Patent attributes
A relief valve comprises a valve body, a pallet assembly, a relief pallet seat, a pilot pallet seat and a force element. The valve body has an interior in fluid communication with a container having a container pressure and the valve body having an exterior exposed to an atmosphere. The pallet assembly has a relief pallet having a relief pressure bearing area, a pilot pallet having a pilot pressure bearing area, and a shaft connects the pilot pallet and relief pallet to space the pilot pallet from the relief pallet. The relief pallet seat extends from the valve body towards the interior of the valve body and is configured to seal against the relief pallet to seal the valve body. The pilot pallet seat extending from the valve body and away from the interior of the valve body and is configured to seal against the pilot pallet to form a reservoir between the pilot pallet, the pilot pallet seat and the valve body. The reservoir has an equalization port to provide fluid communication between the valve body and the reservoir.
