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Gate Valve-IS 778
Size : 8mm to 100mm
Scope
A valve through which the flow of fluid is controlled by means of a gate in the form of a wedge or disc between the body ends which are in line with each other; the gate is actuated by a stem whose axis is at right angles to that of the body ends. In the gate valves, the fluid pressure acts on one side of the gate and there is no change in the direction of flow.
This standard covers requirements of copper alloy gate, globe and check valves of nominal sizes 8 to 100 mm suitable for working temperatures up to 45 SoC and non-shock working pressure up to 1·6 MPa, for waterworks purposes
Usage
Cu-Alloy Gate Valves are primarily used in marine applications, desalination plants, offshore platforms, and chemical industries due to their excellent resistance to corrosion, especially in saline and aggressive environments. Made from copper-based alloys like bronze or gunmetal, these valves offer durability, low maintenance, and reliable sealing in harsh operating conditions. Their robust construction makes them ideal for controlling the flow
of seawater, brine, and other corrosive fluids in pipelines whereconventional materials may fail.
Material Table & Components
| Sl. No. | Component | Material | Conforming to |
|---|---|---|---|
| i) | Body |
a) Brass b) Leaded tin bronze |
DCB 2 of IS: 1264-19811 LTB 2 of IS: 318-19812 |
| ii) | Bonnet or cover |
a) Leaded tin bronze b) Forged brass c) Brass |
do CuZn2Pb2 of IS: 3488-19803 DCB 2 of IS: 1264-19811 |
| iii) |
Stuffing box, disc hinge, check nut, stem nut, disc retaining nut, gland, gland nut, gland flange |
a) Leaded tin bronze b) Extruded brass rod c) Forged brass |
LTB 2 of IS: 318-19812 Type I or Type II (Half hard) of IS: 319-19744 CuZn2Pb2 of IS: 3488-19803 |
| iv) | Stem, hinge pin and plug |
a) Extruded brass rod b) High-tensile brass c) Forged brass |
Type II (Half hard) of IS: 319-19744 HT 1 or HT 2 of IS: 320-19808 FHTB 1 and FHTB 2 of IS: 6912-19736 CuZn2Pb2 of IS: 3488-19803 |
| v) | Ball (for ball type check valves) | Chromium steel | IS: 4398-19727 |
| vi) | Bolts, nuts | Mild steel | Property clauses 4.6 and 4 of IS: 1367-19678 |
| vii) | Handwheel | Cast iron | FG 200 of IS: 210-19789 |
| viii) | Gasket | Compressed asbestos fibre | Grade C of IS: 2712-197110 |
| ix) | Gland packing |
a) Hemp and jute b) Asbestos |
IS: 5414-196911 IS: 4687-198012 |
| x) | Spring | Phosphor bronze wire | IS: 7608-197513 |
| xi) | Seating ring | Synthetic rubber | IS: 5192-197514 |