Control valves

Self-acting controls

4.5.45

Steam

saturation

curve

TI-P044-01

SB and SBRA

Gunmetal

Self-acting Temperature Control Valves

Description

9

The SB and SBRA range of two-port valve are used in conjunction

CH Issue 8

SB

with Spirax Sarco SA control systems to provide a self-acting

temperature control unit.

Alternatively, they can be used as electrically actuated

temperature control valves by fitting an EL7200 Series electric

actuator with a suitable temperature transmitter and controller.

Available types:

SB

Normally open, single seat valve

8

2

1

8

3

4

5

7

6

Optional extra bleed hole

SBRA

Optional extras

Normally closed, single seat valve or

single seat valve with bleed

Extra bleed hole bypass

Standards

These products fully comply with the requirements of the

European Pressure Equipment Directive 97/23/EC and carry

the

mark when so required.

Certification

The product is available with manufacturer's Typical Test Report.

Note: All certification/inspection requirements must be stated at

the time of order placement.

6

5

7

8

Sizes and pipe connections

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

Pressure / temperature limits

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SBRA

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Pressure bar g

This product must not be used in this region.

1

8

When the valve is operating with a self-acting temperature

7

control system in this region, a Spirax Sarco spacer must

be used.

Body design conditions

Maximum design pressure

Maximum

Fitted

25 bar g @

to a Spirax Sarco spacer

directly to an actuator

to a Spirax Sarco spacer

PN25

120°C

260°C

232°C

-10°C

260°C

232°C

Materials

No. Part

1

Body

2

Valve plug

3

Valve seat ring

4

Valve seat gasket

5

Return spring

6

Stem

7

Bonnet

8

Bonnet gasket

9

Cap

Material

Gunmetal

Stainless steel

Stainless steel

Copper

Stainless steel

Brass

design temperature

Minimum design temperature

Fitted

Maximum

operating temperature

Fitted

BS 1400 LG2

BS 970 431 S29

BS 970 431 S29

BS 2870 C102

BS 2056 302 S26

BS 2874 CZ 121

BS 2872 CZ 122

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.

© Copyright 2011

Fitted

Minimum operating temperature

directly to an actuator

Note: For lower operating temperatures consult Spirax Sarco

Maximum differential

pressure bar

Size

1⁄2"

3⁄4"

SB

17.2

10.3

SBRA

12.0

7.0

0°C

1"

6.8

Brass

Reinforced exfoliated graphite

Brass

BS 2872 CZ 122

4.7

Designed for a maximum cold hydraulic test pressure of 38 bar g

T

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m

p

e

r

a

t

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C