Excess Flow Valves (EFV) for gas-stop systems is generally used in natural gas pipelines to prevent possible damages or destruction due to gas leakage. It can be used in a wide operating range of pressure. but the shut-off flow rate could be in various values at different pressures since natural gas can easily be compressed and can reach higher density. In this study. https://www.diegojavierfares.com/hot-price-U-S-POLO-ASSN-Blue-Cotton-Men-Sweater-p18350-great-buy/