The rotary action of the stem provides a shearing action against the seal, which allows for clean separation of the process during closure. Tight shutoff is a characteristic of control valves, since the stem remains in continual. Improved sealing devices and highly accurate machining of the stem have provided tight shutoff as well as characterizable control. The design of the regulating element, which allows the stem to turn into the flow without any significant side loads.
Rajahmundry, Andhra Pradesh, India
