Size and pipe connections: Boiler house Bottom blowdown systems
2
DN15, DN20, DN25, DN32, DN40 and DN50
½", ¾", 1", 1¼", 1½", 2" Flanged EN 1092 PN40 Flanged ASME 300
For alternative connections to those stated opposite please contact Spirax Sarco.
Materials
No. Part
Material
No. Part
Material
17 Nut
BBV4_ Carbon Steel BBV6_ Stainless Steel
Carbon Steel
1
Body
18 Upper housing
Carbon Steel
2 3 4 5
19 Diaphragm
Plug
Stainless Steel + stellite
Reinforced NBR
2.11 2
20 Gasket
Seat
Stainless Steel + stellite
Reinforced Graphite
21 Vent plug
Seat gasket
Reinforced exfoliated graphite
Brass
22 Bolt
Seat retainer
Stainless Steel
Carbon Steel
23 Diaphragm plate
BBV4_ Carbon Steel BBV6_ Stainless Steel
Aluminium
6
Cover
24 Spindle
Stainless Steel
25 Lever stem
BBV__P PTFE BBV__H Graphite
Stainless Steel
7
Packing
26 Screw
Carbon Steel
8
27 Seal
Cover gasket
Reinforced exfoliated graphite
Polyurethane
28 Spring
Spring Steel
BBV__H Stainless Steel BBV6_ Other Carbon Steel BBV__H Stainless Steel BBV6_ Other Carbon Steel BBV6_ Stainless Steel Other Carbon Steel
29 Spring guide
9
Stainless Steel
Bonnet nuts
30 Connector
Stainless Steel
31 Lever
SG Iron
32 Axis
10 Bonnet studs
Stainless Steel
33 Roller
Stainless Steel
34 Spring graphite
Spring Steel
Actuator clamp nut
11
35 Elastic ring 36 Elastic ring
Carbon Steel
12 Gland nut
Carbon Steel
Stainless Steel
37 Washer
13 Scraper ring
Carbon Steel
PTFE
38 O'ring
14 Yoke
Viton
SG Iron
39 Spacer
15 Closed plate
Carbon Steel
Stainless Steel
40 Washer
16 Hex. head screw
Carbon Steel
Carbon Steel
Kvs values Valve size
DN15
DN20
DN25
DN32
DN40
DN50
Seat diameter (mm)
22
25
Kvs values
4.9
7.2
10
18
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
TI-P405-51 EMM Issue 6
Page 2 of 11
BBV Automatic or Manually Actuated Boiler Blowdown Valves DN15 to DN50
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