Direct answer · Updated August 2026
What is a gunmetal gate valve Class-1?
A gunmetal gate valve Class-1 is an ISI marked IS 778 valve with gunmetal IS 318 LTB-2 body tested to 15 kg/cm2 body pressure and 10 kg/cm2 seat pressure — suited to normal-pressure water, plumbing, and compressed air. Supreme Valves India manufactures Class-1 gunmetal gate valves 15–100 mm with BSP screwed ends from Ahmedabad.
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Gunmetal Gate Valve Class-1 Manufacturer India
ISI · IS:778 Class-1 · Body 15 kg/cm2 · Seat 10 kg/cm2
ISI marked gunmetal gate valve Class-1 for potable water, plumbing, fire lines, and general air service. Cast gunmetal IS 318 LTB-2 body and wedge, high tensile brass stem, cast iron hand wheel, BSP screwed female ends, sizes 15 mm to 100 mm. Hydrostatic tested: body 15 kg/cm2, seat and back seat 10 kg/cm2.
Class-1 Test Pressures
| Design standard | IS 778 (ISI marked) |
| Pressure class | Class-1 |
| Body hydrostatic test | 1.5 MPa (15 kg/cm2) |
| Seat / back seat test | 1.0 MPa (10 kg/cm2) |
| Body & wedge | Gunmetal IS 318 LTB-2 |
| Ends | Screwed female BSP |
| Size range | 15 mm to 100 mm (1/2 inch to 4 inch) |
Need higher pressure? See Gunmetal Gate Valve Class-2 or the full gunmetal gate valve range.
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Frequently Asked Questions
When should I specify Class-1 instead of Class-2?
Class-1 is sufficient for normal water supply, plumbing, HVAC, and low-pressure compressed air where working pressure is well below 10 kg/cm2. Class-2 is for higher-pressure lines.
Is Class-1 suitable for drinking water?
Yes. Gunmetal (IS 318 LTB-2) resists corrosion and is widely used for potable water isolation.
What documentation is supplied?
ISI marking certificate, material/test certificate, and hydrostatic test report with each dispatch.