395 | 156 | 220 | 180 | 8-Ø19 | 8500 | 130 | 3.5 | — |
| DN100 PN25 | - | - | 395 | 156 | 235 | 190 | 8-Ø23 | 8500 | 130 | 3.5 | — |
| DN150 PN10 | - | - | 485 | 211 | 285 | 240 | 8-Ø23 | 19100 | 170 | 4 | — |
| DN150 PN16 | - | - | 485 | 211 | 285 | 240 | 8-Ø23 | 19100 | 170 | 4 | — |
| DN150 PN25 | - | - | 485 | 211 | 300 | 250 | 8-Ø28 | 19100 | 170 | 4 | — |
| DN200 PN10 | - | - | 582 | 266 | 340 | 295 | 8-Ø23 | 33400 | 230 | 5.5 | — |
| DN200 PN16 | - | - | 582 | 266 | 340 | 295 | 12-Ø23 | 33400 | 230 | 5.5 | — |
| DN200 PN25 | - | - | 582 | 274 | 360 | 310 | 12-Ø28 | 33400 | 230 | 5.5 | — |
| DN250 PN10 (reduced bore) | - | - | 602 | 319 | 405 | 350 | 12-Ø23 | - | - | - | — |
| DN250 PN16 (reduced bore) | - | - | 602 | 319 | 405 | 355 | 12-Ø28 | - | - | - | — |
| DN250 PN25 (reduced bore) | - | - | 602 | 330 | 425 | 370 | 12-Ø31 | - | - | - | — |
| DN300 PN10 | - | - | 750 | 370 | 460 | 400 | 12-Ø23 | 76300 | 330 | 6 | — |
| DN300 PN16 | - | - | 750 | 370 | 460 | 410 | 12-Ø28 | 76300 | 330 | 6 | — |
* Max water flow rate is the KARX quick-selection guide figure for the recommended main pipe size (source: AFC KARX datasheet, Quick Selection Table); flanged DN50-DN300 sizes only. The threaded DN25-DN50 range shares one combined performance line in source (max ~760 m3/h main pipe flow, 1.4mm small orifice, 50mm outlet bore) not broken out per individual threaded size here.
Technical drawings(4 pages)
Operating media
Typical applications
- Large diameter transmission mains
- Raw water mains
- Rising mains
- Bulk water supply
Approvals
Features
- The KARX is a high-capacity combination air release valve designed for large diameter transmission mains where rapid venting of large air volumes is critical
- The oversized kinetic orifice minimises back pressure during filling, reducing pipe stress and fill times
- Continuous air release under pressure prevents air locking in rising mains and hilly pipeline profiles
- Advanced design with simple mechanism, strong float to prevent cracking during sudden water hammer and quick closure
- Aerokinetic mechanism resists blow-shut under high air velocity, even up to sonic velocity of air
- No arms or levers, so nothing to vibrate, bend or hold the float directly closed
- Smooth cage outside the float keeps it moving on a specified guide rail
- Bottom rubber buffer prevents collision damage, with drain holes around the cage for easy drainage during vacuum
- Optional outside screen guards against insects or birds entering
- Fully fusion epoxy coated inside and outside for long-term service
- Manufactured to BS EN 1074-4 and AWWA C512
- Flange drilling and dimensions to BS EN 1092, BS EN 558 and ANSI flange
- If water hammer is a concern, consult factory
Description
The KARX is a high-capacity combination air release valve designed for large diameter transmission mains where rapid venting of large air volumes is critical. The oversized kinetic orifice minimises back pressure during filling, reducing pipe stress and fill times. Continuous air release under pressure prevents air locking in rising mains and hilly pipeline profiles.
Selection notes
This air release valve is supplied for threaded and flanged installation.
Sizes run DN25 to DN300, in PN10, PN16, PN25.
The body is EN-GJS-500-7.
Seat and trim options are NBR/EPDM. 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.
It is catalogued for Water & Wastewater.
Working temperature is -10°C to 80°C.
Built to BS EN 1074-4, AWWA C512, BS EN 558 and BS EN 1092.
Available pressure classes
Pressure classes this product is rated to.
Used in
Related guides
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