Api 600 Gate Valve

This gate valve wheel is fitted with a malleable iron handwheel, securely held in place by a carbon steel (CS) handwheel nut. The malleable iron material delivers exceptional toughness and impact resistance, supporting steady, effortless manual operation even in high-pressure, large-bore applications and through prolonged, frequent use. The carbon steel nut offers dependable locking performance, effectively preventing loosening during valve cycling and ensuring consistent, precise torque transfer to the stem nut for accurate valve control.

The gate valves for sale stem is made of ASTM A182 F6a martensitic stainless steel, featuring high strength, excellent corrosion resistance and wear resistance. It adapts well to various media (water, oil, steam, etc.) under high-pressure, medium-low temperature and large-bore working conditions. It pairs perfectly with an ASTM A536 80-55-06 ductile iron stem nut, whose high hardness and wear resistance enable efficient torque transmission. With graphite packing and an ASTM A276 410 stainless steel back seat bushing, the stem achieves reliable dynamic sealing, effectively preventing medium leakage and maintaining long-term sealing stability.

The valve's key connection parts (yoke, bonnet, eye) adopt ASTM A193 Gr.B7 alloy steel bolts, paired with ASTM A194 Gr.2H carbon steel nuts. This precisely matched combination is engineered for the high-temperature, high-pressure service conditions of large-bore valves, offering outstanding tensile strength, thermal stability, and fatigue resistance. It can withstand pressure shocks during valve operation, keeping the entire assembly securely fastened and free from deformation or loosening.

The carbon steel gate valve's gland flange and connecting flanges are made of ASTM A216-WCB cast carbon steel, offering excellent pressure-bearing capacity and compatibility. They ensure a tight fit with other valve parts and large-bore pipeline systems. Each flange joint is fitted with a flexible graphite/304 stainless steel composite gasket, combining graphite's superior sealing performance with 304's structural strength. This achieves reliable static sealing, effectively preventing medium leakage at the flange connection under high-pressure conditions..

The cast steel gate valve body and bonnet are produced from ASTM A216-WCB cast carbon steel, a premium and widely applied material with outstanding pressure resistance, impact tolerance, and stable performance under medium-low temperature conditions. It is perfectly suited for large-caliber pipeline systems that transport water, oil, steam and other common industrial media. Both the wedge disc (ASTM A216-WCB+13Cr) and seat (ASTM A105+13Cr) adopt 13Cr stainless steel surfacing on sealing surfaces, greatly improving wear and corrosion resistance of the sealing pair, and delivering tight shut-off as well as extended service life under severe high-pressure, large-size operating scenarios.