A check valve may include: a check seat defining a flow path and including downstream and upstream sides; a poppet assembly including a poppet body and a poppet seat, the poppet seat configured to form a fluid-tight seal with the downstream side; at least one first extension extending upstream from the poppet body and including a roller; and at least one cam arm disposed at least partially upstream of the poppet body and the check seat and configured to engage with the at least one roller; and at least one cam arm disposed at least partially upstream of the poppet body and the check seat and configured to engage with the at least one roller. Engagement between the at least one cam arm and the at least one roller is configured to urge the poppet in the upstream direction.

A pressure regulator manages fluid pressure along a pathway between an inlet port and an outlet port. A poppet opens and closes the pathway within the regulator. In certain regulators, a biasing member biases the poppet in common direction with the inlet port. In certain regulators, the poppet defines a through passage to route the fluid past the biasing member. In certain regulators, an adjustment interface arrangement enables a user to set what fluid pressure level closes the pathway by changing a pre-load applied to the poppet.