Reduced Bore Ball Valve
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What is a Reduced Bore Ball Valve
In reduced bore ball valves, flow through the valve is one pipe size smaller than the valve's pipe size resulting in flow area becoming lesser than pipe. But the flow discharge remains constant as it is a multiplier factor of flow discharge (Q) is equal to area of flow (A) into velocity (V). A1V1 = A2V2; the velocity increases with reduced area of flow and decreases with increased area of flow.
Reduced Bore Ball Valve Specification
- Body Type: Two Piece / Three Piece / Floating
- Body Material: All Bar Stock & Cast-able Materials
- End Connections: Threaded, Flanged, Socket & Butt Welded
- Bonnet: Standard, Extended & Cryogenic
- Gland Packing: PTFE, Braided PTFE, Grafoil, Vaccum
- Gasket: PTFE, Spiral Grafoil, Glass filled S S
- Shaft: Splined - No transmission loss or dead band Stainless Steel / 17 – 4PH
- Characteristics: On - Off / Approximate throttling with Positioner
- Actuator: Pneumatic Spring Rotary, Fully field reversible
- Supply: Air Pressure 2.0 to 10.0 Bar
- Shut off Class: ANSI VI with Teflon seat, ANSI VI with Metal Seat
Dimension Of Reduced Bore Ball Valve
Design & Testing International Standard:
| Valve Design | BS EN ISO 17292 (BS 5351) / API 6D / ASME B 16.34 / BE EN ISO 12516 |
| Pressure Testing | API 598 / API 6D / BS EN 12266 I |
| Fire Testing | API 607 / BS EN ISO 1266 II |
| Face To Face | As Per ANSI B 16.10 |
| Flange Drilling | ANSI B 16.5, Raised Face, Class 150 / 300 / 600 |
| Screwed End | ANSI B 1.20.1 (BSP/NPT) |
| Socket Weld End | ANSI B 16.11 |
| Butt Weld End | ANSI B 16.25 |
| Quality Assurance | ISO 9001 |
Reduced Bore Ball Valves Material of Construction:
| Body / End Connector Piece: |
| Cast Carbon Steel to ASTM A 216 GR. WCB |
| Stainless Steel to ASTM A 351 GR. CF 8 / 8M / 3 / 3M |
| Hast Alloy B / C |
| ASTM A 351 GR. CN 7M (Alloy 20) |
| Ball: |
| Stainless Steel to ASTM A 351 GR. CF 8 / 8M / 3 / 3M |
| Hast Alloy B / C |
| ASTM A 351 GR. CN 7M (Alloy 20) |
| Stem: |
| AISI 304 (S.S. 304) |
| AISI 316 (S.S. 316) |
| AISI 304L (S.S. 304L) |
| AISI 316L (S.S. 316L) |
| Hast Alloy B / C |
| Alloy 20 |
| Ball Seat / Gland Seal / Stem Seal: |
| P.T.F.E. Virgin |
| P.T.F.E. Glass Filled |
| P.T.F.E. Carbon Filled |
| Grafoil / Graphite Ring |
Diffrence between Reduced Bore Ball Valves and Full Bore Ball Valves
Full bore ball valve is a valve that the hole diameter of its ball is the same size with the pipe size. Reduced bore ball valves is a valve that the hole diameter of its ball is not the same size with the pipe size. In minimum the reduced ball valves ball diameter are one size lower than the pipe size i.e. 4 inch pipe and ball diameter is 3 inch (usually symbolized as 4 x 3 inch ball valves)