Control systems Self-acting controls
4
Materials
1
1
4
4
5
5 3
3
7
14
6
8
8
13 12
2
2
16 15
7
4.5 29
KA31 and KA33 unbalanced trim
KB31 and KB33 balanced trim
No.
Part
Material
1 2 3 4
Body
Cast iron
DIN 1691 GG 25
Bonnet
Cast iron
DIN 1691 GG 25
Valve head
Stainless steel
BS 970 431 S 29
Valve seat ring
Stainless steel
BS 970 431 S 29
DN15-DN25
Mild steel
BS 1449 CS 4
5
Valve seat gasket
DN32-DN50
Reinforced exfoliated graphite
6 7 8
Return spring
Stainless steel
BS 2056 302 S 26
Stem
Brass
BS 2874 CZ 121
Bonnet gasket
Reinforced exfoliated graphite
Bonnet studs
Steel
BS 4439 Gr. 8.8
12
Bonnet nuts
Steel
BS 3692 Gr. 8
13 14 15 16
Bellows
Phosphor bronze
EN 12449 Cu Sn 6
Bellows gasket
Reinforced exfoliated graphite
Bonnet bush
Brass
BS 2874 CZ 121
Plunger
Brass
BS 2874 CZ 121
TI-P078-02 CTLS Issue 14
Page 3 of 5
KA31, KA33, KB31 and KB33 Cast Iron Self-acting Control Valves
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