DUAL PLATE CHECK VALVES
WATER TECHNOLOGIES – IN HOUSE MANUFACTURING
Dual plate, spring loaded, wafer style design for the protection of gas or liquid piping systems
Water treatment and supply.
Networks for clean water distribution, irrigation (filtered water).
Fire protection networks.
Applications with different fluids (to be consulted).
Ensuring the protection of pumps against flow inversion.
RANGE: DN 40 TO DN 1400
Design: EN16767(EN12516-1) / API594 (ASME B16.34)
Connections: Wafer or Flanged PN6 to PN100 ACC. to EN1092-1 /PN6 to PN40 ISO7005-1 / BS 4504 sect 3.2 ANSI 125# to 600# ACC. to ASME B16.1/ B16.5 / B16.47 (JIS5/10K)
Face to Face: EN588 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 Bars.
Marking: EN-19 / ASME B16.34 (MSS Sp25).
Materials: Ductile Iron, Steel, Stainless steel, superduplex,brz-alu.
Short Face To Face connection with good hydraulic performance.
Low pressure drop.
Seal vulcanized on the seat of the body.
Springs helping closing the plates (reducing waterhammer).
Two springs for equilibrated forces on the plates.
Stops on plates to reduce friction between ears of plates and shaft.
Symmetrical flow obtained by the centering pin when the plates are fully opened.
Horizontal and Vertical installation in pipeline.
Lifting rings from DN 250.
Ductile Iron, Steel, Stainless steel, superduplex,brz-alu.
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.