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AVK SILENT CHECK VALVE, PN25

Metal seated, flanged, EN1092, 304 trim/disc, 250µm blue EP coating

Flanged silent check valve for water, and water with glycol from -10°C to 110°C

Series 903 metal seated silent check valves are designed to prevent back flow in high temperature range pumping applications. The valve element movement is controlled via a central guide where a centrally mounted spring together with the short movement aids the quick closing that is essential in reducing shock associated with valve closure. The pumped media can be water, glycol or other clean, neutral liquids.

Variant 903/20-002
Connection: Flanged
Material: Ductile iron
DN: DN65 - DN400
PN: PN 25

Features

  • The combination of light disc, short stroke distance and fast closing spring design effectively mitigates slamming
  • Streamlined contour for low head loss
  • The special metal seat design ensures quick and easy trim replacement
  • Disc in cast, stainless steel 1.4308/CF8 (304), trim in AISI 304
  • 250µm blue RAL 5017 fusion bonded epoxy coating on both external and internal surfaces
  • On sizes DN200 and below the design allows for installation of a butterfly valve at the outlet without additional adapters; cf. measure reference C

Reference nos. and dimensions:

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AVK ref. no. DN
mm		 Flange
drilling		 L
mm		 W
mm		 C
mm		 Theoretical
weight/kg
903-065-20-71000 65 PN25 140 185 27.5 8.0
903-080-20-71000 80 PN25 152 200 35.5 9.0
903-100-20-71000 100 PN25 184 235 46 15
903-125-20-71000 125 PN25 216 270 51 21
903-150-20-71000 150 PN25 248 300 61 31
903-200-20-71000 200 PN25 317 360 84 51
903-250-20-71000 250 PN25 394 440 118 77
903-300-20-71000 300 PN25 362 500 16 97
903-350-20-71000 350 PN25 400 580 35.5 137
903-400-20-71000 400 PN25 448 635 50 178
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Components

1. O-ring EPDM rubber
2. Body Ductile iron GJS-500-7 (GGG-50)
3. Seat Stainless steel 1.4308 (CF8), cast
4. Disc Stainless steel 1.4308 (CF8), cast
5. Spring Stainless steel 1.4301
6. Bush Stainless steel AISI 316
7. Bolt Stainless steel A2
8. Retainer ball Stainless steel AISI 304
9. Bolt Stainless steel A4
10. Face ring Stainless steel 1.4308 (CF8), cast
11. Stem guide Ductile iron GJS-500-7 (GGG-50)
12. O-ring EPDM rubber

Test/Approvals

  • Experimental shell design strength according to EN12516-3
  • Test according to EN12266 |
  • Min. open pressure 0.7 bar

Standards

  • EN 12334
  • Face-to-face dimension according to MSS SP-125 short globe
  • Flange drilling EN1092, PN25
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