A valve is one device that can control the liquids flow or gases flow, even slurries by opening, closing or partially blocking up the mediums. Among the various valves, ball valves and butterfly valves are the very general types. These valves can found in many areas such as households, industries and much more, satisfying all the users' requirements. From the respective of the methods of how they are actuated, the Cast RF Flanged Globe Valves can be operated via hydraulic, pneumatic, manual, solenoid and motor. For household use, the valves are commonly manual, while for commercial applications or power plants for electricity generation use, motor operated valves are more appropriate than pneumatic and hydraulic operations, both of which are expensive. But manual operation is impossible.
Big valves used on big pipe lines require strong torque for on-and-off condition, and with the sizes of valves increase, the valves by pneumatic power will out of vogue. Although a double acting piston actuator can be added in the pneumatic valve, the total cost of deployment increase because the accessories involved cost more. The involvement of pneumatic amplifier and large actuators also increase cost. Nevertheless, use a motor operated valve, the deployment constitutive of a motor that rotates a gear-set will rotate the valve in turn, which is indeed an energy-saving operated method, finally save the cost, comparing with other operation methods.
What we concern is, when the valve stem seal leaks under the system, the motor can be put into a compromising condition and it might be breakdown. By placing the rotor in inside a case that contains the fluid pressure and keeping the electric motor stator isolated outside in this way the problem can be solved. And water hammer or liquid velocity shock can be prevented by the slow-operating solenoid valves.
Not only in the big industrial markets such as power plants utilize the motor operated valves, they are also used in the areas where the automatic control is needed. As far as the refrigerators are concerned, in which the motor operated valve is used, because they require a control over the amount of refrigerant to flow through the cooling system, or lubricant flow or other fluids should be controlled accurately and precisely. For precise control, the motor operated valves can realize this purpose.