The opening and closing the main rising-stem gate valve at https://stvvalves.com/ can be a disc, as well as the movement direction from the disc is perpendicular for the direction in the fluid. The rising-stem gate valve can just be fully opened and fully closed, and can't be adjusted or throttled.
Disc has two sealing surfaces. The two sealing surfaces from the most widely used mode disc valve form a wedge. The wedge angle varies with valve parameters, usually 50, and 2°52′ if the medium temperature is not high. The disc with the wedge gate valve can be done into a whole, referred to as a rigid disc; it's also made to a disc that may produce slight deformation to increase its manufacturability to make up for that deviation on the sealing surface angle in the processing. This disc is termed an elastic disc .
Deciding from a ball valve or gate valve depends upon various factors like price, how and where the valve is going to be used, along with the materials that will probably be flowing over the valves. You may find that you simply choose one or even the other, or perhaps a combination of both.
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There are 2 distinct forms of linear valves: rising stem (multi-turn) and axial. While both valve types make use of the linear motion on the flow obstructer, they're very different in construction and operation.
Multi-turn rising stem valves move the obstructer with the rotation of any threaded rod (stem) which can be attached for the obstructer Examples of multi-turn valves are gate valves, globe valves, pinch valves, diaphragm valves, and needle valves. These valve types are popular for flow control applications.
Axial valves use pneumatic or electro-magnetic force to slide the obstructer along an axis. Some examples of those are coaxial valves, and angle seat valves. These valves are normally fast acting and only employed for on/off process applications.
