Check valve and regulating valve
(2) Check valve
These valves are used to prevent backflow of the medium, open it by the kinetic energy of the fluid itself, and automatically shut down in the reverse flow. Standing at the outlet of the pump, the steam trap outlet, and other places where fluid flow is not allowed. The check valve is divided into three types: swing type, lift type and clip type. For swing-type check valves, when the fluid can only flow from left to right, it automatically closes when flowing in the reverse direction. For the lift check valve, when the fluid flows from left to right, the spool rises to form a passage, and when the flow is reversed, the spool is pressed against the valve seat to be closed. For the wafer type check valve, when the fluid flows from left to right, the spool is opened to form a passage. When the flow is reversed, the spool is pressed against the valve seat and closed, and the clip type check valve can be multi-position. Installation, small size, light weight and compact structure.
(three) regulating valve
The pressure difference between the valve and the valve is constant. When the opening degree of the ordinary valve changes within a large range, the flow rate does not change much, and when it reaches a certain opening degree, the flow rate changes abruptly, that is, the adjustment performance is not good. The regulating valve can change the spool stroke according to the direction and size of the signal to change the resistance of the valve, so as to achieve the purpose of regulating the flow. The regulating valve is divided into a manual regulating valve and an automatic regulating valve, and the manual or automatic regulating valve is divided into many types, and the regulating performance is also different. The automatic regulating valve has a self-operated flow regulating valve and a self-operated differential pressure regulating valve.
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