Pipeline ancillaries Depressurisation valves
10
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 2018
TI-P600-01 CMGT Issue 10
BDV1 and BDV2 Blowdown/Depressurisation Valves
Description The BDV depressurisation valves are designed to be fitted into " , ½ " 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. Spirax Sarco recommendations
Recommended installation
Applications
Installation/purpose
BDV1
Bottom
Top
Fitted to the pipe or product to depressurise the pipeline upstream or downstream of the product. Fitted to the bottom of the pipe or product for draining. Fitted to the top of the pipe or product for venting. Fitted to the strainer cap or bottom of the dirt pocket for the removal of dirt. 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 BDV1 or BDV2
Depressurisation or purge and vent
BDV2
7.14.2
Drain
BDV2
Vent
BDV2
BDV1 or BDV2
Blowdown
10.14 1
BDV1 or BDV2
Trap test
Standards This product fully complies with the requirements of the Pressure Equipment Directive (PED). 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.
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