For Ball valve only,as it gives more full bore flow,unlike wedge block,slow operating in Gate valve.
In Full bore ball valve, The bore dia will be same as internal dia of the pipe.In reduced bore, the bore dia is reduced than the ID of pipe.
NB stands for Nominal Bore.
Ball valves are quarter-turn on/off devices. A pivoting ball in the center of the valve controls the flow of liquid or gas media. The pivoting ball is known as a rotary ball, and it is designed with a hole (a bore) in the center. A stem on the top of the ball rotates the ball to open or close the valve. D Chel Valves are the Top Ball Valve Manufacturer in India.
A fast-fill valve in a master cylinder acts as the inlet port and the compensating port. fitted between the reservoir and the cylinder bore. It is a combination valve with a ball and a pressure seal. Depending on the pressure, it allows flid to flow from the large bore of the cylinder to the reservoir, or from the reservoir into the large bore.
A titanium ball valve is a shut off valve that controls the flow of a liquid or gas by means of a rotary ball having a bore. The following are the dimensions given by the titanium ball valves manufacturers: Dimension : API602, ASME B1.20.1, ASME B16.11, ASME B16.5, API598 For more information, visit - Website: rajkrupametal industries
nominal bore
NB is nothing but Nominal Bore.
valves are available in three types first is full bore equal to 100 percent opening normal bore/port equal to 80 percent opening reduced bore equal to 60 percent opening
an inside micrometer
Inside Micrometer
Generally speaking, gate valves in larger sizes are full bore unless you order a reduced port. You would always use a full bore gate valve for hot tapping purposes. or you would use a full bore gate vale for runinig a pig in pipeline.
Use full bore for applications where pressure drop should be minimum (such as in the suction pipe of a pump with required NPSH very close to available NPSH), or for pipes which could be cleaned with a pig (so that the pig doesn't get stuck on the valve). In other applications a reduced bore should be OK.