High performance 3 piece full bore 316 Stainless Steel ball valve with BSP threaded connections and a spring return 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 spring return pneumatic actuator which allows a fail safe position if air is lost. 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) Size (mm) Actuator Media Pressure Media Temperature Actuator Pressrue Actuator Port Size
BLS52B-SR-RT 1/4 8 SR50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS53B-SR-RT 3/8 10 SR50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS54B-SR-RT 1/2 15 SR50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS55B-SR-RT 3/4 20 SR50 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS56B-SR-RT 1 25 SR63 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS57B-SR-RT 1 ¼ 32 SR75 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS58B-SR-RT 1 ½ 40 SR75 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS59B-SR-RT 2 50 SR88 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/8"
BLS510B-SR-RT 2 ½ 63 SR100 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/4"
BLS511B-SR-RT 3 80 SR115 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/4"
BLS512B-SR-RT 4 100 SR125 Vacuum (29" Hg) to 63 BAR (10 BAR Steam) -20°C to 180°C 6 to 8 BAR 1/4"

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

Also available in NPT, please contact us.

Stainless Steel Spring Return Ball Valve Pressure vs Temperature

Model Size Actuator d L h A B P
BLS52B-SR-RT 1/4" SR50 11 50 32.5 138 90 1/8"
BLS53B-SR-RT 3/8" SR50 12.5 60 32.5 138 90 1/8"
BLS54B-SR-RT 1/2" SR50 15 75 42 138 90 1/8"
BLS55B-SR-RT 3/4" SR50 20 80 50 138 90 1/8"
BLS56B-SR-RT 1" SR63 25 90 58 162 100 1/8"
BLS57B-SR-RT 1-1/4" SR75 32 110 64 208 117 1/8"
BLS58B-SR-RT 1-1/2" SR75 40 10 69.5 208 117 1/8"
BLS59B-SR-RT 2" SR88 50 140 78 245 136 1/8"
BLS510B-SR-RT 2-1/2" SR100 65 185 100 266 142 1/8"
BLS511B-SR-RT 3" SR115 80 205 112.5 310 172 1/4"
BLS512B-SR-RT 4" SR125 100 240 125.5 340 184 1/4"

All dimensions 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 Spring Return Pneumatic

Product History