Names and functions of valve accessories for product delivery
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What are the names of all those in icons 1.2? What is its function?
Looking at the picture, 1 is the flow control valve, which provides flow stabilization; 2 is the quick-release valve, designed to act quickly in case of valve failure. The picture isn’t very clear, so it’s difficult to see the path of the air flow
Quick exhaust valve? I’ll go take another look this afternoon and take a detailed photo. I don’t understand how a quick-release valve discharges air
Quick exhaust valve: Air is allowed to flow in from above to the right when the valve needs air, while no air flows in at other times. When the valve needs to be vented, air should be introduced from the right downward; no air flow is allowed in any other direction
How to control when to exhaust? Photos taken just now
1. “1” is an adjustable quick-release valve; “1” should also have an exhaust port. In other words, the amount of gas flowing from right to left can be adjusted using the knob above. When the solenoid valve is de-energized, that is, when the gas supply is suddenly interrupted, the gas flows back to position “1” through the valve diaphragm and is then quickly discharged through the exhaust port. Ensure the valve reaches a safe position quickly. “Inside the 1” attachment are two valves: one is a control valve and the other is a check valve. 2. Quick discharge valve. When there is pressure at the air inlet at the top of the quick-release valve, the right and lower sides are closed, and all the air supply to the diaphragm head comes from \"1\". However, when the solenoid valve is de-energized or the air pressure is below the safe level, that is, when the pressure at the top of the quick-release valve is low, the right and lower sides of the quick-release valve become open. The air from the diaphragm head is quickly discharged through the quick-release valve. This valve is an important type of valve that allows for slow adjustment, enabling it to reach a safe position quickly.
This post was last edited by tongtong_HHKQ on 2017-8-18 17:06. The computer is too slow; I can’t delete it!
This post was last edited by tongtong_HHKQ on 2017-8-18 17:05. Agree!
The air path behind the solenoid valve splits into two branches. If the valve needs to be opened, which path does the instrument air from the positioner take? Does it go through the black flow restrictor or through the quick-release valve to reach the valve’s cylinder? Why split it into two paths? Can’t we just use the path with the quick-release valve?
1. When the solenoid valve is de-energized, the output air from the positioner is cut off. Logically, it is set such that when the solenoid valve is de-energized as part of the interlock mechanism, the interlock locator outputs 4 mADC. The locator itself has exhaust vents that allow the pressure in the pipeline connected to its output to be released. However, the exhaust velocity of the positioner is far from sufficient to meet the requirements for rapid valve opening. When the solenoid valve fails and loses power, the output of the positioner remains normal; at this point, the air output from the positioner stops just before reaching the solenoid valve. 2. The output from the solenoid valve is divided into two paths; this is because such valves require a controlled flow rate. When designing the pneumatic circuit for these valves, flow restrictors are added to assist the actuator in case the output signal from the actuator is too strong or if there are fluctuations when the valve is closing. 3. Based on your description, the valve appears to be of the fail-open type; from the perspective of the air circuit, it operates with slow closing and fast opening. Valves with such air circuit characteristics are commonly used in critical locations such as in units designed to prevent surge.