Look for solenoid valves or electric valves that can operate in both negative and positive pressure conditions
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It is a life test of cyclic pressure under negative and positive pressure in a gas cylinder. First, use a pressure pump to increase the pressure in the gas cylinder to 4 MPa, then open S2 to release the pressure to atmospheric level. After that, close S1 and S2, and then open S3 to activate the vacuum pump and create a vacuum inside the gas cylinder. Then turn off S3 and turn on S2 to restore the gas cylinder to atmospheric pressure, and finally increase the pressure to 4 MPa. And this repeats in a cycle. The operating voltage is 24VDC, the operating pressure ranges from -0.1 MPa (near vacuum) to 4 MPa, the working medium is ammonia, the medium temperature lies between -20 and 60°C, and the diameter is around 4–6 mm; it can be slightly larger as well. Which company has such a product? Please recommend one, thank you!
I want to use a solenoid valve to replace S123, 3 valves? That would require a solenoid valve assembly; it should be possible
Your design diagram is unreasonable; it is recommended to install a filter and a check valve behind the valve.
An electric ball valve with a pressure rating of 2000 PSI can be used; such a ball valve (with a valve body featuring ridged sealing grooves) can be employed for alternating operation between negative and positive pressures.