DN250-PN16 Wafer Dual Plate Check Valve
DN250-PN16 Wafer Dual Plate Check Valve - Image 2
DN250-PN16 Wafer Dual Plate Check Valve - Image 3

DN250-PN16 Wafer Dual Plate Check Valve

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Description

Technical Data Sheet: DN250-PN16 Wafer Dual Plate Check Valve

Item Specification
Product Name Wafer Dual Plate Check Valve / Wafer Double Door Check Valve
Type/Series General Purpose (e.g., Series equivalent to Pegler V909, Oventrop, Honeywell Impact)
Nominal Diameter DN250 (10 inches)
Nominal Pressure PN16
End Connection Wafer Type Design, designed for installation between PN16 flanges (According to EN 1092-2, ISO 7005-2, or ASME B16.5 Class 150)
Design Structure Dual Plate / Double Door with Spring-Loaded Hinge

Technical Parameters

Parameter Value Remarks
Pressure Rating PN 16 / 16 bar Maximum allowable working pressure
Shell Test Pressure 24 bar Hydrostatic test
Seat Test Pressure 17.6 bar Hydrostatic test
Suitable Media Water, Non-corrosive liquids, HVAC water, Potable water Not suitable for heavily polluted media or strong acids/bases unless specified
Medium Temp. Range -10°C to +110°C (Standard) Dependent on seat material
-29°C to +180°C (Special Seals)
Flow Coefficient (Kv) Approx. 2000 – 2330 m³/h Flow rate at ΔP = 1 bar, fully open
Installation Position Horizontal or Vertical For horizontal lines, hinge pin must be horizontal/vertical; For vertical lines, flow must be upwards
Flow Direction Unidirectional Must match arrow marking on body

Materials of Construction

Component Material Remarks / Alternative
Body Ductile Iron / Cast Iron e.g., EN-GJS-450-10 (GGG40), EN-GJL-250
Discs / Plates Stainless Steel / Coated Ductile Iron Common: SS304, SS316; or Epoxy-coated Ductile Iron
Shaft / Pin Stainless Steel e.g., SS420, SS316
Springs Stainless Steel
Seat / Seal EPDM (Ethylene Propylene Diene Monomer) Standard Option: Suitable for water, wastewater, mild chemicals
NBR (Nitrile Butadiene Rubber) Suitable for oils and fuels
PTFE (Polytetrafluoroethylene) High temperature or corrosive media
Coating Epoxy / Anti-corrosion Paint Standard color: Blue (RAL 5005) or as specified

Face-to-Face & Installation Dimensions (mm)

The face-to-face dimension (L) is critical for correct installation between flanges.

Dimension Value Standard / Reference
Face-to-Face Length (L) 108 mm According to EN 558-1 Series 49 (formerly DIN 3202 K3)
114 mm Alternative dimension depending on manufacturer design
Body Diameter (D) ~328 mm Maximum outer diameter to fit between PN16 DN250 flanges
Reference: Flange Bolt Circle Dia. (K) 355 mm Corresponds to EN 1092-2 PN16 DN250 flange
Reference: Flange Bolt Holes 12 – Ø26 mm Corresponds to EN 1092-2 PN16 DN250 flange
Approx. Weight ~19.5 kg Range varies by manufacturer (approx. 13.8kg – 30kg)

Dimensional Sketch (Reference Only):

text
      _______
  <-->|     |<--  L (Face-to-Face Length)
   |  |_____|  |
   |            |
   |   D (Body Diameter / Max. Width)  |
   |            |
   |____________|
      (Flow ↑)

Applicable Standards

  • Design & Manufacture: EN 16767, API 594, BS 5153, JB/T 8937

  • Face-to-Face: EN 558-1 (Series 49), ISO 5752, DIN 3202 K3

  • Flange Connection: EN 1092-2, ISO 7005-2, ASME B16.5 Class 150 (compatible)

  • Inspection & Testing: EN 12266, API 598, ISO 5208

Key Features & Applications

Key Features:

  • Compact & Lightweight: The wafer design saves space and reduces weight compared to swing check valves.

  • Quick Closing / Non-Slam: Short spring-assisted disc travel minimizes the risk of water hammer and prevents reverse flow effectively.

  • Low Pressure Drop: Streamlined body and disc design offer low resistance to flow.

  • Versatile Installation: Can be installed in both horizontal and vertical pipelines.

Main Applications:

  • Water Supply and Distribution

  • HVAC Systems (Heating, Ventilation, and Air Conditioning)

  • Industrial Cooling Water Circuits

  • Pump Protection (Preventing backflow damage)

Notes:

  • This datasheet is based on general industry specifications. For final installation, please refer to the official datasheet of the specific manufacturer (e.g., Flowserve, Bray, Emerson, KSB).

  • When ordering, please specify the required seat material (EPDM, NBR, PTFE, etc.) based on your media temperature and chemical compatibility.

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