Breather Valves, Conservation vents or Pressure Vacuum Relief Valves

Pressure Vacuum Relief Valves (they are also commonly referred to as breather valves, conservation vents or tank vents) are designed to protect the your tank from damage created by over pressure or excessive vacuum. 

We at Assentech prefer to use the name “Conservation Vent”, Because the conservation of vapours is a key part of running an efficient and effective storage tank.

Over-pressure or vacuum in a tank can happen because of several reasons like liquid movement into or out of the tank, weather changes, fire exposure and other circumstances resulting from equipment failures or  operating errors.

Combined Pressure and Vacuum (PVRV) Relief Valves allow a tank to vent (breathe in and breathe out) during filling, emptying and when thermal effects require.

By using a combined unit, you only require one nozzle and have a single piece of equipment to maintain.

All the relief valves Assentech supply are supplied with leakage and calibration certificatesLeakage testing is now part of ISO 28300 & API 2000. Most manufacturers supply only calibration certificates (not including the leakage tests) which are now technically in contravention of ISO 28300 & API 2000. Testing each vent takes a minimum of 1 hour at the factory and is not something most manufacturers include with every vent. It is usually a cost adder option but we at Assentech include it in our basic price.

Spring/Weight Operated

70Key Features of the Groth P/V include;

 

 Key Features
  • Market leading sealing performance - API 2000 states that a valve should hold 75% of its set point at constant flow of 15l / hour – Groth’s production standard is 90% in models up to an including 6”
  • Self Draining Pallets prevent build up of water and potential to freeze shut/open
  • Air cushion seat design creates superior seal and is less prone to sticking than o-ring type seals
  • There are no elastomers in Groth valves as they break down over time in common applications

 

As with all Groth equipment, their P/V valves are manufactured to the highest standards and offer market leading performance and longevity.

Groth P/V valves come with a range of standard and custom options as follows;

 

Models 1200 Series
  1700 Series
  1800 Series
  8800 Series
Sizes 2” to 12”
Pressure Settings 2.1 mbar (0.002 bar) to 1030 mbar (1.03 bar)
Vacuum Setting Range 2.1 mbar (0.002 bar) to 820 mbar (0.82 bar)
Options Free Venting outlet
  Pipe-away outlet
  Flame Arrester
  Steam Jacket
Operation Weight Loaded
  Spring Loaded
Materials of Construction Aluminium
  Carbon Steel
  Stainless Steel
  Derakane (FRP)
  Furan (FRP)
  Exotics on request
Approvals ATEX

 

Pilot-Operated Vacuum Relief Valves

72Key Features of the Groth Pilot Operated Pressure/Vacuum Relief Valve include;

 

 Key Features
  • High Flow Capacity
  • Bubble tight to set pressure
  • Fully open at less than 10% above set pressure
  • Inherent backflow prevention
  • Easily adjustable blowdown
  • Film design seat meets EPA method 21
  • Full pipe bore seat nozzle

 

As with all Groth equipment, their Pilot Operated P/V valves are manufactured to the highest standards and offer market leading performance and longevity.

Groth Pilot Operated P/V valves come with a range of standard and custom options as follows;

 

Models 1600 Series
Sizes 2” to 12”
Pressure Settings 12.9 mbar (0.012 bar) to 1030 mbar (1.03 bar)
Vacuum Settings 2.1 mbar (0.002 bar) to 820 mbar (0.82 bar)
Max. Operating Temp. 150 degC
Min. Operating Temp. 195 degC
Operation Pilot Operated
Mounting Orientation Side Mount
Materials of Construction Aluminium
  Carbon Steel
  Stainless Steel
  Multiple Pilot Valve Material Options
  Specials upon request
Approvals ATEX