A water valve is similar to a switch. With a valve you can open and close a waterflow.
A water valve is a mechanism by which you can control water availability or flow. Opening and closing of the valve is most often by lever or wheel control, operating a gate, ball, or butterfly to stop/release water flow.
Depending on its location in the Plumbing, the valve may have different purposes and designs. Different varieties offer varying degrees of control, durability, and ease of use:
# A standard spigot is a gate valve which is designed for variable water pressure and flow, such as for a sink or shower. Those in public areas generally have more aesthetically pleasing appearance. # An emergency shut-off valve, often either a butterfly or ball valve, is designed to close off the flow of water quickly in the event of a plumbing emergency such as a broken pipe or overflowing toilet. In a butterfly valve a flat disc is turned within the pipe by an external knob/lever. A ball valve is commonly illustrated in plumbing pipes games (see link, below.)
# A pressure-reducing valve can be used either at the entrance to a building from the public water supply or within the building's plumbing system, for example to reduce the water knocking common in hot water heating systems. # Check valvesallow unidirectional flow, and may stop the flow of water after a certain volume has passed, such as from tank to toilet, in which example the valve is controlled by a float which gauges volume in the tank; # Mixing valves, for example to control the temperature of water blended from hot and cold water pipes. # Solenoid valves, which care used in heating systems and sprinklers. The valve mechanism employs gaskets, springs, and even electricity.
An air valve is a spring loaded plastic valve for ventilation. A gate valve is an old fashioned type of water valve where turning a handle lowers a blocking gate over the water inlet. Any sensible plumber now uses ball valves instead.
By shutting off the water supply and replacing the valve
It can be defined as followed. Valve in sliding water gate.
A gate valve
after gate valve, because when you want make maintenance for sump pump , you don't want all water in the pipe drop down sump pump - gate valve - non return valve
the gate and the valve.
Application is shutting off supply, usually water. -Gate valves are 'Old hat' and inefficient, get a new ball valve instead.
Forged steel gate valve flanged is just a gate valve which with a flange.
A gate valve is positive shut off and used for on of off . A globe valve is for throttling
A Knife Gate Valve is used to slice through sludge /sewerage and a gate is used fro normal positive shut off If you want to find the photo of Knife Gate Valve,you can enter to the link:http://www.kolinkcn.com/
regulator consisting of a valve or gate that controls the rate of water flow through a sluice
a gate valve is a valve you turn the handle round and round until it shuts off a ball valve is a valve with a lever that you turn 1/4 turn and its off hope this helps plumber paul