Valve’s Ray Ueno stated he worked with Gabe Newell and their colleagues to develop the “guy in the logo” when they decided to call the company “Valve” around 1995-1996, and needed to develop the visual brand vocabulary to go along with it.

Most valves are named, the design of their disks. The seat or seal rings provide the seating surface for the disk. A valve may have one or more seats. In the case of a globe or a swing-check valve, there is usually one seat, which forms a seal with the disc to stop the flow.

Faucet valves are used specifically to control water flow in kitchen and bathroom faucets. They are different types of water valves designed for this purpose, including ball valves, cartridges, ceramic disc valves and compression valves. Many are used as tub and shower valves.

The definition of a valve is a device that opens or closes to let things through or to prevent passage. The part of your heart that opens and closes to let blood enter or to prevent blood from entering is an example of a valve.

valve, in mechanical engineering, device for controlling the flow of fluids (liquids, gases, slurries) in a pipe or other enclosure. Control is by means of a movable element that opens, shuts, or partially obstructs an opening in a passageway. A needle valve has a long tapered needle fitting in a tapered seat.

A valve is a type of fitting that allows for regulation, control, and direction of fluids passing through a pipe. Valves allow homeowners to isolate sections of plumbing for repairs, or shut off a water line when a leak sprouts. They are also widely used throughout most commercial and industrial applications.

Scour valves are located at low points or between valved sections of the pipeline. Their function is to allow periodic flushing of the lines to remove sediment and to allow the line to be drained for maintenance and repair work.

Components

• body.
• ports.
• seat.
• stem.
• disc when valve is open.
• handle or handwheel when valve is open.
• bonnet.
• packing.

The two semilunar (SL) valves, the aortic valve and the pulmonary valve, which are in the arteries leaving the heart. The mitral valve and the aortic valve are in the left heart; the tricuspid valve and the pulmonary valve are in the right heart.

Because of the diversity of the types of systems, fluids, and environments in which valves must operate, a vast array of valve types have been developed. Examples of the common types are the ball valve, butterfly valve, globe valve, gate valve, plug valve, diaphragm valve, reducing valve, needle vave, check valve and safety/relief valve.

Heart Valves. The heart has four valves. The mitral valve, the tricuspid valve, the pulmonary valve and the aortic valve. The mitral and the tricuspid valves, also known as the atrioventricular valves, are located between the top chambers of the heart, the atria, and the lower chambers of the heart, the ventricles.

The valves that lie between the atria and the ventricles are called the atrioventricular (AV) valves. The right AV valve is the tricuspid valve, and the left AV valve is the bicuspid.