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/
It can be defined as followed. Valve in sliding water gate.
a gate valve is a positive shut off valve for liquids and gases and should only be used in the fully open or closed positions, different temperatures and pressures must be considered to insure the correct type of valve to install. a sluice valve is a non-positive shut off valve used for heavier materials such as stone,grain,sand,etc.
The external housing (shell) of gate and globe valves are similar, but the globe valve is designed to serve as a regulating valve, meaning that it can adjust the flow by the percentage of the opening. However, the gate valve is not designed to regulate flow, but to stop the flow. A gate valve should always be either fully open or fully closed. The main difference is in the form of the inner elements and the form of the flow inside the valves. In addition, the gate valve may have a rising or non rising stem while the globe valve is typically a rising stem design. The direction of flow through a gate valve is not important. However a globe valve has a flow direction indicated on the outer shell (body) which indicates the direction of flow from beneath the seat. In a gate valve, the closure element is a plate or disk which travels parallel to the plane of the seat. The gate in a dam is a well known example. In a globe valve, the closure element is usually called a "poppet", and it travels perpendicular to the plane of the seat. There are specific advantages and disadvantages to each type depending on the application. The application for a globe valve is regulating flow. It is not well suited for full stop isolation. The gate valve is an isolation valve and not designed to regulate flow.
Ball valve is usually preferable. full flow with no restriction and a lot easier and faster to turn off when needed.
A gate valve is positive shut off and used for on of off . A globe valve is for throttling
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
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/
The Gate valve is the stop valve & the Globe valve is the fluid Regulating valve.
It can be defined as followed. Valve in sliding water gate.
Never. Throttling will erode the valve seat and then the valve will never shut off completely.
By shutting off the water supply and replacing the valve
Application is shutting off supply, usually water. -Gate valves are 'Old hat' and inefficient, get a new ball valve instead.
Ball valves: The handle will be parallel to the pipe when on and perpendicular when off. Gate valve: Clockwise off, Counter-Clockwise on.
You could take it off and clean it with carburetor cleaner, but it probably will not help. It will need replaced.
Because the inner area where the fluid moves has a gate which is shaped like a butterfliys wings. Passing through the centre of this gate is a rod which ends outside the valve where the handle is attached. When the gate is open it allows flow, when closed the gate seals off the valve stopping flow or if require can be partially turned to restrict flow
a gate valve is a positive shut off valve for liquids and gases and should only be used in the fully open or closed positions, different temperatures and pressures must be considered to insure the correct type of valve to install. a sluice valve is a non-positive shut off valve used for heavier materials such as stone,grain,sand,etc.