Coliter ® Brass Excess Flow Valve (EFV), 0.015MPa, -20–60°C, for Natural Gas and LPG
QF3157 Brass Excess Flow Valve (EFV) – Automatic Gas Shut-Off for Pipeline Rupture or Leak Protection
The Coliter® QF3157 Brass Excess Flow Valve (EFV) is a safety device designed to automatically shut off the gas supply when an abnormal flow rate—caused by pipe rupture, hose disconnection, or major leakage—is detected. Intended for use in natural gas, manufactured gas, and liquefied petroleum gas (LPG) systems, it provides critical protection against fire, explosion, or gas accumulation hazards. The valve remains fully open under normal flow conditions but triggers rapid closure when flow exceeds the preset threshold. Rated for a nominal pressure of 0.015 MPa and operating temperatures from -20°C to 60°C, it features a compact brass body with ISO 228 (BSP parallel) threads (e.g., G1/2" for DN15). Installation is straightforward in horizontal or vertical orientations, making it ideal for residential service lines, appliance inlets, or meter outlets where passive, maintenance-free safety is required.
Installation diagram
Product Description
| DN | G | D | L | B | H | A |
| 15 | G1/2" | 8 | 67.3 | 11.5 | 34 | 40.5 |
Technical Specifications
Nominal Pressure: 0.015MPa
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.
