Ductile Iron Spring Return Butterfly Valve with 316 Stainless Steel Disc

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The BFD (supercedes the BFK) series has a ductile iron body, 316 S.S disc, EPDM seat and a spring return pneumatic actuator making it suited to a wide range of industrial applications. These are Watermark, Standards Mark and WSAA (Water Service Association of Australia) certified. These wafer butterfly valves will fit all standard flanges and are operated by a high quality spring return (rack and pinion design) anodised aluminium pneumatic actuator. This enables a fail safe position if air should be lost. The unique bonded catridge design of the butterfly valve gives it a longer life span, allows vacuum to be run through it and enables the seat to be replaceable if ever the need should arise. Common applications include water trucks, irrigation, water treatment and other industrial applications. If using on a cement hopper please contact us. We recommend going up a size in actuator to compensate for the weight on the disc. If sizes above 600mm are required please contact us.

Model Size (mm) Actuator Media Pressure Media Temperature Actuator Pressure Actuator Port Size
BFD550-SR-E 50 SR63 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/8"
BFD565-SR-E 65 SR63 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/8"
BFD580-SR-E 80 SR75 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/8"
BFD5100-SR-E 100 SR88 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/8"
BFD5125-SR-E 125 SR100 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5150-SR-E 150 SR115 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5200-SR-E 200 SR125 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5250-SR-E 250 SR145 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5300-SR-E 300 SR180 Vacuum to 16 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5350-SR-E 350 SR200 Vacuum to 10 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5400-SR-E 400 SR240 Vacuum to 10 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5450-SR-E 450 SR270 Vacuum to 10 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"
BFD5500-SR-E 500 SR270 Vacuum to 10 BAR -20°C to 90°C (40°C Potable) 6 to 8 BAR 1/4"

For Sprung Open the ‘5’ in the product code changes to a ‘6’.

For sizes over 600mm or different seat material please contact us.

Model DN Actuator C C1 H1 H2 J K L M AS2129 Table D AS2129 Table E ANSI150
ØD1 n-Ød1 ØD1 n-Ød1 ØD1 n-Ød1
BFD550-SR-E 50 SR63 42 46.1 225 70 162 80.5 80 20 114 4-18 114 4-18 120.5 4-19
BFD565-SR-E 65 SR63 44.7 49.1 245 77 162 80.5 80 20 127 4-18 127 4-18 139.5 4-19
BFD580-SR-E 80 SR75 45.2 48.4 261 87 208 94.5 97 20 146 4-18 146 4-18 152.5 4-19
BFD5100-SR-E 100 SR88 52.1 55.3 305 112 245 109 116 20 178 4-18 178 4(8)-18 190.5 4(8)-19
BFD5125-SR-E 125 SR100 54.4 58.8 332 128 266 123 122 20 210 4(8)-18 210 4(8)-18 216 4(8)-22
BFD5150-SR-E 150 SR115 55.8 59.1 361 143 310 137 142 30 235 4(8)-18 235 4(8)-22 241.5 4(8)-22
BFD5200-SR-E 200 SR125 60.6 64.1 423 173 340 148 154 30 292 4(8)-18 292 4(8)-22 298.5 4(8)-22
BFD5250-SR-E 250 SR145 65.6 71.8 499 210 401 168.5 179 30 356 4(8)-22 356 4(12)-22 362 4(12)-25
BFD5300-SR-E 300 SR180 76.9 81 578 244 532 224 244 30 406 4(12)-22 406 4(12)-26 432 4(12)-25
BFD5350-SR-E 350 SR200 76.5 79.5 635 267 532 224 244 30 470 4(12)-26 470 4(12)-26 476 4(12)-29
BFD5400-SR-E 400 SR240 86.5 90 697 297 662 266 288 30 521 4(12)-26 521 4(12)-26 539.5 4(16)-29
BFD5450-SR-E 450 SR270 105.6 109 737 315 730 306 323 30 584 4(12)-26 584 4(12)-26 578 4(16)-32
BFD5500-SR-E 500 SR270 131.8 135 840 360 730 306 323 30 641 4(16)-26 641 4(16)-26 635 4(20)-32
BFD5600-SR-E 600 SR380 152 156 1006 444 774 335 352 30 756 4(16)-30 756 4(16)-33 749.5 4(20)-35

All dimensions in mm unless specified otherwise

Item Description Material
1 Body Ductile Iron (Fusion Bonded Epoxy Coated)
2 Seat EPDM
3 Shaft SS431
4 Disc CF8M
5 Bushing PTFE
6 O Ring NBR
  Pneumatic Actuator Anodized Aluminium

Size 50mm to 600mm
Body FBE Coated Ductile Iron
Disc 316 Stainless Steel
Pressure Up to 16 BAR (depending upon size)
Actuation Spring Return Pneumatic

  • What is a Spring Return Wafer Butterfly Valve?

    A spring return pneumatic wafer butterfly valve is a butterfly valve that is designed to clamp between two flanges without the need for the bolts to go through threaded holes on the body of the butterfly valve. It has a direct mounted anodised spring return aluminium rack and pinion actuator fixed to the valve which conducts its 90 degree turn (open/close). The valve body sits like a 'wafer' between the flanges and therefore fit multiple flange standards unlike lugged which will be designed to fit only one standard. In this case we are talking about ductile iron (similar to cast iron but better advantages in terms of strength, elongation & life) center line wafer butterfly valves. The center line refers to the location of the disc and shaft in relation to the body (there are other kinds of butterfly valves such as double & triple offset) where it is precisely in the middle. These valves can have different seat materials but the most common would be EPDM but others such as FKM, NBR or PTFE are also used. The spring return actuator has a namur interface and position indicator.

  • How does a Wafer Spring Return Pneumatic Butterfly Valve work?

    A spring return butterfly valve works by the shaft rotating 90 degrees which will take the position of the disc in the flow from open to close (or vice versa). When it is closed a seal will be formed between the disc and the seat effectively stopping the flow of the media. When it is opened again the disc comes away from the seat and when it is fully open sits side (smallest surface area facing) on to the direction of the upstream flow. This 90 degree turn is conducted by a spring return rack & pinion actuator which is connected to a shaft which in turn is mated to the disc by a spline. When the actuator is operated by a 5/2 (the most common we see is a 5/2 direct interfacing namur solenoid valve) the shaft will be rotated effectively turning the ball inside the cavity and switching it to its other state (either open or close). A 3/2 valve could be used instead which will operate one side of the pistons and rely on the spring to operate the other however we recommend a 5/2 to ensure clean air is only entering the actuator. If a 3/2 is used we would recommend a silencer is put into the unused port to help protect the actuator. Extras such as limit switch boxes and positioners can also be mounted directly to the actuator.

  • How long will my Spring Return Wafer Butterfly Valve last?

    Like any valve this depends upon the usage case of your butterfly valve, its environment, media and how many times it is cycled. For instance if it is on a clean wet media, in a clean environment and not cycled regularly the life will be decades. If it is on a corrosive media and in a dry application with a high cycle rate the life will be much shorter. We conduct regular lab testing and 6,000 cycles is a reasonable life cycle depending upon the application. One advantage of this design is that the seat is replaceable and available as a repair kit. The actuators life will depend upon how clean and dry the supply air is (the air that makes the actuator operate) however we regularly test these to over 800,000 cycles. Install a basic air filter if you are not sure about the quality of your air, we have pneumatic actuators that have been in operation for decades. The most common failure we see is due to dirty wet air being sent to the actuator (that is why we recommend to use a 5/2 valve even though the actuator only needs a 3/2, you ensure you can deliver clean air to the actuator).

  • How do I install a Spring Return Pneumatic Wafer Butterfly Valve?

    These wafer butterfly valves are designed to clamp between two flanges. The bolts will pass through from one flange to the other to give the clamping force on the valve and keep it in position. The seat of the valve also forms the gasket on the flanges so there is no need for a secondary gasket. The bolts should be tightened in a diagonal shape to avoid over tightening in one area. For a full list of instructions please visit our butterfly valve installation & maintenance guide. The spring return pneumatic actuator can accommodate a namur solenoid valve which is a very popular configuration (the 5/2 control valve bolts directly onto the actuator with an o-ring face seal on the back of the valve) or just a stand alone 5/2 valve. If you are using a stand alone 5/2 or 3/2 valve the air lines will need to be run from here into the ports/port on the actuator (remember the longer the run the slower the operation unless you use quick exhaust valves near the actuator).

  • What are typical uses of a Spring Return Wafer Butterfly Valve?

    These are very common in the water industry especially because most of our models hold a Watermark and Standards mark approval. They are also used for general purpose applications as long as the media, temperature and pressure are compatible. One main advantage of butterfly valves is they are relatively cheap compared to their size if you are comparing to another valve type (eg. ball valve). As they are spring return they are usually used in fail safe applications where you would like the butterfly valve to return to a predetermined position (either open or close) if air is lost.

  • How long will my product take to get to me? 

    This depends upon where you are based and the freight method chosen. If the express freight option is selected it is usually next day delivery to metropolitan areas in Australia for under 5kg. If free freight has been selected it will go by road freight which can be anywhere from 1 to 10 days depending upon your location. It usually averages 3 days.

  • What warranty do I get?

    All of our products come standard with a 12 month warranty. The good news is we have very strict quality controls and all valves leave our warehouse tested (full material and testing certificates to API 598 are available) and inspected so there are rarely any issues. Also once your valve is in and operating it will most likely continue to do so for a very long time. 

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