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Cast iron valve series

What is a Cast Iron Valve?

Cast iron valves are manufactured from grey iron (ASTM A126 Class B) or ductile iron (ASTM A536), offering a cost-effective solution for water, HVAC, fire protection, and general industrial applications. Grey iron valves provide good castability and machinability at low cost but have limited mechanical strength and are typically rated to PN16/Class 125 maximum. Ductile iron valves offer higher strength, impact resistance, and pressure ratings (up to PN40/Class 300), making them suitable for more demanding applications.

Cast iron valve types include gate valves (rising stem and non-rising stem), globe valves, swing check valves, butterfly valves (wafer, lug, flanged), Y-strainers, and foot valves. Common features include resilient seated designs (EPDM/NBR for bubble-tight shut-off), fusion bonded epoxy coating (internal and external for corrosion protection), and flanged connections per EN 1092-2 or ASME B16.1/B16.42.

Key Features

  • Cost-Effective: Economical for water and low-pressure applications
  • Resilient Seated: EPDM/NBR seats for bubble-tight shut-off
  • Fusion Bonded Epoxy: Internal and external corrosion protection
  • Ductile Iron Option: Higher strength and pressure rating
  • Large Diameters: Up to DN2000 for butterfly valves
  • Wide Range: Gate, globe, check, butterfly, strainer, foot valves
iron rising stem gate valves

iron rising stem gate valves

Cast iron non-rising stem gate valves

Cast iron non-rising stem gate valves

cast iron globe valve

cast iron globe valve

screw type check valve

screw type check valve

screw type check valve

screw type check valve

lift check valve

lift check valve

cast iron check valves

cast iron check valves

cast iron ball valve

cast iron ball valve

cast iron filter

cast iron filter

Technical Specifications

ParameterRange
Size RangeDN50 - DN2000 (2" - 80")
Pressure ClassPN10 - PN16 (grey iron), PN10 - PN40 (ductile iron), Class 125 - Class 300
Temperature Range-10°C to +120°C (EPDM), up to +200°C (metal seated)
Body MaterialsGrey iron (ASTM A126 CL B), Ductile iron (ASTM A536 65-45-12)
Disc/GateDuctile iron + EPDM encapsulation (resilient), SS304/SS316
Seat MaterialsEPDM, NBR, PTFE, metal-to-metal
CoatingFusion bonded epoxy (FBE), min 250 micron, RAL 5015 blue
End ConnectionsFlanged (EN 1092-2 PN10/PN16, ASME B16.1 CL125), wafer, lug
Design StandardsEN 593 (butterfly), EN 558 (face-to-face), BS 5163 (gate), MSS SP-70 (gate)
TestingEN 12266-1, API 598, ISO 5208

Industry Applications

  • Water Distribution: Mains, branches, pumping stations — Resilient seated gate, butterfly
  • Fire Protection: Sprinkler mains, hydrant, pump room — OS&Y gate, CI check, butterfly
  • HVAC: Chilled water, condenser water, steam — CI globe, butterfly, strainer
  • Sewage: Raw sewage, treated effluent — Ductile iron gate, knife gate
  • Irrigation: Canals, pump stations, distribution — CI butterfly, gate, check
  • Industrial Water: Cooling water, process water — DI gate, butterfly, strainer

Frequently Asked Questions

Q1: What is the difference between grey iron and ductile iron valves?

Grey iron: economical, brittle, limited to PN16/Class 125, used in building services and water. Ductile iron: higher strength, ductile (can deform before breaking), rated to PN40/Class 300, suitable for more demanding applications including gas and higher-pressure water systems.

Q2: Can cast iron valves be used for gas?

Ductile iron valves with appropriate certifications can be used for low-pressure natural gas distribution (typically up to 4 bar). Grey iron valves are not suitable for gas due to brittleness and risk of fracture.

Q3: What is fusion bonded epoxy coating?

FBE is a thermoset powder coating applied electrostatically and cured at ~200°C. It provides excellent corrosion protection, impact resistance, and adhesion. Minimum thickness is typically 250 microns. It is the standard corrosion protection for buried and water-immersed valves.

Q4: What is a resilient seated gate valve?

A resilient seated gate valve uses a ductile iron gate fully encapsulated in EPDM rubber. When closed, the rubber presses against the body seat to achieve bubble-tight shut-off. This design eliminates metal-to-metal wear and provides reliable sealing in water and wastewater service.

Need a Cast Iron Valve Solution?

Our engineering team can recommend the optimal cast iron valve type, material, and actuator for your specific application. API 6D, SIL, and fire-safe certified.

Email: info@chlgvalve.com Call: +86-15601794339