Pietro Fiorentini Pilot-Operated Gas Pressure Regulator Reval 182 Reval 182 is pilot-controlled pressure regulator for medium and low pressure applications. Reval 182 is normally a fail to close regulator and specifically will close under the following conditions: breakage of main diaphragm and lack of feeding to the pilot loop. This regulator is suitable for use with previously filtered, non-corrosive gases. Available pipe sizes: 1″ to 10″ NPT Read more Request a Quote This product is already in your quote request list. Browse the list