The main features of the electric valve actuator are compact structure, easy operation and maintenance, suitable for common task media such as water, solvent, acid and natural gas, as well as medium with harsh operating conditions such as oxygen, hydrogen peroxide, methane and ethylene. When the swing check valve is fully opened, the fluid pressure is unimpeded, so the pressure drop across the valve is relatively small. The details of the selection are detailed below:
Electric valve actuators are designed to prevent backflow of media
Only allow the media to move in one direction and prevent the direction from moving.
Electric valve actuators are selected according to conditioning media parameters
In the consumption process, in order to make the pressure, flow and other parameters of the medium meet the requirements of the process flow, the demanding device conditioning mechanism stops the conditioning of the above parameters, wherein the check valve belongs to this type of valve, and includes the swing type check valve. And the lift check valve, the valve flap of the lift check valve is located on the valve seat sealing surface of the valve body, and the selection of the electric actuator mainly considers from the two aspects of preventing the medium backflow and the conditioning medium parameters. The electric actuator is evolved from the plug valve. In order to ensure that the valve flap can reach the proper position of the seat surface every time, the valve flap is designed in the hinge mechanism, so that the valve flap has enough swing space and the valve flap is real. The one-sided contact with the valve seat, the swing-type check valve has a hinge mechanism, and a valve-like valve flap freely rests on the outer surface of the inclined valve seat.
Usually, such an electric valve actuator is an automatic task, and the valve flap is opened under the action of fluid pressure in one direction; when the fluid moves in the opposite direction, the fluid pressure and the self-reclosing valve flap of the valve disc act on the valve seat, thereby cutting off Activity, the main task principle of the conditioning mechanism is to change the flow area between the valve disc and the valve disc and the valve seat, to achieve the purpose of conditioning the above parameters, the valve flap can be made entirely of metal, or can be set on the metal Rubber, perhaps using decomposition masking surface, depending on the requirements of the application of the function, these valves are collectively referred to as control valves, which are divided into self-driven control valves such as pressure reducing valves and voltage regulators that are driven by the medium itself. Valves, etc., where the power drive is called the drive control valve, such as electric control valve, pneumatic conditioning valve and hydraulic regulating valve, etc., this valve can be freely lifted except the valve flap, other parts seem to be the same as the stop valve The fluid pressure causes the valve flap to lift from the valve seat sealing surface, and the medium returning causes the valve flap to fall back to the valve seat and cut off the activity.
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