Boiler house Blowdown vessels
2
Materials Body and insert
Zinc plated carbon steel
ASTM A216 WCB
Stem seals
Antistatic R-PTFE
Vented ball
Austenitic stainless steel
AISI 316
DN65 (2½")
Austenitic stainless steel
AISI 316
Stem
DN25 - DN50 (1" - 2")
Martensitic stainless steel
AISI 420
Seats
Carbon and graphite reinforced PTFE
PDR 0.8
Valve coefficients Size
DN25 (1")
DN32 (1¼")
DN40 (1½")
DN50 (2")
DN65 (2½")
Kv value
30
40
81
103
197
2.9 11
For conversion: Cv (UK) = Kv x 0.963 Cv (US) = Kv x 1.156
How to specify DN40 key operated boiler blowdown valve, flanged PN40 with carbon reinforced seats and stainless steel key.
How to order Example: 1 off Spirax Sarco DN40 KBV21i key operated boiler blowdown valve having PN40 (F4) flanged connections.
TI-P405-47 EMM Issue 3
Page 3 of 7
KBV21i and KBV40i Key Operated Boiler Blowdown Valve
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