Coliter ® Brass Gas Ball Valve, 1.6MPa, -20–60°C, BSP Threaded
QF3121 Brass Gas Ball Valve – Full-Port Quarter-Turn Shut-Off for Natural Gas, LPG, and Manufactured Gas Systems
The Coliter® QF3121 Brass Gas Ball Valve is a robust quarter-turn ball valve designed for dependable on/off control in natural gas, manufactured gas, and liquefied petroleum gas (LPG) piping systems. Featuring a forged brass body and full-port design, it ensures unrestricted flow with minimal pressure loss when fully open. The valve utilizes PTFE seals for long-lasting, leak-tight performance and complies with relevant national gas valve safety standards. Rated for a nominal pressure of 1.6 MPa and operating temperatures from -20°C to 60°C, it is suitable for residential, commercial, and light industrial applications. Threaded ends conform to ISO 228 (BSP parallel), available in sizes DN15 (G1/2"), DN20 (G3/4"), DN25 (G1"), DN32 (G1¼), DN40 (G1½), and DN50 (G2"). Its ergonomic handle includes a clear open/close indicator for safe and intuitive operation.
Installation diagram
Product Description
| DN | G | D | L | H | A |
| 15 | G1/2" | 14 | 52 | 44 | 85 |
| 20 | G3/4" | 19 | 64 | 47 | 85 |
| 25 | G1" | 23 | 71 | 59 | 106 |
| 32 | G1¼ | 30 | 82 | 64 | 106 |
| 40 | G1½ | 35 | 101 | 70 | 119 |
| 50 | G2" | 45 | 114 | 83 | 147 |
Technical Specifications
Nominal Pressure: 1.6MPa
Working Medium: Natural Gas, Manufactured Gas, Liquefied Petroleum Gas (LPG)
Working Temperature: -20℃ ≤ t ≤ 60℃
Pipe Threads: ISO 228
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Faq - Frequent questions
Introduction to Gas Ball Valve
Coliter®’s gas ball valves are engineered for reliable, leak-tight shut-off in natural gas and LPG piping systems. The series includes standard models like QF3128 and QF3122, as well as lockable variants (QF5121A, QF5122) with integrated padlock or key-lock mechanisms to prevent unauthorized operation—ideal for utility, residential, and commercial gas lines. All valves feature high-quality forged brass bodies, PTFE seals for long-term tightness, full-port design for unrestricted flow, and compliance with national gas valve standards. Rated for working pressures of 0.1–0.5 MPa and temperatures from -20°C to +60°C, they ensure safe, durable performance with quarter-turn operation and clear open/close indicators.
