Gate Valve Body Structure and Flow Passage

The structure of a gate valve body is determined by its connections to the pipeline and the valve cover. In terms of manufacturing methods, the body can be produced by casting, forging, forged-welding, cast-welding, or pipe plate welding. Forged valve bodies are increasingly being developed towards larger diameters, whereas cast bodies are gradually trending towards smaller diameters. Any gate valve body can be forged or cast, depending on customer requirements and the manufacturer's available production capabilities.The main safety valve product names of China Safety Valve Network include:900 DIN Safety Valve,Air Compressor Safety Valve,A69Y Main Safety Valve,(W Series) Welding Safety Valve,Anti-sulfur Spring Type Safety Valve,ANSI Bellows Safety Valve,Air, Gas ValveAmmonia-used Safety Valve,A28X Air Compressor Safety Valve,AD Safety Valve Muffler,Bellows Spring Fall Lift Safety Valve,Built-in Safety Valve,Butterfly Spring Type Safety Valve,Copper Safety Valve

The flow passage of a gate valve body can be categorized into two types: full-bore type and reduced-bore type. A full-bore type has a flow passage diameter essentially equal to the valve's nominal diameter. A reduced-bore type has a flow passage diameter smaller than the nominal diameter. There are two shapes for reduction: uniform reduction and non-uniform reduction. A conical flow passage is a type of non-uniform reduction. In such valves, the diameter at the inlet end is basically the same as the nominal diameter, then gradually tapers to its minimum at the valve seat.

Using a reduced-bore flow passage (whether conical non-uniform or uniform reduction) offers the advantage of reducing the disc size, opening/closing force, and torque for valves of the same specification. The disadvantage is increased flow resistance, pressure drop, and energy consumption. Therefore, the reduction should not be excessive. For conical reductions, the ratio of the seat inner diameter to the nominal diameter typically ranges between 0.8 and 0.95. For reduced-bore valves with a nominal diameter less than 250mm, the seat inner diameter is generally one nominal size lower. For those with a nominal diameter equal to or greater than 300mm, the seat inner diameter is generally two nominal sizes lower.

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