Throughout my career, non-return valve integrity and application have been a concern.

I covered this with my students using a typical compressor discharge arrangement.

To reduce the probability of failure on demand, two in-series NRVs are deployed to prevent back flow from the high pressure discharge to the lower pressure rated suction on a blocked outlet scenario.

To avoid common mode failure the valves are usually of two different types.

API 521 Pressure-relieving and depressurizing systems, suggests assuming a leak rate as an orifice 10% of the valve area.

Why not make the design inherently safe – rate the low pressure suction side to the same as the discharge?

Or, ensure the discharge volume is sufficiently small to prevent a suction overpressure?

Informative…
Quote [Why not make the design inherently safe – rate the low pressure suction side to the same as the discharge?

Or, ensure the discharge volume is sufficiently small to prevent a suction overpressure?] Unquote

Good suggestions but not possible to do for many cases due to techno-economical (higher rating leads to higher weight/cost) and technical (lengthy discharge piping route from compressor’s discharge nozzle to check valve(s) located after tapping point for ASV) issues…

Bottom line, to be conservative and at the same time providence; the design pressure of the suction piping doesn’t need to be considered equal to that of the discharge piping and it’s adequate to be equal to the compressor’s “settle out pressure”.