Cast Steel Globe Valves

‌Cast steel globe valve‌ is a forced sealing valve with ‌cast steel (such as WCB carbon steel, stainless steel or alloy steel) as the main material. The valve disc is driven by the vertical lifting of the valve stem to achieve full opening or full closing of the fluid. Its typical features include ‌flange/threaded connection‌, ‌straight-through or angle structure‌, and high temperature and high pressure adaptability (up to 425℃, pressure level covers PN16~PN420).

‌Production Standard‌

‌Design Specification‌: Comply with ASME B16.34 (American Standard), GB/T 12235 (National Standard), EN 12516 (European Standard), etc. The material selection must meet the material standards of ASTM A216 (carbon steel), A351 CF8M (stainless steel), etc.; ‌

Process Requirements‌: The valve body is integrally cast, the valve disc sealing surface is welded with hard alloy (such as Stellite 6), and the valve stem is tempered and nitrided on the surface to improve corrosion resistance.

Testing standards‌
‌Sealing test‌: High-pressure air tightness test according to API 598 or EN 12266-1/2, leakage rate ≤ 0.01%×DN15; ‌

Pressure cycle test‌: Verify the valve's 10,000 opening and closing durability at PN100 pressure according to ISO 5208; ‌

Temperature resistance verification‌: High-temperature valves must pass the high-temperature creep test in Appendix B of ASME B16.34.

 

Cast steel globe valves

 

Application and Problem Solving‌
‌ Oil and Gas‌

• ‌Scenario‌: Emergency high-pressure cutoff of oil and gas pipelines; ‌
• Problem Solving‌: Prevent leakage of sulfur-containing media and reduce the risk of pipeline burst.

‌ Chemical and Electric Power‌

• ‌Scenario‌: High-temperature steam pipeline network, boiler water supply system; ‌
• Problem Solving‌: Accurately adjust the flow and isolate corrosive media (such as weak acid, alkali solution) to avoid system pollution.

‌ Ship and Marine Engineering‌

• ‌Scenario‌: Ship fuel, lubricating oil pipelines and seawater cooling systems; ‌
• Problem Solving‌: Tolerate salt spray corrosion and high-frequency vibration environment to ensure navigation safety.

‌ Water Treatment and Metallurgy‌

• ‌Scenario‌: Circulating water system, molten salt flow control; ‌
• Problem Solving‌: Resist erosion and wear of particle-containing media to extend equipment life.

Differences from other globe valves ‌
 ‌Compared with stainless steel globe valves ‌

• ‌Cast steel ‌: Lower cost, better pressure resistance (applicable to PN160~PN420), but weaker than stainless steel in strong corrosion resistance; ‌Stainless steel ‌: Outstanding acid and alkali corrosion resistance (such as 316L material), but easy to deform under high pressure conditions, mostly used in food and pharmaceutical sanitary scenes. ‌

 Compared with cast iron globe valves ‌

• ‌Cast steel ‌: Higher strength and toughness (tensile strength ≥485MPa), supports high temperature and high pressure, and is 30%~40% lighter than cast iron; ‌
• Cast iron ‌: Low cost but low pressure limit (usually ≤PN40), brittle and easy to crack, only suitable for low-pressure water systems. ‌ ‌

 Comparison with chrome-molybdenum steel globe valve‌

• ‌Cast steel‌: The upper temperature limit of conventional models is 425℃, while chrome-molybdenum steel (such as WC6) valves can withstand 650℃, suitable for ultra-high temperature power station systems; ‌
• Chrome-molybdenum steel‌: Additional heat treatment process is required, and the manufacturing cost is 40%~60% higher.

Hot Tags: cast steel globe valves, China cast steel globe valves manufacturers, suppliers, factory, Globe Valve, stainless globe valve, on off globe valve, valve cast iron, 3 way globe control valve, din stainless steel globe valve