 Chemical/Petrochemical Rubber, PTFE-lined and fabric expansion joints for acid and caustic piping, chemical waste lines and pump connections, rated from -20°F to 400°F. |
 Data Centers Expansion joints and flexible connectors for chilled water loops, pump isolation and cooling distribution, reducing the risk of leaks and unplanned downtime. |
 Food Processing Rubber expansion joints and check valves built to the cleanliness and safety standards food and beverage facilities require. |
 HVAC Rubber, PTFE and ducting expansion joints that absorb thermal movement and reduce vibration and noise in heating and cooling systems. |
 Industrial A full range of expansion joints and check valves backed by one of the largest product inventories in North America. |
 Marine Expansion joints and check valves for fire main, propulsion, ballast and cooling systems, certified by ABS, DNV, Lloyd’s Register and the U.S. Navy. |
 Mining Abrasion and chemical-resistant expansion joints and duckbill check valves for slurry, tailings and acid plant applications. |
 Oil & Gas Expansion joints and check valves for upstream, midstream and downstream piping, including saltwater disposal and sour gas lines. |
 Power Generation Rubber and fabric expansion joints, braided connectors and pipe penetration seals for cooling, boiler and pumping systems across fossil, hydro, nuclear and waste-to-energy plants. |
 Pulp & Paper Durable, non-corrosive expansion joints and check valves built to hold up under the elevated pressures and temperatures of paper manufacturing. |
 Semiconductor PTFE and PTFE-lined expansion joints for ultra-pure water systems, chemical delivery and cleanroom cooling with minimal contamination risk. |
 Steel Expansion joints and ProFlex duckbill check valves for cooling water, descaling and abrasive media handling in steelmaking. |
 Water / Waste Water Self-cleaning duckbill check valves and expansion joints for water collection, treatment and discharge, including sewage transport and sludge handling in harsh conditions. |
Check Valves
Check Valves Manufacturer and Supplier
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 also supplies new and replacement rubber valves that are interchangeable with flap type check valves eliminating seizing, rusting or binding.
These duckbill check valves are designed to work with ultra-quiet operation, do not warp or freeze, prevent standing water and eliminate trapped solids. Proco check valves are approved and in service across stormwater systems, sewage treatment plants, outfalls, tidal pipelines, slurry, process water lines, process water and effluent lines, manholes, vaults and other pre-existing pipeline retrofits.
See the video of how our slope bottomed, low head pressure check valves prevent backflow and eliminate common issues that affect headwall outflows.
FAQ’s
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.
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.
Flanged Rubber Duckbill Check Valve
In-Line Flanged Rubber Duckbill Check Valve
Sleeved Rubber Duckbill Check Valve
Slip-in Style In-Line Rubber Duckbill Check Valve
Expansion Joints
Expansion Joint Manufacturer and Supplier
Proco Products is a leading expansion joint manufacturer with an extensive inventory of expansion joints for piping and ducting systems.
Our movement expansion joints are manufactured to have the ability to protect your equipment against a variety of stressors while also being low maintenance and durable for maximum efficiency.
Proco Products manufactures expansion joints for industrial and commercial installations using pumping, piping or ducting which requires expansion or movement joints to deal with thermal expansion, vibration or ground movement.
See the video of our variety of designs in rubber, stainless steel or polytetrafluoroethylene (PTFE).
Our high-performance expansion joints ensure safe and reliable operations supporting system integrity, mitigating fatigue and reducing maintenance downtime.
FAQ’s
Where are rubber expansion joints used?
Rubber expansion joints are vital in diverse piping systems to absorb thermal movement, isolate vibration, and dampen noise. Common applications include HVAC systems, plumbing, power generation plants, and various industrial processes. They are also crucial in specialized sectors like marine , wastewater treatment , and pulp & paper plants where they protect equipment and ensure system integrity.
How long do rubber expansion joints last?
The lifespan of rubber expansion joints varies significantly, typically ranging from 5 to 20 years, with an average of 7-10 years usual for many industrial uses. Key factors influencing longevity include operating temperature, pressure, chemical compatibility with the media, frequency and magnitude of movement, installation quality, and environmental conditions such as UV exposure. Regular inspection and proper maintenance are crucial for maximizing service life.
What material is a rubber expansion joint made from?
Rubber expansion joints consist of an inner elastomer tube for media contact, a reinforcement carcass, and an outer protective cover. Common elastomers include EPDM, Neoprene, Nitrile, Butyl, and Viton, chosen for chemical and temperature resistance. The carcass uses fabric plies like Nylon, Polyester, or high-strength Aramid for pressure resistance, sometimes with metal rings for vacuum or high pressure. Flanges are typically steel or integral rubber.
What is an EPDM expansion joint and where is it used?
An EPDM expansion joint uses Ethylene Propylene Diene Monomer rubber, valued for its outstanding resistance to ozone, UV radiation, weathering, and heat, making it ideal for outdoor use. It excels in water applications (potable, wastewater, cooling towers) and resists mild chemicals, acids, and alkalis but is not recommended for use with oils and hydrocarbon fuels. Standard temperature limits are typically around 100-130°C.
Can I use a rubber expansion joint in extreme temperature conditions?
Yes, rubber expansion joints can operate in extreme temperatures, subject to selecting the correct elastomer and reinforcement. Temperature capabilities range widely, from around -40°C (-40°F) to over 200°C (392°F) using materials like Viton with Aramid reinforcement. Standard pressure ratings often reach 15-25 bar (approx. 225-362 psi), with higher ratings possible via specialized designs. Note that pressure ratings typically decrease with increasing temperature and larger diameters. Good manufacturers will specify precise limits.
ANSI/NSF 61 Certified Rubber Expansion Joint
Molded spherical rubber expansion joint
Spool-type rubber expansion joint
Convoluted PTFE expansion join
