A pressure and vacuum relief valve is used for venting a plant section and protect it from impermissible pressure loads.
The diaphragm Diaphragm A diaphragm is a thin layer of material, which has a large surface area. valve version uses a diaphragm as a closing element, which is pressed onto the valve seats. The diaphragm can be loaded with weights or liquid in order to set a set pressure Set pressure Set pressure is the gauge pressure at the device inlet at which the relief device is set to start opening under service conditions. .