Double Block & Bleed Saver

Safe working behind leaking valves by installing a vacuum lock

The working principle of the DBB-SAVER is based on active evacuation of the bleed volume, thereby creating a vacuum lock between two sealing surfaces preventing leakage towards the safework area.

The bleed volume can either be the section between:

  1. both block valves in a classical DB&B configuration, or
  2. both seats in the body of a single valve, e.g. most ball, plug or gate valves, or
  3. any other combination of two valves in series, e.g. a block valve and (under conditions) a control valve without traditional isolation credits

The vacuum creates a negative pressure difference towards the safe work area. The guaranteed continuous presence of the vacuum in the bleed section makes leakage to the safe working area physically impossible.

Case Study ValveTight 

Pro/con

Maximum safety for workers
Maximizing plant availability - no risk of delays due to leaking valves.
No greasing, no risk on sudden gas blow-through.
No sealant necessary, the valve stays fit for purpose afterwards.
No dependency on last line of defense PPE.
Significant cost reduction
Heavy leaking valves might be left unrepaired

Specification

Areas of Application Gasses | Liquified Gasses | Liquids | On- & Offshore
ATEX certified ATEX II 2G Ex h IIB+H2 T4 Gb certification available (zone 1 environment).
Capabilities Fully automated design | Fail safe functionality | Local visual and audible alarm | Remote wireless online alarm functionality
Capacity Capacity rated to customers request.
Certifications / licences PED | EMC | CE
Compliance In full compliance with international guidelines and regulations on request, e.g.: Explosion safe, North American CSA, Group D, Class I, zone 1 atmosphere | International IECex compliance
Instrument air supply Compressed air or nitrogen.
Pipe diameter No limit.
Power Both 110V/60Hz and 230V/50Hz - corresponding ATEX plug necessary.
Pressure class No limit.

About Valvetight

Founded in 2014, Valvetight offers an unique solution to a widespread problem of passing valves. Instead of repairing valves or greasing them, Valvetight supplies a tool that creates a vacuum lock preventing a flow of medium to the safe working area. Valvetight offers the full range of services from tool-only to full operational support.  

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