Vacuum relief valves are safety devices used to protect a system or vessel in an overpressure event. An event of overpressure may be anything that causes the vessel pressure to increase beyond the specific pressure design. Since these valves act as the last line of defense, they should be reliable and independent. The following section will help you gain insight into the best applications and industries for vacuum relief valve products and various other aspects.

So, read on to find out more.

Why use vacuum relief valves?

The trapped air within a pipeline that rises and collects at high points causes faulty instrumentation readings, pump failures, flow issues, corrosion, pressure, and water hammer surges. The air also causes the pump to work harder, resulting in excess energy consumption.

The three common sources of air in the pipeline are:

  1. The pipeline itself as a pipeline is not technically empty, and the air isn’t evacuated till filled with fluid.
  2. Water contains some amount of air. Other thick fluids or adhesives also trap air in pockets. As these fluids travel through the system, the air accumulates at high points.
  3. Air is drawn to the system through equipment through pipe joints, valves, and pumps.

With vacuum relief valve products, this air is released out of the system resulting in efficient and smooth operation.

How do vacuum relief valves work?

Vacuum relief valves are present at a pipeline’s highest points where the air is collected. Air bubbles that enter the valve displace the liquid and lower its level. When the level of liquid drops, there is also a drop in float. The motion causes the seat to pull away from the orifice opening the valve to vent the accumulated air.

The air venting causes the liquid to re-enter the valve, buoying the float and lifting it till the valve is closed. The cycle repeats as many times as necessary to keep an air-free system.

The operation of vacuum release valves depends largely on proper installation. Ideally, you should install them at the system’s high points vertical to the inlet down. Also, you should add a shut-off valve below it during servicing.

What are the best applications for vacuum relief valves?

The popular areas where you find vacuum relief valves are sewer force mains and water pipelines. Usually, you can find them installed at the peaks of the system and sometimes a little downstream as well. These valves are ideal for pressurized or closed-loop piping that traps air.

What are the advantages of vacuum relief valves?

Vacuum relief valves protect a pipeline system and ensure its efficiency. These valves are excellent for venting large volumes of air during startup or filling. Also, while emptying the pipeline, these valves allow the air back into it. It is a very crucial factor as some pipes have the chance of collapsing at negative pressure. So, when the valves are installed, the operation continues automatically.

How will you choose the best vacuum relief valve?

There are numerous considerations while choosing a vacuum relief valve for science, home, or industrial project. They include type, size, material, and the purpose of its use. Also, you must check with the rules and regulations of your jurisdiction and the local government to adhere to codes or specifications during the valve selection.

Vacuum relief valves work in various ways depending on your type of valve. To make the right pick, you should have a thorough idea about your project’s requirements and then look for variations. Valve manufacturing companies can also help you choose the right valve and tell you the instructions and specifications you must remember before installing.