Ball valve. Ball valves use a stainless steel ball to control water flow. There are three basic valve styles, making this a classic case of good, better and best (described in order as follows). All three can be used for water, oil or airflow control if the casting has WOG stamped on it.
https://www.familyhandyman.com/plumbing/valves/plumbing-valve-basics/view-all/
As the mitral and tricuspid valves close, the aortic and pulmonic valves open to allow blood to flow from the contracting ventricles. Blood from the left ventricle is pumped through the aortic valve to the rest of the body, while blood from the right ventricle goes through the pulmonic valve and on to the lungs.
http://www.yourheartvalve.com/heartbasics/Pages/heartfaqs.aspx
That's the job that valves do: valves are like mechanical switches that can turn pipes on and off or raise or lower the amount of fluid flowing through them. Let's take a closer look at how they work! Photo: This stop valve is manually operated: you open and close it by turning the wheel.
http://www.explainthatstuff.com/valves.html
A poppet valve (also called mushroom valve) is a valve typically used to control the timing and quantity of gas or vapour flow into an engine. It consists of a hole, usually round or oval, and a tapered plug, usually a disk shape on the end of a shaft also called a valve stem.
https://en.wikipedia.org/wiki/Poppet_valve
Gate valves are called full-flow valves; there's a direct unobstructed path for flow right through the middle of the valve. A wedge-shaped brass gate is lowered into a machined slot to close the valve. They should either be completely open or completely closed.
https://www.familyhandyman.com/plumbing/valves/plumbing-valve-basics/view-all/
A locked open ball valve is a ball valve that uses a locking mechanism to lock the valve into place in an open position. By using a lock, a user ensures that the valve does not close by mistake when it should be open. People working in the vicinity of pressure-relief devices should be protected from malfunctions.
https://www.hunker.com/12433234/what-is-a-locked-open-ball-valve
What Is a Locked Open Ball Valve? Ball valves control the flow of oil or gas with a small turn of the ball, either with a handle or an actuator. Ball valves are used in every shut off/turn on operation ranging from cheap valves for domestic use, to huge valves for industrial applications that cost thousands of dollars.
https://www.hunker.com/12433234/what-is-a-locked-open-ball-valve
Frequently Asked Heart Valve Questions. What is a heart valve? Your heart has four valves: the mitral valve and the aortic valve on the left side of your heart and the tricuspid valve and the pulmonic valve on the right side of your heart. In order for blood to move properly through your heart, each of these valves must open and close properly as the heart beats.
http://www.yourheartvalve.com/heartbasics/Pages/heartfaqs.aspx
Internal combustion engine. Poppet valves are used in most piston engines to open and close the intake and exhaust ports in the cylinder head. The valve is usually a flat disk of metal with a long rod known as the 'valve stem' attached to one side.
https://en.wikipedia.org/wiki/Poppet_valve
Stop valves are closed by screwing a rubber gasket down onto a seat in the middle of the valve. Pros only use small versions that act as shutoff valves for fixtures such as sinks and toilets and outdoor sillcocks. Flow is inefficient because of the circuitous route the fluid (water, in most cases) has to follow.
https://www.familyhandyman.com/plumbing/valves/plumbing-valve-basics/view-all/
what open valves
A locked open ball valve is a ball valve that uses a locking mechanism to lock the valve into place in an open position.