The shut-off valve is called ON-OFF. These valves are used for disconnection and connection in fluid transmission lines and in addition to the operation of disconnection and connection, they also indirectly control factors such as pressure, temperature, and the volume of the flowing valve. (Water disconnection and connection valve)
Shut-off valves are generally classified into two main categories:
- ON – OFF valves though
- Shot-off valves
The first category valves, which are called shut-off valves, are used to cut off and connect the flow with normal operation and operating speed, but the second category valves are called shot-off valves for immediate high-speed shut-off and operation. Made without leaks. Usually these types of valves are located in the path and lines. In case of emergency, they can be opened or closed quickly, and when they operate, they can be switched off or on quickly in the event of an accident.
Types of shut-off valves
- Ball Lion
- Gate or sliding valve
- Disc valve or piston globe valve
- Samovar valve or plug valve
- Diaphragm valve
- Needle milk
- Butterfly valve
Ball valve or wing valve
This type of valve, as its name suggests, has a shell or the main body of the valve in which the ball-like piece is located. The sphere is rotated and the duct inside the ball or sphere is in the same direction as the inlet of the valve and the valve returns or is closed by rotating the spherical part of the duct.
Ball valve is the most abundant valve in the industry, and one of its advantages is the cheapness of this type of valve and its fast operation, which is performed by opening or closing the valve by moving the rotating pyramids 90 degrees.
Between the shutter cutter or the spherical cutter, which rotates or closes the path inside the batz valve and the shell, there is a Teflon type binder that performs a complete shuttering operation.
Samovar valve or plug valve
This type of valve, as its name suggests, is like a samovar valve, a shell or the main body of the valve and a cylindrical or mixed piece that has a duct inside it and moves the valve of the said part with a pyramidal movement, causing it to open or close. Becomes milk.
Gate valve or gate valve
The most abundant valve in the oil and gas industry, in other words, is the processing of this valve. As long as this type of valve operates, the inner diameter of the valve, or in other words, the inner duct of the valve with the inlet pipe, is about the same size. The current passing through the valve acts as a gate in front of the flow and blocks the passage. It is called a gate valve.
This type of valve can only be used to maximize the on-off current when it is fully open, it causes a small pressure drop, but it does not work well to adjust the volume or flow, because when it is half open, it causes disturbance of the flow and The pressure drops, which causes internal damage to the valve, especially the seat and the seal, and eventually leads to internal leakage of the valve.
The size of this valve is relatively large, so it takes up more space than disconnected and connected valves.
A butterfly valve is a type of valve with a rotating action. This type of valve, in addition to switching on and off the flow, also adjusts the amount of flow volume (flow).
The circular disc, which is used as the opening and closing part of the path, is connected to a shaft that is excited by rotating the pyramids and opening or closing it by moving the valve pyramids 90 degrees.
In the diaphragm valve , the blocking part of the path is made of elastic and resilient materials, which are usually reinforced rubber materials, or in other words, rubber layers inside which there are layers of metal mesh or fabric, which in Persian is called rubberized rubber. Becomes.
In some cases, it is made entirely of strong and durable rubber and has no layers of fabric or metal mesh.
The diaphragm is located between the main body of the valve and its cap. Due to the rotation of the valve pulley, the valve stem moves and pushes or pulls the diaphragm towards closing or opening. This type of valve does not need a sealing piece because it cuts its diaphragm in addition to cutting and connecting the sealing path.
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