PTFE Expansion Joints” Rubber Check Valve is a cost-effective way to control back pressures from sewage treatment plants, outfalls, and tidal operations. They are an entirely passive flow device requiring neither maintenance nor any outside sources of power or manual assistance to operate.
The PTFE Expansion Joints Check valves are offered as direct replacements for ineffective and maintenance ridden flap type check valves, commonly known to seize, rust, and bind unwanted positions.
Unlike flap-type valves, the PTFE Expansion Joints rubber check valve will handle large obstructions without jamming or having swing gates binding open.
Specify the PTFE Expansion Joints rubber check valves to provide backflow protection from (1) Sewage slurries, (2) Outfalls to ocean fronts from heavy rainfall activity, (3) Prevention from land erosion due to backflow conditions, (4) Protection from saltwater to freshwater ponds and catch basins and numerous other water-based applications. Our history in the manufacture of rubber piping products dates back to 1930.
Designed to bolt directly to existing flanges or new installations, flanges are drilled 150# standard. Other drilling standards are also available upon request.
All of the PTFE Expansion Joints Rubber Check Valves are available in a various selection of elastomers, including NSF/ANSI 61 certified material and backpressure capabilities to suit most applications.
The PTFE Expansion Joints Rubber Check Valves will not freeze or deform and function solely on the inlet and back pressure present in each application.
Benefits of the PTFE Expansion Joints Rubber Check Valves:
- All rubber construction resists abrasive slurries.
- NSF61 is standard construction.
- Hushed operation with no water hammer.
- Its unique design prevents backflow.
- Negligible maintenance and energy costs.
- Will not warp or freeze.
- The quick interchange with any flap type check valve.
- Available in sizes 1” – 96.”
- Available with unique I.D to suit concrete pipe.
Frequently Asked Questions
1. Does the Expansion Joints rubber check valve have to be installed in a specific position?
3. What is “Back Pressure”?
When the PTFE Expansion Joints rubber check valve is submerged in a liquid, it is subjected to external pressure. Therefore, the maximum depth that the valve will be submerged must be specified. This will be considered the maximum backpressure that the valve will be subjected to.
4. What is the cracking pressure to allow the valve to open?
1” to 2” of the water column over back pressure will generally drain a pipe.
Back pressures are directly related to the size of the valve; on the smaller diameters, it is acceptable to specify up to 200 psi of backpressure. On larger diameters, a back pressure limitation would be approximately 12 psi. Each Expansion Joints rubber check valve is manufactured to the exact line pressure, back pressure, and flow rates that we require from you for manufacture. PTFE Expansion Joints can even supply valves up to 650 PSIG utilizing internal back pressure supports.
6. What are the most common installations?
The PTFE Expansion Joints rubber check valve is bolted directly to a headwall replacing an existing flap gate.
7. Can I use the Expansion Joints rubber check valve on potable water applications?
The Expansion Joints rubber check valves are available with an ANSI/NSF-61certified elastomer. Due to the great demand for clean water and portable applications, this will eliminate the concerns commonly affiliated with contaminants or leaching of elastomers in potable water systems.
8. Can the PTFE Expansion Joints install a rubber check valve on an “out of round” pipe?
Yes, please have the approximate dimensions from 4 different angles to provide proper sizing.
9. Can river currents and ocean waves damage the valves?
In most cases, river currents and ocean waves will not damage the Expansion Joints rubber check valves. Still, if winds or waves in question are of an abnormal nature, it is suggested that sidewalls or rock pilings are utilized.
10. Can the PTFE Expansion Joints rubber check valve be used as a pressure relief valve?
No, the Expansion Joints rubber check valves have been designed to offer superior service as a backflow preventer and should not be considered for a pressure relief valve.
11. Can PTFE Expansion Joints make a special design to suit my requirements?
In most instances, the Expansion Joints rubber check valve can be fabricated to suit different applications.
12. What types of elastomer are available?
The PTFE Expansion Joints rubber check valve can be manufactured and supplied to withstand almost any media type. Most commonly supplied are Nitrile (NSF/ANSI Standard 61 certified), Neoprene, Gum Rubber, Chlorobutyl, and EPDM.
13. What types of materials are available for the backing rings and banding clamps?
14. Can the PTFE Expansion Joints be supplied with special flanges or drilling?
Yes, the standard drilling pattern is ANSI 125/150# drilling; other drilling standards such as ANSI 250/300#, BS-10, DIN NP-10, and DIN NP-16, JIS-5k, and JIS-10K are available upon special request.
15. Can I install a PTFE Expansion Joints rubber check valve near a residential area?
One of the unique features of the Expansion Joints rubber check valve is the design of the bill section. While the bill will open and allow passage of fluid when head pressure is present, the account will close and not allow children or animals to crawl inside when there is no head pressure.
Will the PTFE Expansion Joints rubber check valve operate if buried in sand or sediment?
This velocity will flush the rest of the sediment away from the valve opening.
18. What is the maximum temperature that the PTFE Expansion Joints rubber check valve can handle?
Temperature can range from – 65 Deg to +400 Deg depending on the specified elastomer.