Pipeline ancillaries

Depressurisation valves

ISO 9001

Installation / purpose

Fitted to the pipe or

product to depressurise

the pipeline upstream

or downstream of the

product.

BDV1

or

BDV2

Fitted to the bottom of

the pipe or product for

draining.

Fitted to the top of the

pipe or product for

venting.

BDV1

or

BDV2

Fitted to the strainer

cap or bottom of the dirt

pocket for the removal

of dirt.

BDV1

or

BDV2

Fitted to a PC3_ / PC4_

with cross-drilling to

test the inlet and / or

outlet of the steam

trap to ensure correct

operation.

BDV1

or

BDV2

7.15.1

TI-P600-01

ST Issue 9

Cert. No. LRQ 0963008

Description

The BDV depressurisation valves are designed to be fitted into

", 1⁄2" and DN15 connections for drain/blowdown/purge and

vent/depressurisation of pipework or products.

The BDV1 provides discharge straight through the valve, generally

to be used as a drain, or for line depressurisation where discharge

is directed to grade/atmosphere.

The BDV2 provides side connection discharge, generally to be used

as a vent for top pipe mounting or for line depressurisation, to ensure

discharge is piped to grade/atmosphere.

BDV1/BDV2 fitted to pipeline connectors PC3_ / PC4_ :

When a depressurisation valve type BDV1/BDV2 is fitted to a

pipeline connector type PC3_ / PC4_ designed for use with swivel

connector steam traps, the valve can be used for drain/vent/

depressurisation of pipework and upstream/downstream trap

testing. An internal drilling is provided in certain connector bodies

specifically for trap testing.

Where it is acceptable to discharge to atmosphere a BDV1 may be

used for line drain and trap test service. Where it is not acceptable

to discharge to atmosphere the BDV2 should be used and the

piped discharge taken to a suitable point.

For upstream trap vent applications always use a BDV2.

BDV1 and BDV2

Blowdown/Depressurisation Valves

Sizes and pipe connections

Screwed " NPT and BSP (to fit DTP strainer cap) for

BDV1

BDV2

straight through discharge.

Screwed 1⁄2" NPT and BSP for straight through discharge.

Socket weld DN15 pipe end schedule 80 to suit

ANSI B 16.11 Class 3000 for straight through discharge.

Screwed " and 1⁄2" BSP fitted with " BSP

compression fitting for side discharge with 6 mm O/D tube.

Screwed " and 1⁄2" NPT fitted with " NPT

compression fitting for side discharge with 1⁄4" O/D tube

Socket weld DN15 with " NPT

compression fitting for side discharge with 1⁄4" O/D tube.

Spirax Sarco recommendations

Applications

Depressurisation

or purge and vent

Drain

Vent

Blowdown

Trap test

Standards

Recommended

installation

BDV1

3

1

4

2

Bottom

Top

BDV2

BDV2

BDV2

2

4

1

3

5

Materials

No. Part

1 Valve body

2 Valve screw

3 Valve cone

4 Retaining ring

Material

This product fully complies with the requirements of the

European Pressure Equipment Directive 97/23/EC.

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.

Compression fitting

5

(BDV2 only)

Stainless steel

Stainless steel

Stainless steel

Stainless steel

Carbon steel

ASTM A182 F304/F304L

ASTM A276 431

AISI 440 B

BS 2056 302 S26

© Copyright 2008

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.