... -close /locking valve, safety indicator valve. 2, open and shut the pot free of push,easy and simple to handle. 3 ... , pressure-limiting valve,setting pressure accutately and safely,even upon the limited pressure. 5, high security's stuck -preventing cap is reliable ... imported high-quality 18-8stainless steel and alloy aluminum reunite the bottom, imported high-quality 18-8stainless steel body and cover ...