The BSA and A3S isolation valves are engineered to maintain plant safety and save energy by eliminating stem seal leaks. The valves can help oil, gas, petrochemical, pharmaceutical, food and beverage facilities reduce energy use and ensure operator and plant safety. The isolation solution includes a throttling plug that allows manual regulation to adjust line pressure and flow. It can also be used as a basic control valve or a substitute for bypass lines. The high integrity A3S bellows sealed valve is suitable for use under higher pressure steam, gas and liquid applications because it is designed to ASME Class 800.