Check vale’s are designed to allow flow of a liquid in one direction, thus preventing reverse flow (flow in the opposite direction), not reduced flow. The check vale installed on my car utilizes a flapper-type valve which has a reverse flow rating of 150psi (flapper valve can prevent reverse flow up to 150psi of back pressure) and requires .5psi of back pressure to seal (shut) the flapper valve and prevent reverse flow. We could go down a rabbit hole discussing orifice plates (also known as restriction plates or restrictor orifices/RO) and check valves, but we’re getting into industrial applications such as oil and gas industry, etc.. Simply put, ‘plates’ are used for restricting/reducing psi on the downstream side only and cannot prevent reverse flow. Check valves, in their simplest form, allow flow with no reduction in psi while preventing reverse flow.
The check valve I’m using: https://www.holley.com/products/plumbing_an_fittings_and_hose/adapters/valves/one_way/parts/251008ERL