NPT 316 Stainless Steel Ball Valve

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High performance 3 piece full bore 316 Stainless Steel ball valve with NPT threaded connections. 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. This ball valve has a lockable lever operation so it can be locked in one position if needed. Typical applications include water treatment, chemical, marine, petrochemical and general industry. Length to DIN3202-M3 and mounting pad to ISO5211. 

Model Size (BSP) Size (mm) Media Pressure Media Temperature Torque (NM)
BLS2N-L-RT 1/4 8 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 5
BLS3N-L-RT 3/8 10 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 5
BLS4N-L-RT 1/2 15 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6
BLS5N-L-RT 3/4 20 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 10
BLS6N-L-RT 1 25 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 16
BLS7N-L-RT 1 ¼ 32 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 24
BLS8N-L-RT 1 ½ 40 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 32
BLS9N-L-RT 2 50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 50

Stainless Steel NPT Ball Valve Pressure vs Temperature 

NPT Stainless Steel Ball Valve

Model Size (NPT) DN L W □E H H1 H2 ISO 5211 Weight (kg)
BLS2N-L-RT 1/4 8 60 120 9 63 32 7 F03/F04 0.58
BLS3N-L-RT 3/8 10 60 120 9 63 32 7 F03/F04 0.58
BLS4N-L-RT 1/2 15 75 120 9 70 40 7 F03/F04 0.62
BLS5N-L-RT 3/4 20 80 120 9 80 50 9 F03/F04 0.8
BLS6N-L-RT 1 25 90 135 11 90 57 11 F04/F05 1.15
BLS7N-L-RT 1 ¼ 32 110 150 11 95 61 11 F04/F05 2.5
BLS8N-L-RT 1 ½ 40 120 185 14 105 76 14 F05/F07 2.98
BLS9N-L-RT 2 50 140 185 14 112 84 14 F05/F07 3.3

NPT Stainless Steel 3 piece ball valve

No. Part Material
1 Bonnet ASTM A351 CF8M
2 Seat PTFE +15% Glass Filler
3 Ball ASTM A182 316
4 Gasket PTFE
5 Stem Gasket PTFE
6 O-Ring VITON
7 Body ASTM A351 CF8M
8 Packing PTFE
9 Stem ASTM A182 316
10 Packing Gland ASTM A276 304
11 Butterfly Spring PH15-7Mo
12 Stem Nut ASTM A276 201
No. Part Material
13 Packing Gland ASTM A276 304
14 Handle ASTM A276 201
15 Nut ASTM A276 201
16 Stop Pin ASTM A276 201
17 Handle Lock ASTM A276 201
18 Handle Sleeve Plastic
19 Thrust Washer ASTM A276 201
20 Anti-static Device ASTM A276 304
21 Bolt ASTM A193-B8
22 Spring Washer ASTM A193-B8
23 Nut ASTM A194-B8M


Size 1/4" to 2" NPT
Body 316 Stainless Steel 3 piece
Seat Reinforced PTFE
Pressure 63 BAR
Temperature -20°C to 180°C
Actuation Lockable Lever

  • What is a 3 Piece 2 Way Stainless Steel NPT Ball Valve?

    A three piece two way stainless steel NPT 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. This kind of design makes it easy to remove the valve from a line as you do not need to unscrew the 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 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

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

    The 3 piece 2 way 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 handle (or actuator) which is connected to a shaft which in turn is mated to the ball by a female slot. When it is operated by a handle (our handles are lockable) there is a stop pin which only allows you to operate the valve in a 90 degree turn (this will take you from open to close or vice versa). When it is operated by a gear box the gear box will hit its stop on the worm drive which will not let the ball rotate past 90 degrees.

  • How long will my 3 Piece Two Way Stainless Steel NPT 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. 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 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.

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

    These have female paralell NPT threaded ends so it is best to put a male tapered NPT 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.

  • What are typical uses of a three piece two way stainless steel NPT ball valve?

    These three piece two way NPT 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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