In the financial budget of 2021-22, our finance Nirmala Sitharaman allocated an amount of 1.97 lakh crore for the manufacturing sector through 13 PLI Schemes. Be it the petrochemical industry, fertilizer industry, or any major chemical manufacturing facility, you need the use of valves. Valves are the basic requirement before setting up any industry, without which no manufacturing process can be done.
This is because for a particular chemical reaction a specific amount of pressure is required otherwise the reaction will not take place or else will become dangerous for everyone. So, apart from just being an equipment valves are also a safety instrument that checks the flow of either gas or liquid.
Pressure Sustaining Valves
Pressure Sustaining Valve, just like other valves keeps the flow of water under control, but the uniqueness of these valves lies is that it acts as a backup system. These valves always are responsible for the upstream flow of water in the system regardless of the situation in the other parts of the system, (basically the downstream).
In case if in the manufacturing plant due to technical reasons the downstream flow is increased, so there must be an opposite upward pressure to make it normal, pressure sustaining valves thus come to use.
Variations in Pressure sustaining valves
Like in the Pressure Sustaining valves the normal pressure of water is maintained in the system by keeping the upstream of water always switched on, which keeps the system safe from any mechanical damage.
If we add a little variation to it and instead of keeping the upward flow of water on, make sure that excess pressure is released from the system through a valve, in that case also our plant is safe. This type of valves is known as a Pressure Vacuum Relief Valve, where instead of water and liquids, it keeps check of the airflow in the system.
These valves are located just at the top of the tanks or the boilers, wherever the chemical reaction is going on. In some reactions at the end, the air is absorbed by the products; this creates an atmosphere of vacuum inside the container or the tank. This vacuum can seriously damage the fittings, interior of the plant, so to prevent this situation Pressure Vacuum Relief Valve is used, which allows the air from outside to flow inside the container.
Thus, making the air pressure again back to normal.