A method for producing a rotary slide valve for regulating a flow of fluid, including a rotary slide (02) which is rotatably mounted about a rotational axis (R) in a valve housing, includes producing the rotary slide (02) by injection molding, producing at least one circumferential or casing section (04) of the valve housing (03) by injection molding, and installing the rotary slide (02) within the valve housing (03). A gap between the rotary slide (02) and the directly adjacent valve housing circumferential or casing section (04) of the valve housing (03) in the radial direction, allows the rotary slide (02) to rotate about the rotational axis (R) and facilitates a seal which does not exceed a tolerable leak between the rotary slide (02) and the circumferential or casing section (04) of the valve housing (03).

Apparatus to prevent fugitive emissions in rotary valves are disclosed herein. An example apparatus includes a rotary valve including a valve body, a flow control member, and a valve shaft coupled to the flow control member. The apparatus also includes an actuator including a rod that is movable in a linear direction, and a mounting housing coupled between the rotary valve and the actuator. The valve shaft and the rod extend into the mounting housing. The apparatus includes a linkage to convert linear motion of the rod to rotary motion of the valve shaft. The apparatus system also includes a bellows disposed around a portion of the rod in the mounting housing. The bellows is coupled to the rod and the mounting housing to prevent fugitive emissions from the mounting housing.