Valves
All Mechanical and industrial products can come with different material structures ( Stainless steel, Carbon steel ,Alloys and Plastic made .)
A valve is a device or natural object that regulates, directs or controls the flow of a fluid (gases, liquids, fluidized solids, or slurries) by opening, closing, or partially obstructing various passageways. Valves are technically fittings, but are usually discussed as a separate category.
Valves can be categorized into the following types, based on their operating mechanism.

Ball valve
$25.00for on/off control without pressure drop. Ideal for quick shut-off, since a 90° turn completely shuts-off, compared to multiple 360° turns for other manual valves.

Choke valve
$49.00raises or lowers a solid cylinder placed around or inside a second cylinder with holes or slots. Used for high pressure drops found in oil and gas wellheads, not to be confused with engine choke valve.

Knife valve
$25.00similar to a gate valve, but usually more compact. Often used for slurries or powders on/off control.

Diaphragm
$30.00Membrane valve, controls flow by movement of a diaphragm.Used in pharmaceutical applications