First, how to choose the valve model
When selecting a regulator valve model, the functional aspects should be considered first. According to the temperature, corrosion and other properties of the pipeline transport medium should be considered control valve temperature, corrosion resistance (corrosion, cavitation, erosion), anti-blocking, pressure difference â–³p (including the normal operating pressure difference, pressure difference when the valve is closed ), leakage should meet the requirements of the process requirements. This aspect is mainly reflected in the regulating valve body.
There are also control valve parameters, the choice of control valve parameters mainly include the choice of action mode, adjustment speed selection, adjustable ratio calculation, flow characteristics selection, valve diameter selection, and the following opening degree checking and other several parameters. This item is mainly the choice of the technical parameters of the valve actuator.
Second, what type of control valve (1) pneumatic control valve 1 according to the form of pneumatic actuators (a) film actuators. Also divided into straight type (positive and negative) and side-mounted (positive and active)
(b) Actuators of the pistons are also divided into proportional (positive and negative reactions and two positions).
(c) Long-stroke actuators (d) Rolling film actuators.
2 According to the adjustment form classification: (a) adjustment type; (b) cut-off; (c) adjustment cut-off type.
3 according to the type of movement: (a) straight stroke; (b) angular stroke.
4 According to spool shape classification: (a) flat-shaped spool; (b) plunger-shaped spool; (c) window-shaped spool; (d) sleeve-shaped spool; (e) multi-stage spool; (f) Deviated spiral valve plug; (g) Butterfly valve plug; (h) Ball valve plug.
5 Classified by flow characteristics: (a) straight line; (b) equal percentage; (c) parabola; (d) quick opening.
6 according to the form of the upper valve cover: (a) ordinary type; (b) loose (suction) heat type; (c) long-neck type; (d) bellows sealed type.
2) Electric control valve
1 According to the form of electric title mechanism: (a) angular stroke; (b) straight stroke; (c) multi-turn type.
2 Classified by attachment: (a) Servo amplifier; (b) Limit switch.
3 Classified by flow characteristics: (a) straight line; (b) equal percentage; (c) parabola; (d) quick opening.
4 according to the form of the cover: (a) ordinary type; (b) scattered (suction) heat type; (c) long-necked type; (d) bellows sealed type.
Xiao Bian epilogue: The above has introduced how to choose the type of control valve and hopes to help everyone. For more relevant knowledge, please continue to pay attention to this website information platform. Follow-up will present more exciting content for everyone.
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