Control valves

Self-acting controls

Page 2 of 3

4.5.21

KA31 and KA33

unbalanced trim

1

4

5

3

6

8

2

7

KB31, KB33 and KC31

balanced trim

Materials

No. Part

1 Body

2 Bonnet

3 Valve head

4 Valve seat ring

5 Valve seat gasket

6 Return spring

7 Stem

8 Bonnet gasket

12

Bonnet studs

Bonnet nuts

13 Bellows

14 Bellows gasket

15 Bonnet bush

16 Plunger

KA and KB

KC - 11⁄2"

KC - 2"

DN15 - DN25

DN32-DN50

KA and KB

KC

KB

KC

Material

Cast iron

Cast iron

Cast iron

Steel

Stainless steel

Stainless steel

Mild steel

Reinforced exfoliated graphite

Stainless steel

Brass

Stainless steel

Reinforced exfoliated graphite

Steel

Steel

Phosphor bronze

Stainless steel

Reinforced exfoliated graphite

Brass

Brass

1

4

5

3

7

14

8

12

13

2

15

16

DIN 1691 GG 25

DIN 1691 GG 25

DIN 1691 GG 25

EN 10213 GP240 GH+N

BS 970 431 S 29

BS 970 431 S 29

BS 1449 CS 4

BS 2056 302 S 26

BS 2874 CZ 121

BS 970 321S20

BS 4439 Gr. 8.8

BS 3692 Gr. 8

EN 12449 Cu Sn 6

AISI 316 L

BS 2874 CZ 121

BS 2874 CZ 121

KA31, KA33, KB31, KB33 and KC31 Cast Iron Self-acting Control Valves

TI-P078-02 CH Issue 10

Page 2 of 3