Control systems Self-acting controls
4
Materials
1
4
5 3
7 14 8 13 12
2
16
4.5 41
No.
Part
Material
1
Body
Bronze
CC 491 KM
KB51 and 1 ½ " KC51
Bronze
CC 491 KM
2
Bonnet
KC51
2"
Steel
EN 10213 GP240 GH+N
3 4
Valve head
Stainless steel
BS 970 431 S 29
Valve seat ring
Stainless steel
BS 970 431 S 29
1"
Mild steel
BS 1449 CS 4
5
Valve seat gasket
1 ½ " to 2"
Reinforced exfoliated graphite
6
Return spring
Stainless steel
BS 2056 302 S 26
KB51
Brass
BS 2874 CZ 121
7
Stem
KC51
Stainless steel
BS 970 321 S20
8
Bonnet gasket
Reinforced exfoliated graphite
Studs
Steel
BS 4439 Gr. 8.8
12
Bonnet
Nuts
Steel
BS 3692 Gr. 8
KB51
Phosphor bronze
EN 12449 Cu Sn 6
13
Bellows
KC51
Stainless steel
AISI 316L
14
Bellows gasket
Reinforced exfoliated graphite
16
Plunger
Brass
BS 2874 CZ 121
TI-P078-04 CTLS Issue 10
Page 3 of 5
KB51 and KC51 Bronze Self-Acting Control Valves
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