Slanted check valve, type 4020

Type 4020 check valve is a double flanged double eccentric valve with slanted seat for supporting fast opening and closing time. Full tightness is achieved with an elastomer-to-metal design. No lever and counterweight is needed. The valve can be used in water distribution and water treatment applications, in power plants and in several other industries.



Soft sealing non-return valve with slanted seat to DIN EN 12334
Drinking, tap and wastewater up to 50°C
DN200 – 1200, PN10 – 16
Face-to-face length DIN EN 558-1, basic series 14 (DIN 3202, serie F4)

General information

  • Disc geometry with optimum hydraulic flow pattern to ensure low pressure losses
  • Wear-resistant, corrosion-resistant and infiltration-proof sealing seat in the body
  • Seat in the body with micro finished NiCr stainless steel welded overlay
  • Reduced closing and opening time due to slanted seat
  • Flange connection dimensions to EN 1092
  • Body: ductile cast iron GGG40
  • Disc: ductile cast iron GGG40
  • Valve shaft: stainless steel grade 1.4021
  • Shaft bearings: bronze
  • Certificate EN10204 3.1

Corrosion protection

  • Body: inside and outside epoxy coated, coating thickness >250 µm, blue RAL 5010
  • Disc: epoxy coated

Additional information


Operating pressure

PN10, PN16

Flange connection


Top flange


EN 19

Face to face length

EN 558-1/14

Test standard

EN 12266-1


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Datasheets (PDF)

Type 4020 slanted check valve datasheet
Type 4020 slanted check valve manual
Type 4020 slanted check valve tender text