What are the respective applications of the pneumatic control valve, the quick release valve, and the amplifier?
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Just starting out with valve selection, I found that these three functions are all used to achieve rapid opening and closing in either angular or linear motion. But I still would like to consult everyone on how to make the choice. It would be great if you could briefly explain the principle so it’s easier to understand. Thank you
“What are the respective applications of the pneumatic control valve, the quick release valve, and the amplifier? ”. I’m not sure about the origin of these nouns; please let me know. A typical \"pneumatic control valve\" could be a pneumatic diaphragm control valve \"(or a control valve driven by a cylinder, as well as a on/off switching valve or a quick-acting valve. It has different names. As for that amplifier, it’s hard to say; it might be inside the positioner of the valve actuator. A pneumatic valve is driven by an instrument air source, with its on/off operation controlled by a solenoid valve. It’s best to ask the relevant personnel on site for specific details. New companies where one is just starting out should provide mentors, and it is essential to make full use of this resource for systematic learning. For reference.
There are indeed amplifiers in the locator, but there are also external amplifiers. For example, the YT-3XX series from Yongtai is a device that receives the output pressure from a positioner mounted on a pneumatic control valve and delivers it at the same pressure to the actuator; it uses a high-flow air supply to accelerate the response speed of the control valve. It can provide a large flow rate to the actuator, thereby increasing the speed of valve operation.
This post was last edited by CHANGBAISHI on 2020-3-17 at 15:04. Thank you for the advice; since the functional requirements for the actuators of such valves vary, I simply tried to guess the simplest type of actuator to ask about, before I became aware of the specific issues involved. As for the original intention, it depends on what the poster has in mind; maybe you’re right. Oh, if more functions are added, there will be even more – it’s not just an amplifier.
There’s no need for guidance; we learn from each other*:handshake. I just happen to work in control valves
A pneumatic control valve is a type of on-off control valve that regulates the timing of opening and closing the valve. The amplifier is used to control the volume of air supplied to the control valve, thereby regulating the on-time. The quick exhaust valve is installed at the air inlet of the cylinder to enable faster exhaust from the cylinder
Pneumatic control valves, quick-release valves, and amplifiers – in general, these three devices are all used to control the timing of valve opening and closing. The solenoid valves and positioners that come standard with valves have limitations due to their own pneumatic circuits; as a result, the flow rate of the process air they can handle cannot be infinitely high. In fact, especially for positioners, the amount of process air that can pass through them per unit of time is even smaller. This flow rate has little impact when controlling small nozzles (cylinders), but it can cause the valves to operate very slowly when large cylinders are in use. The differences among these three devices are as follows: Quick-release valve: It is generally used for valves that are not particularly large. It cannot increase the air flow in the pneumatic circuit; instead, it serves to quickly remove gas from the nozzle during circuit switching. Pneumatic control valve: It is used to amplify the pneumatic circuit associated with valve opening and closing. It controls the on/off operation of solenoid valves, whose pneumatic circuits are usually small in size (6mm, 8mm, etc.), by enabling the control of valves with larger diameters (up to one or two inches), thereby allowing for rapid valve switching. Amplifier: It is used to amplify the pneumatic circuit of valves. Its difference from a pneumatic control valve lies in the fact that while a pneumatic control valve can only control whether the pneumatic circuit is open or closed, it cannot control the pressure within that circuit. An amplifier, on the other hand, can generate different pressures based on the signals from positioners. A quick-release valve can be used in combination with the other two types of devices
In simple terms: Pneumatic control valves are used in the air circuit of valves, and they are generally placed after solenoid valves to address the issue of too small a CV value on the solenoid valve, which results in slow valve operation. Pneumatic control valves reduce the switching time. As the name implies, a quick-release valve is designed to facilitate rapid release; it only speeds up the timing of exhaust release and has no effect on the intake path. Pneumatic amplifiers are generally used at the rear end of control valve positioners; they function as a 1:1 pneumatic signal amplifier to speed up the response time of the control valve.
The amplifier mentioned by the poster is probably a pneumatic relay