What is the gate valve?
Gate valve is a type of plug located on the flow blocking pipes. These valves simply prevent the liquid from passing through a wedge that slides in and out of the pipe. In most cases, the gate valve is designed to be completely open or completely closed. As a result, these valves are rarely used as a means of control; Generally, they just stop the flow completely or are unused. Partially enclosed valves can increase the pressure in the system unpredictable or cause vibrations in the liquid.
The gate construction is quite simple. In general, they have two threaded connectors that hang up in the pipeline. It is possible for the gate connector to have more than two connections, but this is very rare. The number called the bonnet rises above the connectors; This area holds a stop wedge and a mechanism for increasing and reducing it. Finally, the handle that controls the rising and reducing the back of the bonnet.
When the handle is tourned, it moves the plug inside the valve. StopwatchIt slips down into the pipe and blocks the liquid before the passage. The valve will usually indicate the position of the plug on the outside of the valve, or the handle screws and protrudes to show the relative height of the plug. The valve case is slightly wider than the connected pipes, which allows the plug to completely cover the hole and make it completely liquid.
The method used to connect the bonnet to the valve has an impact on the use of the gate valve. If the bonnet is simply screwed, the valve will work well for light applications. The screw bonnet works well for cumbersome tasks, but they cannot be disassembled for repair or cleaning. The Union-Bond's bonnets can be easily disassembled, but also have the highest escape. The latest style is the pressure-fastened bonnet-it works well in many different environments, but it is also the most expensive style.
Because the gate valve should be either open or closed all the way, it should have no impact on the totalpressure. The correctly designed valve will be exactly the same size on the inside as the pipe, as any narrowing or extension of the hole will change the flow rate. When the gate is closed, the pressure should be constant in the system because there is no movement at all.