Benefits of Rubber Check Valves for Processing Harsh Fluids

Learn how this material choice can help municipalities prepare for extreme weather and other challenging conditions

Natural disasters remind us of the unpredictability we all face on a daily basis—but on a grander scale. Weather events especially can cause large amounts of damage with little warning and in extremely short periods of time. But their reach isn’t over when the storm passes.  Lots of property damage and even health and safety threats continue in the hours, days and weeks after natural disasters. This is true whether it’s a hurricane, a tornado, a flood, or another dangerous storm system.

The best way to minimize this damage is to prepare ahead of time.  For most individuals and municipalities, it’s not a question of if—but when—systems will be tested by a storm.  It’s everyone’s  responsibility to prepare for these storms.  For municipalities and other local governments, this means making sure infrastructure is up to date and designed to handle extreme conditions. A failure of stormwater or wastewater systems during a hurricane can take a problem from bad to worse.  In a natural disaster, stormwater drainage system components can struggle to keep up with demand. Ideally, the system would continue to drain the influx of water.  But even if the system can’t work fast enough, preventing backflow is essential.
Duckbill check valve drawing

The Dangers of Backflow

Backflow is a condition in which the fluid in a system moves backward—flowing back toward the source. Of course, backflow means the system isn’t operating as designed. It’s never a word that operators want to hear.  But backflow is most dangerous in applications that involve harsh chemicals, sewage or other hazardous fluids. Having these fluids move in a way that the system wasn’t designed to accommodate can lead to all kinds of issues. For example, stormwater that’s mixed with other system fluids could end up coming back out of storm drains and into the street. Backflow in these situations can contribute to flooding, standing water and contaminated water exposure for citizens in residential areas.

Stormwater management isn’t the only application in which backflow is a dangerous condition. For example, some systems are at risk of causing land erosion if a system failure leads to backflow. Or when dealing with other infrastructure systems, saltwater could end up in a freshwater pond. All of these risks demonstrate why preventing backflow should be a priority during system design.


The Importance of Check Valves

The check valve is a crucial system component for preventing backflow. Check valves help a system maintain one-way flow. They open based on the pressure of the fluid flowing through the system, then close to prevent the fluid from flowing back toward the system inlet.

Check valves are often overlooked because some system designers believe these nonmechanical, fully passive devices are simple, and when the best check valve is installed in a particular application or system, their dependable operation can make them seem simple. These very low- to no-maintenance, long-lasting devices quietly do their job. Once they’re installed, they can fade into the background and do their part to keep a system running for years.

But an improperly selected check valve can be a major headache. A design that’s mismatched for the application can lead to the valve being stuck in an open position. A material that doesn’t work well with the system fluid can lead to rust or corrosion, requiring frequent maintenance or replacement. And some selection errors can even lead to loud and dangerous water hammer, putting other system components at risk.

Rubber Check Valve Advantages

Choosing construction material is one important part of the check valve selection process. Opting for a rubber or elastomer material can offer some major advantages for modern applications.  Using rubber check valves helps avoid a variety of common issues with check valves of the past. Metal check valves seem like they would be durable and long-lasting, and they often are. But depending on the fluid, metal materials can have a lot of vulnerabilities as well. For example, saltwater that finds its way into a local stormwater or wastewater system can be highly corrosive to metal components. More common fluids like raw sewage can be too corrosive for many metals.

In addition, metal check valves often struggle to handle slurries with large amounts of solids. Of course, solid-handling capability is critical in wastewater applications. It’s also important in stormwater systems where the pumped fluid often hasn’t been through much processing before reaching the check valve.  In both of these situations, rubber check valves offer a great solution. 

The advanced elastomers that make up Proco’s rubber check valves are specifically designed to work in these applications. They allow users to design a system to prevent backflow without the maintenance headaches of other check valves.  Rubber check valves can withstand harsh, erosive fluids without rusting or deteriorating. For example, the elastomers used in the Series 700 ProFlex™ Rubber Check Valves from Proco Products, Inc., are designed for these applications.


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