Rising Stem Gate Valves

gate valves
A valve with a sliding part that controls the extent of the aperture
(Gate valve) A gate valve, also known as a sluice valve, is a valve that opens by lifting a round or rectangular gate/wedge out of the path of the fluid.
(Gate valve) A valve with a circular-shaped closing element that fits securely over an opening through which water flows. A valve that utilizes a disc moving at a right angle to the flow to regulate the rate of flow. When a gate valve is fully opened, there is no obstruction to the flow.
(GATE VALVE) A two-way valve that may be opened or closed to block the flow of fluid in a passage. Normally manually operated, but may be automated, especially for larger sizes.

rising
advancing or becoming higher or greater in degree or value or status; "a rising trend"; "a rising market"
An armed protest against authority; a revolt
rise: a movement upward; "they cheered the rise of the hot-air balloon"
acclivitous: sloping upward

stem
root: (linguistics) the form of a word after all affixes are removed; "thematic vowels are part of the stem"
The main body or stalk of a plant or shrub, typically rising above ground but occasionally subterranean
The stalk supporting a fruit, flower, or leaf, and attaching it to a larger branch, twig, or stalk
A long and thin supportive or main section of something
cause to point inward; "stem your skis"
grow out of, have roots in, originate in; "The increase in the national debt stems from the last war"