| 摘要 |
An environmentally advantageous gas exhaust valve to control pressure changes in a container relative to the outside atmosphere, such as release of excessive pressure buildup in a bag as well as the introduction of a vacuum in a bag. A valve includes a valve cap, a diaphragm spring plate with flaps and can also includes a viscous material. A gas exhaust valve according to the invention is especially useful for coffee packages. The valve can also contain a cavity plate having multiple directional cavities and a viscous seal to allow the gas build up to escape, re-seal and thereby control pressure. A relief hole plate layer can also be provided, having a plurality of internal relief holes and a seal/filter layer and a filter seal to prevent the fine particles of the product inside the package from clogging the relief valve and interfering with its functionality and operation. |
