Check Valves

What is a check valve?

Flow check valves in pipelines permit liquids and gases to flow one way in a single direction only and prevent the flow reversing. The correct flow pressure forces the check valve open whilst reverse flow causes the valve to close.

Flow check valves open at a designed minimum flow, or cracking pressure, for the valve to begin to operate. Check valves protect systems from pressure surges that may cause damage to pumps and pipework and help efficient operation. Check valve suppliers provide several types of valves, these include ball valves or metal flap check valves in which a disc pivots to prevent reverse flow. Proco Products is a check valve manufacturer specializing in fabricating rubber which has the advantage of not only being durable and effective, but also reduces the likelihood of common maintenance problems seen in metal valves.

Rubber duck bill check valves use a rubber diaphragm which remains closed until fluid or gas flow pressure is applied to open it. Unlike their metal swing or flap check valve counterparts, rubber check valves cannot rust, seize, or bind, typically increasing reliability and longevity. Similarly, rubber check valves do not suffer from mechanical wear, a factor which can negatively influence check valves manufactured from other materials.

Proco Products is a leading manufacturer of rubber check valves, these are  fully passive devices requiring neither maintenance nor any source of outside power or manual assistance to operate. Proco Products is also a rubber check valves supplier offering new and replacement valves that are interchangeable with flap type check valves eliminating seizing, rusting or binding in unwanted positions. Rubber check valves are made to work with ultra-quiet operation, do not warp or freeze and are designed to prevent standing water and eliminate trapped solids.

Proco Products manufactures check valves, industry approved, for water and wastewater, pulp / paper and mining. We supply check valves for use in stormwater applications, sewage treatment plants, outfalls, tidal and pre-existing pipelines such as manholes and vaults.


What is the most reliable check valve?

The elastomeric duckbill valve is known to be the most reliable and cost-effective check valve. The wide array of styles makes them suitable for both clean and dirty water conditions. One of the most beneficial features is the very low head pressures required to operate. Their unique ability to fold/encapsulate the media ensures a proper seal against backflow. Installs range from residential to industrial and commercial locations.

What is the life expectancy of a check valve?

A metal disc valve which pivots on a hinge or trunnion has a life span of 5 to 7 years, compared to 35 -50 years for an elastomeric check valve. Unlike steel bodied check valves, elastomeric rubber check valves require no maintenance or scheduled inspections. The ASTM 5BC520 A14 C12 Eo34 G21 Z1 line call is an elastomer that has been specially engineered to ensure long life expectancy.

Can I use a rubber check valve in winter conditions?

Yes, a rubber check valve will not be hindered by winter or sub-zero installations. If the valve is installed in a running water application the valve will continue to operate satisfactorily, due to the elastomer’s unique chemical makeup. If unusual circumstances occur, the rubber check valve will freeze without any damage and will return to operation upon thaw.

Can a rubber check valve be used as a pressure relief valve?

Rubber check valves can offer superior service as a backflow preventer and can also be considered as a pressure relief valve. They are often used on reservoirs to prevent hydraulic lifting or floating of tanks.