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202301023304 (1517227-M)
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Laminar Malaysia Sdn Bhd
202301023304 (1517227-M)
WE'RE ON MAP
sales@laminar.my
An automatic control valve is a regulating valve for the flow or the pressure (or both) of a fluid in a pipeline system. Automatic control valves consist of a main valve, which is the actual valve and it is usually a globe valve design, and a self-actuated pilot valve that controls the opening and closing of the main valve in response to the pressure condition in the pilot valve piping system.
Thus an automatic Control Valves do not need an external power source as the fluid’s pressure is sufficient for operating the control valve via the pilot valve. The pilot valve represent a spring-loaded pressure relief valve that control the main valve by the fluid being discharged. Pilot valve can be replaced by other control devices such as solenoid valve, electric actuators, pneumatic actuators or hydraulic actuator.
The main purposes for using an automatic control valves is to protect the pipe and pumps from pressure surges, prevent transients, dissipate excess energy, mitigate the risk of cavitation and perform other crucial functions. It is a very important component of any hydraulic system. Automatic control valves usually respond to signals generated by independent instruments such as flow meters, temperature sensors or pressure gauges or other devices.
Many types of automatic control valve have been produced over the years across different industries. The design and operational features of automatic control valves may be summarized as follows:
– Control (modulating)
– on/off (in some cases)
– density
– temperature
– chemical composition, if corrosive
– pressure drop across the valve
– operating pressure in the system
– min. flow to be controlled
– normal operating flow
– max. Flow
– nominal pipe size
– pressure class
– end connections type
The design of an automatic control valve depends on these specific requirements.
The term control valve refers more to the function than the style of the valve. It can refer to any valve that serves to regulate the steady-state flow or pressure in a system. Of more interest are control valves used to control the flow without creating undesireable transuents, excess cavitation, or head loss and able to function under all expected flow conditions.
The design of a particular control valve depends upon the specific system requirements and the need to provide a suitable solution. Control valves can be grouped into two main categories:
– Globe valves (e.g. hydraulic-automatic diaphragm control valves)
– Cage trim valves (e.g. plunger or needle valves)
– Butterfly valves
– Plug valves
– Ball valves
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