A Guide to Double Block and Bleed Valve

Posted by tomy yeh


To achieve isolation in a specific position, the double block and bleed valve is used by engineers. The double block valve is a combination of two block valves which are assembled with the bleed valve to serve the purpose of isolation.
The assembly of these valves may vary from situation to situation. For example, when you are dealing with a critical serving process such as hydrocarbons serving, double block valve in combination with the bleed valve is recommended to be used.
When the situation is not critical, then the use of single block valve along with bleed valve is also enough to handle the pressure.
How to Use the Double Block and Bleed Valve?
· Both double block and bleed valves are closed.
· The one side of this assembly is shut down. This side is drained when the engineers are ready for maintenance.
· When the fluid is trapped in the space between two block valves, the bleed valve makes it possible for the fluid to relieve that space.
Applications of Double Block and Bleed Valve:
· Since the assembly of these valves provides zero leakage, these valves are most widely used valves in the pipelines these days.
· Because of saving the fluid from leakage, the costly multivalve system has been replaced by these valves. The use of this assembly by far reduces the cost.
· When there is interaction with the critical fluid transmission, it becomes very important for the engineers to ensure that there is no leakage. The block valve along with bleed valve is used in different combinations to fit the particular need of the person.
· These valves are widely being used in petrochemical, natural gas, storage and transmission industry, etc.
· The double valve and bleed valve are very efficient in providing consistent zero leakage in storage and transmission market.
Tips to Use the Double Block and Bleed Valve:
Here are the guidelines for you to make you use these valves in a right way to achieve better results.
· Since these valves are used in critical situations, it is very important to check these valves before practically using them. The main purpose of testing these valves is to know if they are perfect to fit the need.
· It is very important to know that which combination of block and bleed valve is going to work in a particular situation. Although the double valves tremendously provide the isolation, using the double block valves with bleed valves in every situation is not useful.
· Before you choose the valve of any type, it is recommended to consider several factors that may affect the type of valve you have chosen. Some of the common factors to consider are the media, application, environmental challenges, etc.
· The user of the valve should carefully look into the design of the valve so that he can understand what the manufacturer means by this design. Looking into the design can let you know if the valve you have chosen is perfect for positive isolation.  
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