How to differentiate between regulating pneumatic valve and control valve

now domestic pneumatic valve and regulating pneumatic valve to control the basic no clear distinction, tend to control pneumatic valve and pneumatic valve generally call together, more is with pneumatic valves are referred to as the regulation of the actuator, pneumatic valve, pneumatic valve, the concept of control has not yet deeply rooted in the hearts of the people, see those doing on the network control pneumatic valve website, is called the pneumatic control valve pneumatic valve adjustment. I think there are some concepts necessary to clarify that out of view, the only issue of the topic.
the definition of pneumatic control valve should be: the most commonly used in industrial process control terminal control element is the control of pneumatic valve. Pneumatic control valve adjustment of flow of fluid, such as gas, steam, water or chemical compounds, to compensate the load disturbance and the controlled variables as much as possible close to the process of the set point. Sensors such as pressure, temperature, flow rate feedback signal to the regulator, regulator will measure the signal is compared with the set value, and then according to the result of computing the output control signal to control pneumatic valve, by the pneumatic control valve to adjust the pneumatic valve opening, thus realize the parameters such as temperature, pressure, flow rate of the automatic adjustment. According to this definition, a pneumatic valve must be and sensor, controller, PLC, DCS or simple controller) Control circuit ( Whether single loop or multi loop) Realize the control of process variables to call control pneumatic valve. So, all equipped with pneumatic actuator, electric, hydraulic pneumatic valve, should be called control pneumatic valve, including solenoid pneumatic valve, because they can control circuit and control system, to realize automatic control. Whether they receive is switch signals or proportion, and the control principle is the same. And all the manual control pneumatic valve pneumatic valves are not. Some pneumatic valve manufacturers and automatic control of pneumatic valve and its definition should be the same as control pneumatic valve.
and regulating pneumatic valve, pneumatic valve is a throttling, for throttling pneumatic valve, its purpose is to produce pressure drop and reduce the traffic, so it can have a diameter much smaller than the pneumatic valve size of pneumatic valve seat. Throttling the design of the pneumatic valve is the pressure drop in order to reduce the linear pressure, flow, temperature, and switch on the structure of the pneumatic valve allows a straight line through the fluid without pressure drop significantly. Such as O type pneumatic ball valve, pneumatic valve, pipe clamp, pneumatic butterfly valve, etc. , their flow resistance are small and medium pressure drop through the generated are small and so is suitable for switch control, not suitable for throttling control. Pneumatic valve throttle need according to the requirements of process design the appropriate flow characteristic and pneumatic valve, pneumatic valve seat diameter, pneumatic valve does not need to switch. Throttling pneumatic valve with actuator, electricity, gas or hydraulic regulating pneumatic valve. So narrowly, regulate the pneumatic valve limited to throttle pneumatic valve, pneumatic valve, such as single two-seater pneumatic valve, pneumatic valve sleeve, pneumatic valve, pneumatic valve, three-way Angle v-shaped ball pneumatic valve and so on several kinds of limited ( So the pneumatic valve and manual adjustment in the industry say) 。
, as it were, all regulating pneumatic valve pneumatic control valve, but control pneumatic valve are not necessarily pneumatic valve adjustment. As for self-reliance type pneumatic valve adjustment, it should not be subsumed in the class of pneumatic control valve, because whether it's self-reliance type pressure regulating pneumatic valve, or temperature, flow control, pneumatic valve, is entirely a matter of medium itself the power to drive pneumatic valves, control variables have to rely on manual to set, they can't control circuit and control system. They should and security pneumatic valve, hydrophobic pneumatic valve, relief valve, hydraulic pneumatic valve control in automatic pneumatic valve category.
personal humble opinions, if you want to simplify the classification of pneumatic valves, than can be divided into pneumatic valve, pneumatic valve, throttle switch automatic pneumatic valve three categories.