The main features of electric actuators are compact structure, easy operation and maintenance, suitable for common task media such as water, solvent, acid and natural gas, and also for media with harsh task conditions, such as oxygen, hydrogen peroxide, methane and ethylene. In the fully opened condition of the swing check valve, the fluid pressure is almost unhindered, so the pressure drop across the valve is relatively small. The selection details are introduced below:
Electric actuator is selected according to the prevention of backflow of medium
Only allow the media to move in one direction, and prevent the direction from moving,
Electric actuator is selected according to the parameters of the conditioning medium
In the process of consumption, in order to make the media pressure, flow and other parameters meet the requirements of the process flow, the demand device conditioning mechanism stops the adjustment of the above parameters, among which the check valve belongs to this type of valve, which includes a swing check valve And lifting check valve, the valve disc seat of the lifting check valve is located on the valve seat sealing surface on the valve body.The selection of the electric actuator is mainly based on the two aspects of preventing medium backflow and adjusting the medium parameters. The electric actuator is evolved from a plug valve. In order to ensure that the valve disc can reach a suitable position on the valve seat surface each time, the valve disc is designed in a hinge mechanism so that the valve disc has sufficient swing space and the valve disc is truly In one-sided contact with the valve seat, the swing check valve has a hinge mechanism, and a valve flap like a door rests freely on the surface of the inclined valve seat.
Usually this kind of electric actuator is an automatic task. Under the action of fluid pressure moving in one direction, the valve flap opens; when the fluid moves in the opposite direction, the pressure of the fluid and the self-reclosing valve flap of the valve act on the valve seat, thereby cutting off The main task principle of the adjustment mechanism is to change the flow area between the valve disc and the valve disc and the valve seat to achieve the purpose of adjusting the above parameters. The valve disc can be made entirely of metal or can be inlaid with leather on the metal , Rubber, and perhaps the decomposition cover, which depends on the requirements of the function. These valves are collectively called control valves, which are divided into self-driven control valves such as pressure reducing valves and pressure regulators, which are driven by the medium's own power. Valves, etc., those that are preemptively driven are called other-drive control valves, such as electric conditioning valves, pneumatic conditioning valves, and hydraulic conditioning valves. This valve seems to be the same as a shut-off valve except that the valve flap can be lifted and lowered freely. The fluid pressure causes the valve disc to lift from the sealing surface of the valve seat, and the backflow of the medium causes the valve disc to fall back to the valve seat and cut off the activity.