Pipeline ancillaries

Bellows sealed stop valves

Spirax SafeBloc

TM

DBB3

Double Block and Bleed Bellows Sealed Stop Valve

Cert. No. LRQ 0963008

ISO 9001

Description

The Spirax SafeBloc

TM

is a double block and bleed bellows

sealed stop valve, accommodated within the same face-to-face

dimension of a single valve. It has been designed for use as an

in-line double isolation valve on steam, gas, liquid, condensate

and water systems.

Available types

DBB3 steel body and bonnet with PN40 or ANSI 300 connections.

Seat leakage

Disc to seat shut-off conforms to EN 12266-1 Rate A leakage and

ISO 5208 Rate A.

Bleed valve options

A bleed valve connection is provided to depressurise the

downstream when the upstream valve is isolated. This can be

supplied with either a DN15 flanged, 1⁄2" screwed BSP or NPT

or 1⁄2" socket weld connection and must be stated at the time of

order placement.

Standards

This product fully complies with the requirements of the

European Pressure Equipment Directive 97/23/EC and carries

the

mark when so required.

Certification

This product is available with certification to EN 10204 3.1.

Note: All certification/inspection requirements must be stated

at the time of order placement.

Size and pipe connections

DN15, DN20, DN25, DN40, DN50, DN65, DN80 and DN100.

Flanged EN 1092 PN40 or ANSI B 16.5 Class 300.

Face-to-face dimensions conform to BS EN 558:2008.

Kv values

Size

DN15 DN20 DN25 DN40 DN50 DN65 DN80 DN100

1⁄2"

3⁄4"

1"

11⁄2"

2"

21⁄2"

3"

4"

Kv

4

4.5

8

22

32

70

123

144

For conversion: Cv (UK) = Kv x 0.963

Cv (US) = Kv x 1.156

Pressure / temperature limits (ISO 6552)

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ANSI 300

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Bleed valve connection

Steam

saturation

curve

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Pressure bar g

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The product must not be used in this region.

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Body design conditions

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO

Maximum operating pressure

for saturated steam service

TMO Maximum operating temperature

Minimum operating temperature

PN40

40 bar g @ 0°C

400°C @ 24 bar g

-10°C

30.4 bar g

400°C @ 24 bar g

PMA Maximum allowable pressure

TMA Maximum allowable temperature

Minimum allowable temperature

PMO

Maximum operating pressure

for saturated steam service

TMO Maximum operating temperature

Minimum operating temperature

ANSI 300

51 bar g @ 37.7°C

425°C @ 28 bar g

-29°C

-10°C

Note: For lower operating temperatures consult Spirax Sarco

-29°C

Note: For lower operating temperatures consult Spirax Sarco

Designed for a maximum cold hydraulic test pressure of 60 bar g

Designed for a maximum cold hydraulic test pressure of 77 bar g

Page 1 of 3

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 2009

The product must not be used in this region.

Body design conditions

TI-P184-08

ST Issue 5

T

e

m

p

e

r

a

t

u

r

e

°

C

T

e

m

p

e

r

a

t

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°

C

41.6 bar g

425°C @ 28 bar g