AXIAL CHECK VALVES
WATER TECHNOLOGIES – IN HOUSE MANUFACTURING
DESIGN FEATURES
Its application on high pressure pumping equipment is not only allowing a better dynamic performance but also a more durable design compared well other conventional check valves.
APPLICATIONS
Pumping stations
Water treatment and supply
Networks for clean water distribution, irrigation (filtered water)
Fire protection networks.
TECHNICAL DATA
RANGE: DN 50 T DN 300
Design: EN16767(EN12516-1)
Connections: Wafer or Flanged PN6 to PN40 ACC. to EN1092-1/PN6 to PN40 ISO7005 BS 4504 sect 3.2 ANSI125# to 150# ACC. to ASME B16.1/ B16.5 / B16.47 (JIS to inquire)
Face to Face: EN558 series 16 / API594
Testing: EN12266(ISO5208) or API598
Maximum working pressures: depending on material construction
Operating temperatures: -20ºC +120ºC (for other temperatures inquire)
Minimum back pressure for tightness: 0,3 to 0,5 bar Marking: EN-19 / ASME B16.34 (MSS Sp25)
TECHNICAL PERFORMANCE
Versatile instalation
Springs loaded disc for better sealing
Reduces Water hammer
Silent
Excellent relation price quality
Available with strainer to use as footvalve
Available with threaded bosses for assembly manometers, controlled evacuation or by-pass.
TEST
Seat: 1,1 x nominal pressure.
Body: 1,5 x nominal pressure
MATERIALS
Alloy steel.
Also available in stainless steel and superduplex. Sizes to be inquired.
VALVES AXIAL – NOZZLE COMPARISON
SPECIAL ALLOYS
Over the years the most frequent used materials on the desalination market have been the so called “Superstainless” or “ superaustenitic”, which anti corrosive properties are superior to austenitic steels.
Due to the price increment on the prime materials and as an alternative more competitive for these materials, Duplex and Superduplex of second generation have been introduced in the market of desalination.
The family of Duplex and Super duplex Stainless steels offer a significant advantage over Standard austinic steels.
The 50/50 ferrite /austenite structure gives improved corrosion and abrasion resistance together with improved tensile and yield properties.
Duplex Composition range is obtained by a complex structure, and therefore requires a much greater degree of technology, melting and process control compared with austenitic stainless steel constructions.
CASTFLOW VALVES S.L. has been experiencing the production of check valves in Duplex stainless steel for the last years, increasing our knowledge on the complex casting technology.
PITTING RESISTANCE EQUIVALENT NUMBER (PREN)
The resistance to pitting of an alloy is of vital importance , particularly so in handling seawater.
Assessment of resistance to pitting is often made by use of a pitting resistance equivalent number which, when this takes account of Cr Mo and N is referred to as a PREn Number.
Calculation is made on the basis of the following.
PREN= %Cr+ 3.3%Mo16%N
