Control systems Self-acting controls
4
Materials
O
O
X
6
8 7
2
1
X
1
2 3
7 4 5
Z
3
Z
10 8 14 11
12 4
11
12 13 9
No.
Part
Material
Bronze
CC491 KM
1
Body
Cast iron
EN GJL 250
4.5 67
2 3
Piston
Bronze
CC491 K or CC491 KM
Piston sealing ring
FEP/PFA
DN20 - DN40
Brass
BS 2874 CZ 121
4
Stem
DN50 - DN100
Bronze
5 6 7
Spacer piece
Bronze
BS 2874 PB 102
Lock-nut
Bronze
BS 2874 PB 102
Return spring
Stainless steel
BS 2056 302 S26
DN20 - DN40
Brass
BS 2874 CZ 121
8
Return spring cover
DN50 - DN100
Bronze
BS 2874 BP 102
Bronze
CC491 KM
9
Bonnet
Cast iron
EN GJL 250
10
Cover sealing ring
Reinforced exfoliated graphite
DN20 - DN25
Brass
CW 617N
11
Bonnet
DN40 - DN100
Bronze
CC491 KM
12
Bonnet gasket
Nickel reinforced exfoliated graphite
Steel
Cover studs
13
" UNF x 1 3/8 " (35 mm)
BS 2693 / 1
Cover nuts
Steel
BS 1768 / R
14
Back seal
Bronze
BS 2874 PB 102
TI-P047-01 CTLS Issue 13
Page 3 of 5
TW Three-port Self-acting Control Valve for Liquid Systems
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