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The Reducing Union (Fractional Tube) is a critical instrumentation fitting engineered to connect two fractional-sized tubes of different diameters within a single fluid system. This fitting utilizes a high-precision, twin-ferrule compression design on both ends to ensure a leak-proof, torque-free seal that can withstand high pressures and significant thermal cycling. Typically manufactured from 316 stainless steel or other corrosion-resistant alloys, reducing unions provide a smooth transition between varying line sizes without the need for additional adapters or complicated plumbing. They are essential in complex industrial layouts, such as chemical processing plants and laboratory manifolds, where they allow for the efficient reduction of flow lines while maintaining the structural integrity and vibration resistance of the entire tubing network.
| REDUCING UNION | |||||||||
|---|---|---|---|---|---|---|---|---|---|
| Fractional Tube | Dimensions in (mm) | ||||||||
| T-Tube O.D. (in.) | Tx-Tube O.D. (in.) | Basic Ordering Number | L | C | G | F | E | Cx | Gx |
| 1/8 | 1/16 | VRU-SS-2-1 | 1.22(31.0) | 0.50(12.7) | 0.44(11.1) | 0.44(11.1) | 0.05(1.3) | 0.34(8.6) | 0.31(7.9) |
| 3/16 | 1/16 | VRU-SS-3-1 | 1.27(32.3) | 0.54(13.7) | 0.50(12.7) | 0.44(11.1) | 0.05(1.3) | 0.34(8.6) | 0.31(7.9) |
| 3/16 | 1/8 | VRU-SS-3-2 | 1.44(36.6) | 0.54(13.7) | 0.50(12.7) | 0.44(11.1) | 0.09(2.3) | 0.50(12.7) | 0.44(11.1) |
| 1/4 | 1/16 | VRU-SS-4-1 | 1.35(34.3) | 0.60(15.2) | 0.56(14.3) | 0.50(12.7) | 0.05(1.3) | 0.34(8.6) | 0.31(7.9) |
| 1/4 | 1/8 | VRU-SS-4-2 | 1.52(38.6) | 0.60(15.2) | 0.56(14.3) | 0.50(12.7) | 0.09(2.3) | 0.50(12.7) | 0.44(11.1) |
| 1/4 | 3/16 | VRU-SS-4-3 | 1.55(39.4) | 0.60(15.2) | 0.56(14.3) | 0.50(12.7) | 0.12(3.0) | 0.54(13.7) | 0.50(12.7) |
| 5/16 | 1/8 | VRU-SS-5-2 | 1.56(39.6) | 0.64(16.2) | 0.63(15.9) | 0.56(14.3) | 0.09(2.3) | 0.50(12.7) | 0.44(11.1) |
| 5/16 | 1/4 | VRU-SS-5-4 | 1.66(42.2) | 0.64(16.2) | 0.63(15.9) | 0.56(14.3) | 0.19(4.8) | 0.60(15.2) | 0.56(14.3) |
| 3/8 | 1/16 | VRU-SS-6-1 | 1.44(36.6) | 0.66(16.8) | 0.69(17.5) | 0.63(15.9) | 0.05(1.3) | 0.34(8.6) | 0.31(7.9) |
| 3/8 | 1/8 | VRU-SS-6-2 | 1.61(40.9) | 0.66(16.8) | 0.69(17.5) | 0.63(15.9) | 0.09(2.3) | 0.50(12.7) | 0.44(11.1) |
| 3/8 | 1/4 | VRU-SS-6-4 | 1.70(43.2) | 0.66(16.8) | 0.69(17.5) | 0.63(15.9) | 0.19(4.8) | 0.60(15.2) | 0.56(14.3) |
| 3/8 | 5/16 | VRU-SS-6-5 | 1.74(44.2) | 0.66(16.8) | 0.69(17.5) | 0.63(15.9) | 0.25(6.4) | 0.64(16.3) | 0.63(15.9) |
| 1/2 | 1/8 | VRU-SS-8-2 | 1.78(45.2) | 0.90(22.8) | 0.87(22.2) | 0.81(20.6) | 0.09(2.3) | 0.50(12.7) | 0.44(11.1) |
| 1/2 | 1/4 | VRU-SS-8-4 | 1.85(47.0) | 0.90(22.8) | 0.87(22.2) | 0.81(20.6) | 0.19(4.8) | 0.60(15.2) | 0.56(14.3) |
| 1/2 | 3/8 | VRU-SS-8-6 | 1.91(48.5) | 0.90(22.8) | 0.87(22.2) | 0.81(20.6) | 0.28(7.1) | 0.66(16.8) | 0.69(17.5) |
| 5/8 | 3/8 | VRU-SS-10-6 | 1.94(49.3) | 0.96(24.4) | 1.00(25.4) | 0.94(23.9) | 0.28(7.1) | 0.66(16.8) | 0.69(17.5) |
| 5/8 | 1/2 | VRU-SS-10-8 | 2.05(52.1) | 0.96(24.4) | 1.00(25.4) | 0.94(23.9) | 0.41(10.4) | 0.90(22.8) | 0.87(22.2) |
| 3/4 | 1/4 | VRU-SS-12-4 | 1.94(49.3) | 0.96(24.4) | 1.13(28.6) | 1.06(27.0) | 0.19(4.8) | 0.60(15.2) | 0.56(14.3) |
| 3/4 | 3/8 | VRU-SS-12-6 | 2.00(50.8) | 0.96(24.4) | 1.13(28.6) | 1.06(27.0) | 0.28(7.1) | 0.66(16.8) | 0.69(17.5) |
| 3/4 | 1/2 | VRU-SS-12-8 | 2.11(53.6) | 0.96(24.4) | 1.13(28.6) | 1.06(27.0) | 0.41(10.4) | 0.90(22.8) | 0.87(22.2) |
| 3/4 | 5/8 | VRU-SS-12-10 | 2.11(53.6) | 0.96(24.4) | 1.13(28.6) | 1.06(27.0) | 0.50(12.7) | 0.96(24.4) | 1.00(25.4) |
| 1 | 1/2 | VRU-SS-16-8 | 2.38(60.5) | 1.23(31.2) | 1.50(38.1) | 1.37(34.9) | 0.41(10.4) | 0.90(22.8) | 0.87(22.2) |
| 1 | 3/4 | VRU-SS-16-12 | 2.38(60.5) | 1.23(31.2) | 1.50(38.1) | 1.37(34.9) | 0.62(15.7) | 0.96(24.4) | 1.13(28.6) |