The composition of 1 control valve and classification
Control valve says to dominate a powerful person or family again, it is to carry out implement main type, adjust through accepting the control signal that controls unit output, operation of motivation of have the aid of goes changing fluid discharge. Control valve is comprised by actuator and valve commonly. If press the power that its match actuator to use, control valve can be divided move 3 kinds for pneumatic, dynamoelectric, fluid, it is the pneumatic control valve of dynamical source in order to compress air namely, it is the dynamoelectric control valve of dynamical source with report, with liquid medium (wait like oil) pressure is dynamic electro-hydraulic move control valve, additional, by its function and character are divided, still bus line of type of electromagnetism a powerful person, electron, intelligence type, spot control valve waits. The product type of control valve very
Much, the structure is varied also, and still be being updated ceaselessly and change. Generally speaking a powerful person is general, can match with pneumatic actuator already, also can match with dynamoelectric actuator or other actuator.

The choice of type of 2 control valve

The choice of the body of a powerful person of choice of type of form of a powerful person of 2.1 control valve is the most important segment in control valve choice.

Body of control valve a powerful person is a lot of more phyletic, have direct sheet commonly usedly, form of direct two-seater, horn, diaphragmatic, little flow, 3, prejudicial rotate, type of butterfly form, sleeve, globose wait for 10 kinds. Before choosing valve, condition of the medium that wants pair of control processes, craft and parameter undertake careful analysis, collect enough data, understand the requirement of a powerful person of systematic exchange part, the class of a powerful person that the data that collects according to place will come decide place wants to use. When specific choice, can consider from the following respects:

(The element such as the discharge character that structure of shape of core of 1) a powerful person basically chooses according to place and unbalance considers.

(Sex of 2) wear-resisting caustic is become fluid medium is the suspension juice that contains grain of high concentration abrasiveness when, face every time shuts joint of core of a powerful person, valve base to be able to be chafed badly. Because of this valve shed a road to want smooth, the inside data of a powerful person wants hard.

(3) is anti-corrosive have as a result of medium caustic, be in can contented adjustment below functional circumstance, choose a structure as far as possible simple valve.

(The temperature of 4) medium, pressure is become the temperature of medium, pressure is high and when change is big, the material that should choose core of a powerful person and valve base suffers the valve with little change of temperature, pressure.
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