Page 53 - ExpansionJointsCatalog2010

REPRESENTED BY:
PROCO PRODUCTS, INC.
2431 North Wigwam Dr. (95205)
P.O. Box 590 • Stockton, CA
95201-0590 • USA
TOLL-FREE PHONE: (800) 344-3246 NATIONWIDE AND CANADA
FACSIMILE: (209) 943-0242
(209) 943-6088 INTERNATIONAL
email: sales@procoproducts.com
website: http://www.procoproducts.com
FAQs Frequently Asked Questions
to help you understand the
ProFlex Rubber Check Valves
1. Does the ProFlex Rubber Check Valve have to be installed in a certain position?
Yes. It should be installed in a vertical position with the bill being the vertical. However,
in zero-clearance situations the valve can be rotated up to 30° to gain bottom
clearance if required.
2. Is there a preferable angle in which the ProFlex Rubber Check Valve has
to be installed?
Because the valve is not reliant on any hinges, gates, or weights the ProFlexRubber
Check Valve can be installed in any angle from vertical to horizontal.
3. What is “Back Pressure”?
When the ProFlexRubber Check Valve is submerged in a liquid it is subjected to
external pressure. It is critical that the maximum depth that the valve will be
submerged is specified as this will be considered the maximum back pressure to
which the valve will be subjected.
4. What is the required inlet pressure to allow the valve to open?
Typically 1" to 2" of water column over back pressure will normally drain a pipe.
5. What back pressures can the ProFlex Rubber Check Valve withstand?
Back pressures are in direct relation to the size of the valve, on the smaller diameters it
is acceptable to specify up to 200 psi of back pressure and on larger diameters a back
pressure limitation would be approximately 12 psi. Each ProFlexRubber Check Valve
is manufactured to the exact inlet pressure, back pressure and flow rates which we
require from you for manufacture.
6. What are the most common installations?
The ProFlex710 Flanged Rubber Check Valve is bolted directly to a head wall replacing
an existing flap gate. The ProFlex730 Sleeved Rubber Check Valve is clamped directly
to a fabricated flanged nipple or clamped directly to an existing pipe.
7. Can I use the ProFlex Rubber Check Valve on potable water applications?
Yes. One of the optional materials for the ProFlexRubber Check Valves is the NSF61
approved Nitrile elastomer. Due to the large demand for clean water and potable
applications, PROCO is the leading supplier of NSF61 approved material. This will
eliminate the concerns commonly affiliated with contaminants or leaching of
elastomers in potable water systems.
8. Can the ProFlex Rubber Check Valve be installed on an “out-of-round” pipe?
Yes, please have the approximate outside dimensions of the pipe from four (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 ProFlexRubber
Check Valves, but if currents or waves in question are of an abnormal nature, it is
suggested that side walls or rock pilings be utilized.
10. Can the ProFlex Rubber Check Valve be used as a back pressure valve?
No, the ProFlexRubber Check Valves have been designed to offer superior service as a
back flow preventer and should not be considered for a back pressure valve.
11. Can PROCO make a special design to suit my requirements?
In most instances the ProFlexRubber Check Valve can be fabricated to suit different
applications. Contact PROCO for your requirements.
12. What types of elastomers are available?
The ProFlexRubber Check Valve can be manufactured and supplied to withstand
almost any type of media. Most commonly supplied are Nitrile (NSF61 approved),
Neoprene, Natural Rubber, Hypalon®, Chlorobutyl, EPDM, and Viton®.
13. What types of materials are available for the retaining rings and
banding clamps?
ProFlexRubber Check Valves are supplied with 316 stainless steel retaining rings and
304 stainless steel clamps as standard. Other materials are available upon request.
14. Can the ProFlex 710 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 ProFlex Rubber Check Valve near a residential area?
Yes, one of the unique features of the ProFlexRubber Check Valve is the design of the
bill section. While the bill will open and allow passage of fluid when inlet pressure is
present, the bill will close and not allow children or animals to crawl inside when there
is no inlet pressure. And since the ProFlexRubber Check Valve is manufactured
entirely of rubber compounds there is no chance of loud banging which is commonly
heard from flap type valves.
16. Can I use a ProFlex Rubber Check Valve in winter conditions?
Yes, as in any installation the ProFlexRubber 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 elastomers’ unique chemical
makeup. If unusual circumstances occur the ProFlex Rubber Check Valve will freeze
without any damage and will return to operation upon thaw.
17. Will the ProFlex Rubber Check Valve operate if buried in sand or sediment?
In normal conditions the discharge flow will create a small flow pattern which will then
be followed by the flow velocity of the media. This velocity will flush the rest of the
sediment away from the valve’s opening.
18. What is the maximum temperature that the ProFlex Rubber Check Valve
can handle?
Temperatures can range from –65° F (-54° C) to +250° F (+121° C) depending on the
specified elastomer.
19. Is the ProFlex Rubber Check Valve suitable for direct sunlight and UV areas?
Yes, all ProFlexRubber Check Valves are manufactured with a highly UV-resistant
elastomer cover. In some applications the ProFlexRubber Check Valve may be
subjected to oil sludges which make Nitrile the perfect choice for protection.
The specified Back
Pressure forces
the ProFlex
Rubber Check
Valve to close
preventing
backflow.
The specified Inlet
Pressure opens the
ProFlexRubber
Check Valve
allowing flow.