Spirax Sarco - Catalogo Agosto 2017

Pipeline ancillaries

Depressurisation valves

Pressure / temperature limits

Note: When the BDV1 and BDV2 are fitted for use as blowdown

valves on other products, the limiting conditions are that of the

lowest rated part. See the appropriate TI as listed in the table below

for technical data:

Dimensions / weights (approximate) in mm and kg

Type

Overall Installed

length

length A/F width

Weight

BDV1

0.17

BDV2

BSP

0.20

NPT

0.20

ASTM body

EN body

TD42S3

TD62

UTD30L, UTD30LA, UTD30H and UTD30HA

TI-P179-02

TI-P179-03

TI-P005-01

TI-P005-03

TI-P128-15

TI-P076-10

TI-P068-04

TI-P068-22

TI-S01-03

TI-P068-07

TI-P068-23

TI-P068-08

TI-P154-01

FTC80

BPC32Y

BPS32Y

PC20

SMC32Y

TD3-3

TD42

TD42L, TD42LA, TD42H and TD42HA

TD42S2

BDV2 shown

��

�

The product must not be used in this region.

Body design conditions

ANSI Class 600 (ISO PN100)

Steam

saturation

curve

�

��

Pressure 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

 PMX Maximum differential pressure

100 bar g @ 200°C

455°C @ 66 bar g

0°C

85 bar g

455°C @ 66 bar g

0°C

80 bar g

Minimum operating pressure for satisfactory operation

Designed for a maximum cold hydraulic test pressure of 150 bar g

Safety information, installation and maintenance

For full details see the Installation and Maintenance Instructions

(IM-P600-02) supplied with the product.

Warning - Pressure

BDV1 and BDV2 valves are generally used to depressurise a system /

vessel prior to maintenance or removal. Do not assume that the system

has depressurised even if a pressure guage indicates zero.

Consider the direction of the depressurised flow and ensure that this

will not cause a hazard to yourself or others. Suitable tubing should

be fitted to ensure a safe discharge.

Warning - Temperature

Allow time for temperature to normalise after depressurisation to

avoid danger of burns.

Installation note:

Where BDV1 or BDV2 depressurisation valves are fitted to PC3_ or

PC4_ pipeline connectors see IM-P128-06.

PMOB Maximum operating backpressure is 100% of the

upstream pressure

Kv values

For conversion:

Kv value 0.48 (cold)

Cv (UK) = Kv x 0.963

Cv (US) = Kv x 1.156

0 bar g

Recommended tightening torques

No.

Part

Valve screw

Compression fitting nipple

Maintenance note:

Thread

17 mm A/F

14 mm A/F

N m

22 - 25

8 - 10

The BDV is a maintenance free product with long life expectancy.

Disposal

This product is recyclable. No ecological hazard is anticipated with

the disposal of this product, providing due care is taken.

How to order

Example: 1 off Spirax Sarco DN15 BDV1 depressurisation

valve having austenitic stainless steel body with male pipe end

Schedule 80 connections to ANSI B 16.11 Class 3000.

BDV1 and BDV2 Blowdown/Depressurisation Valves

TI-P600-01 ST Issue 9