Two five-way valves in series
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Could you help figure out what logic this is? 2/5-way solenoid valve (black) + pneumatically controlled 2/5-way valve (white)? ? Is it unnecessary or a security setting?
Multiple control requirements. Some are combined and referred to as “servo valves”. It is recommended to check the instructions, procedures, circuit principles in this regard.
I think it’s because the CV value of the solenoid valve is low, resulting in slow valve operation; at this point, the function of the pneumatic control valve is to act as an accelerator； Also, when this valve is to be set to the fault position, the solenoid valve loses power, and the control gas in the cylinder is quickly discharged through the air control valve.
The valve that increases airflow operates more quickly
As the amount of air drawn in increases per unit time, the exhaust also occurs more rapidly, resulting in faster expulsion
The flow rate requirement cannot be met with the existing solenoid valve; using a solenoid valve with a larger diameter is costly, while installing a pneumatic valve to increase the flow rate is less expensive.