SKU: BLSDA

Stainless Steel Double Acting Ball Valve

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High performance 3 piece full bore 316 Stainless Steel ball valve with BSP threaded connections and a double acting pneumatic actuator. Self adjusting stem packing assembly with Belleville spring for temperature fluctuations and vibration. Pre drilled metric hole on ISO5211 direct mounting pad to minimise any thermal transfer from valve to actuator. Reinforced PTFE seats for temperatures up to 180°C. Anodised aluminium double acting pneumatic actuator. Typical applications include water treatment, chemical, marine, petrochemical and general industry. Length to DIN3202-M3 and Threads to ISO7/1. Watermark valves available upon request, contact Sales for more information. Watermark License Number WMK26529 approved to WMTS 012:2018.

Model Size (BSP) DN (mm) Actuator Media Pressure Media Temperature Actuator Pressure Actuator Port Size
BLS2B-DA-RT 1/4 8 DA50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS3B-DA-RT 3/8 10 DA50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS4B-DA-RT 1/2 15 DA50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS5B-DA-RT 3/4 20 DA50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS6B-DA-RT 1 25 DA50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS7B-DA-RT 1 ¼ 32 DA63 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS8B-DA-RT 1 ½ 40 DA63 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS9B-DA-RT 2 50 DA75 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS10B-DA-RT 2 ½ 65 DA88 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS11B-DA-RT 3 80 DA100 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/4"
BLS12B-DA-RT 4 100 DA115 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/4"

Also available in NPT, please contact us.

Stainless Steel Double Acting Ball Valve Pressure vs Temperature

Model Size Actuator d L h A B P
BLS2B-DA-RT 1/4" DA50 11 50 32.5 138 90 1/8"
BLS3B-DA-RT 3/8" DA50 12.5 60 32.5 138 90 1/8"
BLS4B-DA-RT 1/2" DA50 15 75 42 138 90 1/8"
BLS5B-DA-RT 3/4" DA50 20 80 50 138 90 1/8"
BLS6B-DA-RT 1" DA50 25 90 58 138 90 1/8"
BLS7B-DA-RT 1-1/4" DA63 32 110 64 162 100 1/8"
BLS8B-DA-RT 1-1/2" DA63 40 10 69.5 162 100 1/8"
BLS9B-DA-RT 2" DA75 50 140 78 208 117 1/8"
BLS10B-DA-RT 2-1/2" DA88 65 185 100 245 136 1/8"
BLS11B-DA-RT 3" DA100 80 205 112.5 266 142 1/4"
BLS12B-DA-RT 4" DA115 100 240 125.5 310 172 1/4"

All dimensions are in mm unless otherwise stated

Item Description Material
1 Body CF8M
2 Ball SS316
3 Ball Seat 15%R-PTFE
4 Thrust Washer PTFE
5 Body Gasket PTFE
6 O-Ring Viton
7 Stem Packing PTFE
8 Gland SS304
9 Tab Washer SS304
Item Description Material
10 Stopper SS304
11 Stem SS316
12 Belleville Washer SS301
13 Spring Washer SS304
14 Nut SS304
15 Bolt SS304
16 Cap CF8M
17 Actuator Aluminium

Size 1/4" to 4" BSP
Body 316 Stainless Steel 3 piece
Seat Reinforced PTFE
Pressure 63 BAR
Temperature -20°C to 180°C
Actuation Double Acting Pneumatic

  • What is a 3 Piece 2 Way Double Acting Pneumatic Stainless Steel Ball Valve?

    A three piece two way double acting stainless steel ball valve is constructed of three seperate body pieces and held together by the use of stainless steel tie rods with nuts at either end. It has a direct mounted anodised aluminium rack and pinion actuator fixed to the valve which conducts its 90 degree turn (open.close)This kind of ball valve design makes it easy to remove from the line as you do not need to unscrew its ends from the pipework to maintain the valve. It is also very easy to change the valve seats as you can access them directly when the ends are removed making them ideal for applications where the seat is worn regularly. Our design also has a longer neck to reduce thermal transfer and a direct mounting pad for mounting actuators without the use of a bracket and drive dog. They also have a reinforced teflon (PTFE) seat which is filled with a 15% glass filler. This allows higher pressures and temperatures up to 180 degrees celcius making it suitable for steam applications (refer to the temperature vs pressure graph). If a higher temperature is required these seats can be changed out to a 50% stainless steel seat if required. The actuator has a namur interface and position indicator.

  • How does a 3 Piece Two Way Double Acting Stainless Steel Ball Valve work?

    The 3 piece 2 way double acting ball valves works the same as any normal two way ball valve whereby the ball is rotated 90 degrees within the body of the valve which will either open or close the valve. The ball itself has a hole either end which the media will flow through when it is open. When the valve is closed these holes are blocked off to the flow effectively isolating the media either side of the valve. The ball is turned by a double acting rack & pinion actuator which is connected to a shaft which in turn is mated to the ball by a female slot. When the actuator is operated by a 5/2 valve (all double acting actuators need a 5/2 valve to operate, 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). Extras such as limit switch boxes and positioners can also be mounted directly to the actuator.

  • How long will my 3 Piece Two Way Double Acting Stainless Steel Ball Valve last?

    Like any valve this depends upon the usage case of your ball valve, its environment, media and how many times it is cycled. For instance if it is on a clean media, in a clean environment and not cycled regularly the life will be decades or more. 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 30,000 cycles is a reasonable life cycle for the ball valve depending upon the application. Being a 3 piece construction it is relatively easy to change the seats out when there wear which is the main perishable in the valve. These are available as spare parts in 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 cylces. 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 been sent to the actuator.

  • How do I install a three piece two way double acting Stainless Steel Ball Valve?

    These have female parallel BSP threaded ends so it is best to put a male tapered BSP fitting into the valve ends. Thread tape or a sealant should be used to help the seal and also if dissimilar metals are used it will reduce dissimilar metal corrosion. The tie rods can be undone if needed and the ends installed by themselves but this is usually unnecessary and you would have to measure the exact face to face before your installation. The double acting 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 standalone 5/2 valve. If you are using a stand alone 5/2 valve the air lines will need to be run from here into the ports 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 three piece two way double acting pneumatic stainless steel ball valve?

    These three piece two way ball valves are used on a wide variety of applications. Being three piece they are a higher price than an ordinary two piece ball valve but possess many advantages. This means they are usually used in higher spec applications usually in industry. This includes water treatment, steam applications to 10 bar, chemical applications and many more.

  • 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 API598 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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