2.11.3

No. Part

BBV4_

1 Body

BBV6_

BBV8_

2 Plug

3 Seat

4 Seat gasket

5 Seat retainer

BBV4_

Material

Carbon Steel

Stainless Steel

Alloy Steel

Stainless Steel

Stainless Steel

Reinforced

exfoliated graphite

Stainless Steel

Carbon Steel

Stainless Steel

Alloy Steel

PTFE

Graphite

Reinforced

exfoliated graphite

Stainless Steel

Carbon Steel

Stainless Steel

Carbon Steel

Stainless Steel

Carbon Steel

Stainless Steel

PTFE

SG Iron

Stainless Steel

Carbon Steel

Carbon Steel

Carbon Steel

Reinforced NBR

Reinforced Graphite

Brass

Materials

Item numbers 1-21

Boiler house

Bottom blowdown systems

6 Cover

7 Packing

BBV6_

BBV8_

BBV__P

BBV__H

8 Cover gasket

BBV__H

9 Bonnet nuts BBV6_

6

11

14

10

Bonnet

studs

11

Actuator

clamp nut

12 Gland nut

13 Scraper ring

14 Yoke

15 Closed plate

16 Hex. head screw

17 Nut

18 Upper housing

19 Diaphragm

20 Gasket

21 Vent plug

Page 2 of 17

8

Other

BBV__H

BBV6_

Other

BBV6_

Other

9, 10

6

7

1

DN15 BBV_3 PN / M shown

Kvs values

Valve size

Seat diameter (mm)

Kvs values

For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156

19

20

DN15 DN20 DN25

8

10

12

1.6

2.5

4.0

DN32

12

4.0

DN40 DN50

16

20

6.3

10

DN65

25

16

16, 17

15

13

TI-P405-51 AB Issue 1

BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN65

5

3

2

4

18

21