What should be considered when connecting pneumatic valve exhaust to a shared pipeline? Back pressure and motion interference

Shared exhaust will increase new outlet pressure and mutual influence conditions. The customer submits the simultaneous action, pipeline, and end device to the complete set party for confirmation and acceptance according to the final layout, not only testing the free exhaust of a single valve.

The exhaust end is not always equal to atmospheric pressure

Directly exhaust to the outside and connect to the collection pipeline, the conditions faced by the accessories are different. The diameter, length, bends, noise reduction, and end treatment equipment all affect the exhaust path. You cannot select a cylinder based solely on the supply pressure without checking the actual condition of the exhaust end.

If multiple devices operate simultaneously, the instantaneous exhaust load will also change. A single valve tested normally does not mean that the entire group works normally simultaneously. Request for quotation to provide the number of simultaneous actions, pipeline layout, and end pressure conditions to avoid the supplier calculating based on free exhaust and using shared recycling on site.

Back pressure may affect action and accessory functionality

The driving force of the actuator is related to the pressure relationship of the corresponding chamber, and exhaust obstruction may alter the motion process. Electromagnetic valves, quick exhaust or other accessories also have their own allowable conditions. It is not possible to replace the applicable range of each component with a single pressure value of the main pipe.

Some gas paths are sensitive to back pressure or exhaust organization and must be designed according to actual conditions. The selection of shared exhaust and fast exhaust accessories discussed here is different: nearby fast exhaust aims to shorten the path, while shared pipelines introduce new paths and boundaries. Two measures cannot be simply stacked without evaluation.

The mutual influence between devices should be clearly seen on the diagram

Sharing exhaust pipes may affect the exhaust conditions of one device by another. The design should specify the branching, connection, and end conditions, and necessary isolation or special components should be determined by the actual plan. It is not allowed to arbitrarily add check elements and claim that there is no crosstalk.

Exhaust also involves environmental requirements. The normal compressed air discharge of the actuator should not be confused with the possible pollution caused by abnormal conditions. If the collection purpose is related to the handling of hazardous substances, professional evaluation is required, and ordinary pneumatic pipelines cannot be used as process medium recovery systems.

Acceptance shall be based on the final pipeline rather than temporary short pipes

The actual solenoid valve and cylinder of the pneumatic ball valve on this site should be included in the confirmation diagram, and shared exhaust is not a default function of the model. The manufacturer's information provides the pneumatic principle, and cannot transfer the back pressure figures from other manufacturers to the guaranteed values of the attachments on this site.

Delivery and on-site acceptance inspection of actual assembly, exhaust end, and simultaneous action scenarios. Record the gas supply and exhaust status when testing the switch time, and check the fault action and recovery. The no-load test of only connecting a short pipe next to the solenoid valve cannot prove that the final long pipeline meets the requirements.

The focus of maintenance is to make changes traceable

Blockage of the muffler, accumulation of fluid in the pipe, or changes in the end equipment may all cause changes in the original exhaust conditions. The inspection data indicates the path and the areas that need attention. When the movement slows down, compare the exhaust conditions first, and do not rush to increase the air supply or replace the larger cylinder.

Handle pneumatic energy storage and misoperation risks according to approved procedures before maintenance. After the end of pipe treatment facility shutdown or branch pipe renovation, the affected valves should be rechecked. Treating the exhaust pipe as an ordinary non pressure drainage pipe can easily overlook its impact on control functions.

Confirmation documents for shared exhaust plan

Corresponding products and further reading

Exhaust collection should be designed as a complete set of air circuit, not by connecting several hoses together. Only when the gas supply, back pressure, simultaneous action, and end conditions are confirmed together can the true performance of the action be explained and accepted.

Can be combinedPneumatic Ball ValveData compilation for this working condition; See for similar structurespneumatic valveColumn. The specific configuration and delivery basis need to be confirmed separately.

Extended reading:Is it better to have a larger interface for the pneumatic ball valve solenoid valve? Flow capacity and exhaust path。

General technical basis:SMC Pneumatic Components and Common Exhaust Back Pressure DescriptionThe specific configuration and rated conditions of the finished product shall be subject to the information provided in this supply.