How to estimate the air consumption of pneumatic switching valve?

There is a detailed introduction in the "Chemical Automation Control Design Regulations", it is recommended to read it. 1. Based on the number of control valves, the air consumption of each control valve is 1~2Nm3/h ； 2. The air consumption of each pneumatic instrument in the control room is 0.5~1Nm3/h ； 3. The air consumption of each pneumatic instrument on site is 1Nm3/h ； Pneumatic switch valve is a type of pneumatic control valve. In order to consider the margin, it can be calculated as high.

You should refer to the manual, it's hard to estimate.

I think the control valves stipulated in the chemical automatic control design regulations are for regulating valves. For on-off valves, since they usually do not consume air, they cannot be calculated according to the standard reference quantity. If calculated according to that quantity, the compressor will be too large. Personally, I think the compressor can be calculated without considering the on-off valve and the storage tank should be made larger. But there is no normative basis either.

Pneumatic diaphragm regulating valves follow the standards. For on-off valves, I think the cylinder volume and valve action frequency should be referenced.

My current project has more than 40 on-off valves, including large valves of DN450. The switching action is required to be within 2 seconds. I don’t know how to calculate the air consumption?

The specifications are general, are they applicable to everyone?

The gas consumption of the regulating valve is generally 1.6~2.5Nm3/h, and the gas consumption of the switching valve is usually 3~5 times that of the regulating valve.

It depends on the condition of the device. If there are a large number of on-off valves and the diameter is large, the gas consumption will be large. If there are only a few valves and they are not used frequently, they can be ignored. Just consider that the storage tank capacity is slightly larger.

This post was last edited by zlky2005 on 2009-6-10 13:39. I have a calculation formula to share with you for reference, and the required opening volume and closing volume of the cylinder are listed in the table respectively, which is convenient for querying and calculating the specific air consumption. The calculation formula is attached to the table below. Serial number. Optional cylinder model. Quantity. Opening volume (liters). Closing volume (liters) 1 105DA 24 0.94 1.18 2 125DA 118 1.47 1.85 3 140DA 117 2.43 3.2 4 160DA 33 3.65 5.3 12 190DA 35 5.9 7.9 13 210DA 43 7.4 9.7 370 Air consumption depends on the air supply pressure, switch stroke, volume and number of actions. It is calculated as follows: L/Min=Air volume (Air volume Opening +Air volume closing)××Action cycle times (/min) L/min = cylinder volume (opening volume + closing volume) × (air supply pressure (Kpa) + 101.3) ÷ 101.3] ×times/minute

If it is a pneumatic diaphragm actuator (single-acting), can it be considered: Cylinder volume = effective area of ​​diaphragm x maximum stroke of diaphragm.