Control valves

Self-acting controls

4.5.47

Cast iron valves - flange d PN16

Bronze valves - screwed and flanged PN25

TI-P047-01

CH Issue 12

TW

Three-port

Self-acting Control Valve for Liquid Systems

Description

The TW valve is a 3-port self-acting control valve for liquid systems

(including sea water) and can be used for mixing or diverting

applications. It is used in conjunction with a Spirax Sarco SA control

system to provide a self-acting temperature control unit.

Alternatively, it can be used as an electrically actuated temperature

control valve by fitting an EL7200 Series electric actuator with a

suitable temperature transmitter and controller.

O

Available types

Bronze valves

Cast iron valves

Screwed

3⁄4", 1" and 11⁄2"

Flanged

DN50

Flanged

DN50, DN80 and DN100

X

3

11

5

4

7

13

9

12

Materials

No. Part

1

Body

8

7

2

1

12

4

Sizes and pipe connections

Bronze valves

3⁄4", 1" and 11⁄2" screwed BSP (BS 21 parallel) or NPT.

DN50 standard flange EN 1092 PN25 which also meets the

face-to-face dimensions of PN16 and PN10.

DN50, DN80 and DN100 standard flange EN 1092 PN16 which

also meets the face-to-face dimensions of PN10.

Z

O

Cast iron valves

Pressure/temperature limits

Pressure bar g

Pressure bar g

The product must not be used in this region.

X

6

1

3

2

Z

10

8

14

11

Material

Bronze

Cast iron

Bronze

FEP/silicone rubber 'O' ring

2

Piston

3

Piston sealing ring

4

Stem

DN20 - DN40

DN50 - DN100

5

Spacer piece

6

Lock-nut

7

Return spring

Return DN20 - DN40

8

spring

cover

DN50 - DN100

9

Bonnet

10 Cover sealing ring

11 Bonnet

DN20 - DN25

DN40 - DN100

12 Bonnet gasket

CC491 KM

EN GJL 250

CC491 K or CC491 KM

Body design conditions

Cast iron

Bronze

PN16

PN25

16 bar g @ 120°C

25 bar g @ 120°C

200°C @ 13.5 bar g

200°C @ 21.0 bar g

-10°C

-90°C

200°C @ 13.5 bar g

200°C @ 21.0 bar g

-10°C

Brass

Bronze

Bronze

Bronze

Stainless steel

Brass

Bronze

Bronze

Cast iron

Reinforced exfoliated graphite

Brass

CW 617N

Bronze

CC491 KM

Nickel reinforced exfoliated graphite

Steel

3

BS 2693/1

" UNF x 1 /

8

" (35 mm)

BS 2874 CZ 121

BS 2874 PB 102

BS 2874 PB 102

BS 2056 302 S26

BS 2874 CZ 121

Maximum design pressure

Cast iron

Bronze

Maximum design temperature

Cast iron

Bronze

Minimum design temperature

Cast iron

Bronze

BS 2874 BP 102

CC491 KM

EN GJL 250

Maximum operating

temperature

Cast iron

Bronze

Minimum operating temperature

Cast iron

Bronze

-20°C

Note: For lower operating temperatures consult Spirax Sarco

Maximum differential pressure

Designed for a maximum cold

hydraulic test pressure of:

3.4 bar

3⁄4", 1" and 11⁄2"

DN50, DN80 and DN100

Cast iron

Bronze

37.5 bar g

2.7 bar

24 bar g

Cover studs

Cover nuts

Leakage rate

1% of full Kv (see overleaf for Kv values)

13

14 Back seal

Steel

Bronze

BS 1768/R

BS 2874 PB 102

© Copyright 2011

Local regulations may restrict the use of this product to below the conditions quoted.

In the interests of development and improvement of the product, we reserve the right to change the specification without notice.

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