| 01 | Ball valves for oil and gas service | Ball, stem, or seat-contact surfaces | Carbon steel, alloy steel, or stainless steel | 25–100 μm for engineering hard chrome | Approximately 800–1,100 HV | Reduces sliding wear, galling, and metal-to-metal scoring | API 6D, ISO 5208, ASTM B650, coating-thickness inspection |
| 02 | Gate valves for process pipelines | Stem and rising-stem contact areas | Carbon steel or precipitation-hardening stainless steel | 25–75 μm | Approximately 800–1,000 HV | Improves stem durability and lowers operating friction | API 600, API 602, ISO 5208, dimensional and adhesion checks |
| 03 | Plug valves for abrasive or dirty media | Plug sealing surface and stem | Alloy steel or stainless steel | 50–150 μm | Approximately 850–1,100 HV | Resists particle erosion and repeated rotational contact | API 6D, API 599, ASTM B650, surface-finish measurement |
| 04 | Butterfly valves for water systems | Disc edge, shaft, or shaft-bushing surfaces | Ductile iron, carbon steel, or stainless steel | 25–75 μm | Approximately 750–1,000 HV | Improves resistance to abrasion and humid-service corrosion | AWWA C504, ISO 5208, ASTM B117 where specified |
| 05 | Check valves for fluid-transfer lines | Hinge pin, disc guide, or piston surface | Carbon steel, alloy steel, or stainless steel | 25–100 μm | Approximately 800–1,050 HV | Limits impact wear and fretting at moving interfaces | API 594, API 6D, ISO 5208, wear and functional testing |
| 06 | Globe valves for throttling service | Stem, plug, and guide surfaces | Carbon steel, alloy steel, or stainless steel | 50–150 μm | Approximately 850–1,100 HV | Supports repeated cycling under high contact pressure | API 623, ASME B16.34, ASTM B650, cycle testing |
| 07 | Hydraulic control valves | Spool, piston, or actuator rod | Hardened carbon steel or alloy steel | 25–50 μm | Approximately 800–1,050 HV | Enhances dimensional stability and seal-contact life | ISO 9001 process control, ASTM B650, roughness and thickness testing |
| 08 | Steam and power-generation valves | Stem, guide, and high-temperature contact surfaces | Chromium-molybdenum steel or stainless steel | 25–75 μm, subject to temperature limits | Approximately 800–1,000 HV | Reduces stem wear and helps protect against oxidation during service | ASME B16.34, API 623, ASTM B650, temperature and pressure testing |
| 09 | Chemical-process diaphragm valves | Actuator stem or non-wetted operating parts | Stainless steel or nickel-alloy steel | 25–50 μm | Approximately 750–950 HV | Adds surface hardness while keeping aggressive chemicals away from the substrate | ASME B16.34, ISO 5208, chemical-compatibility review |
| 10 | Mining and slurry-service valves | Stem, shaft, plug, or replaceable wear surface | Alloy steel, stainless steel, or ductile iron | 50–200 μm | Approximately 850–1,100 HV | Improves resistance to abrasive slurry, impact, and corrosive moisture | ISO 5208, ASTM B650, ASTM B117 where applicable, abrasion testing |