Page 57 - 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™
In-Line Rubber Check Valves
The specified Back Pressure forces the ProFlex In-Line
Rubber Check Valve to close preventing backflow.
The specified Inlet Pressure opens the
ProFlexIn-Line Rubber Check Valve allowing flow.
1. Does the ProFlex In-Line Rubber Check Valve have to be installed in a
certain position?
The ProFlexIn-Line Rubber Check Valve can be installed in any position although it is
suggested that if installed in a horizontal plane, the bill should be vertical to the plane.
2. In which degree can the ProFlex In-Line Rubber Check Valve be installed?
Because the valve is not reliant on any hinges, gates, or weights the ProFlexIn-Line
Rubber Check Valve can be installed in any angle from vertical to horizontal.
3. What is “Back Pressure”?
When the ProFlexIn-Line Rubber 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 cracking pressure to allow the valve to open?
Required head pressure will be slightly higher on the in-line valve due their shape.
5. What back pressures can the ProFlex In-Line 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 ProFlexIn-Line Rubber Check
Valve is manufactured to the exact line pressure, back pressure and flow rates which
we require from you for manufacture.
6. What are the most common installations?
The ProFlex720 In-Line Flanged Rubber Check Valve is bolted between two pipe
flanges replacing typical internal swing type check valves, the ProFlex740 In-Line Slip-
In Rubber Check Valves are clamped internally utilizing a stainless steel expanding
clamp. The in-line valves are commonly used as pump protection and can be used in
vacuum applications.
7. Can I use the ProFlex In-Line Rubber Check Valve on potable water applications?
The standard material for the ProFlexIn-Line Rubber Check Valve is NSF61 approved
Nitrile. Due to the large demand for clean water and potable applications, PROCO will
be the leader in supplying NSF61 as its check valve material of choice. This will
eliminate the concerns commonly affiliated with contaminants or leaching of
elastomers in potable water systems.
8. Can the ProFlex In-Line Rubber Check Valve be installed on an “out-of-round” pipe?
Yes, the 740 Slip-In Style is especially suited for out-of-round or badly worn pipe as
the expandable clamp applies pressure to the I.D. of the check valve forcing complete
sealing against the pipe I.D.
9. Can the ProFlex In-Line Rubber Check Valves be used to create back pressure?
Due to their designs, the 720 and 740 ProFlexIn-Line Rubber Check Valves will
inevitably create back pressure. The valves have been designed to fit inside an existing
pipe, therefore the nominal pipe I.D. has been reduced by at least one pipe diameter
creating higher head loss and higher inlet pressure to open the valve.
10. Can PROCO make a special design to suit my requirements?
In most instances the ProFlex In-Line Rubber Check Valve can be fabricated to suit
different applications. Contact PROCO for your requirements.
11. What types of elastomer are available?
The ProFlexIn-Line Rubber Check Valve can be manufactured and supplied to
withstand almost any type of media. Most commonly supplied are Nitrile (NSF61
approved), Neoprene, Gum Rubber, Hypalon®, Chlorobutyl, EPDM, and Viton®.
12. What types of materials are available for the internal clamps?
The ProFlexIn-Line Slip-In Rubber Check Valves (Style 740) are supplied with 316
stainless steel internal expanding clamps. Other materials are available upon request.
The In-Line Flanged Rubber Check Valve (Style 720) does not require a backing ring as
it is installed between mating pipe flanges. A gasket is not required as the Style 720
creates its own sealing face.
13. Can the ProFlex 720 In-Line Flanged Rubber Check Valve 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, and
square flanges are available upon special request.
14. Can I install a ProFlex In-Line Rubber Check Valve near a residential area?
Yes, one of the unique features of the ProFlexIn-Line 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 bill will close and not allow children or animals to crawl inside
when there is no head pressure.
15. Can the ProFlex In-Line Rubber Check Valve be used to prevent the common
problem often affiliated with manhole flooding?
Yes. The ProFlexIn-Line Rubber Check Valve is uniquely designed to fit directly inside
a manhole which will prevent reverse flow from flooded manholes.
16. Can I use a ProFlex In-Line Rubber Check Valve in winter conditions?
Yes, as in any installation the ProFlexIn-Line 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 elastomers’
unique chemical makeup.
17. What is the maximum temperature that the ProFlex In-Line Rubber Check Valve
can handle?
Temperature capabilities can range from –65° F (-54° C) to +250 (+121° C) depending
on the specified elastomer.