Abstract: A pressure relief valve includes a housing including an air passage chamber defining an airflow passage and a membrane flap secured within the air passage chamber. The membrane flap covers the airflow passage in a closed position. A portion of the membrane flap is configured to move off the airflow passage into an open position. A flap motion dampener is proximate to the airflow passage. The flap motion dampener is configured to control motion of the membrane flap as the membrane flap seats over the airflow passage in order to dampen noise.

Abstract: A pressure relief assembly (100) includes a housing (102) including an air passage chamber (104) having a flap barrier (122) surrounding at least one airflow passage. A membrane flap is secured within the air passage chamber. The membrane flap covers the airflow passage(s) in a closed position. A portion of the membrane flap is configured to move off the airflow passage(s) into an open position. A noise-dampening seal (120) formed of a noise-dampening material is proximate to at least a portion of the flap barrier. The noise-dampening seal is configured to reduce noise generated by movement of the membrane flap as the membrane flap moves from the open position to the closed position. The noise-dampening seal provides a sealing interface with the membrane flap in the closed position.

Abstract: A pressure relief valve includes a housing including an air passage chamber defining an airflow passage and a membrane flap secured within the air passage chamber. The membrane flap covers the airflow passage in a closed position. A portion of the membrane flap is configured to move off the airflow passage into an open position. A flap motion dampener is proximate to the airflow passage. The flap motion dampener is configured to control motion of the membrane flap as the membrane flap seats over the airflow passage in order to dampen noise.