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A check valve is an automatic valve that allows liquid or gas to flow in one direction and restricts flow in the opposite direction. Also called a non-return valve or one-way valve, it uses pressure and...

TL;DR A stainless steel gate valve is specified from the service, not from the word stainless. The 304 and 316 types (cast CF8 and CF8M) can crack in warm chloride service above about 60 °C (140 °F),...

TL;DR A forged steel gate valve for small-bore piping is normally specified to API 602, whose current eleventh edition covers NPS 1/4 to 4 (DN 8 to 100) in Class 150, 300, 600, 800 and 1500. In the tenth...

The main difference between a plug valve and a ball valve is the closure and sealing arrangement. A plug valve rotates a ported cylindrical, tapered or eccentric plug. A ball valve rotates a bored sphere...

Pneumatic valves control compressed air by directing it, restricting its flow, regulating its pressure or blocking unwanted reverse flow. A directional valve decides which actuator chamber receives air....

Disciplined vetting turns valve procurement from a price comparison into an engineering decision. The manufacturers that consistently ship reliable gate valves, ball valves, and control valve packages...

The right pressure reducing valve manufacturer depends first on the medium. Steam, natural gas and water each have their own valve designs, and few manufacturers are strong in all three. This guide compares...

A globe control valve is the sliding-stem valve most process plants rely on when a loop has to throttle accurately. An actuator moves a contoured plug toward or away from a seat ring, and the changing...

TL;DR A stainless steel butterfly valve is specified part by part: body, disc, stem and seat. A stainless disc in a ductile-iron body and an all-stainless valve are sold under the same name, so the datasheet...

TL;DR A China butterfly valve can be a rubber-lined concentric wafer valve or an API 609 Category B triple-offset valve with a metal seat. Specify from the service conditions: design category, body style,...

TL;DR A ball valve seals by rotating a bored sphere a quarter turn against two seats. Specify it by more than size and class: floating or trunnion support, full, reduced or V-port bore, body construction,...

On a P&ID, a gate valve and a ball valve may both appear as simple isolation points. In service, however, they behave differently. Ball valves are often well suited to fast, repeatable on/off operation...