A stop-check valve, also called as a non-return stop check valve or check valve to stop flow of liquid regardless of flow direction or pressure.

Stop valves (MSVA) are manufactured in angle-way and straight-way types with a Standard neck (MSVA-S). The stop valves are manufactured to give continuous flow characteristics which are easy to repair and dismantle the valve whenever necessary.

The overall purpose of a desuperheater water heater is to provide effective heat transfer between refrigerant and water. Thus results in costly problems to be avoided, including extended shutdown and startup times.