Wegman valves offers various types of check valves
Piston check valves are globe valves without a stem and the plug is usually held down by a spring.
In many cases used under 2” but in the non slam piston style available till 12”
The smaller valves are typically forged where the non slam style is made in cast.
The standard piston check valve is a solid “plug”, the non slam version is a more engineered product with an integral check valve and orifice in the piston to enable the non slam function.
Also think of the screw down non return check valve, a check valve that can block the flow in a controlled way or a globe valve with an integrated non return function when left open.