Manual Valve

Introduction of Manual Valve

Manual valve are control valves that adjusts liquid fluids in a pipe. In general, the manual valves are operated by human power. In other words, they should be operated by technicians.

The controller of the manual valve can be a handwheel or a hand lever. In common using, the manual valve would be placed in a mid-stroke position.

Being one of the members in control valve family, the manual valves are designed as an on-off valve and are mainly used to stop the pressure drip and reach the purpose of throttling.

Manual valves are designed in different types and forms. However, the working concept and purpose is the same. All of them contain a controller that can adjust the liquid flow, and their purposes of operating are pressure drip prevention.


Types of Manual Valve

Ball valve
Ball valve is a kind of valve that use a hollow round part to control the liquid flow.

Inside the ball valve, there is a sphere part which controls the liquid flow through the valve. The sphere part has a hole in the middle and the whole sphere part is spinnable. Whether the valve should be opened or closed are controlled by the valve handle.

When the valve is opened, that means it links the two sides inside a tube with the hollow surface. Thus, the liquid would be able to flow through the tube and go to the place it should go.

On the other hand, when the valve is turned 90 degree, the surface without any holes will stock both sides of the tube and stop the liquid flow.

Rotating Valve
Rotating valve works like the ball valve. However, the gate inside the tube is a cylinder with a hole through the middle of the cylinder. The cylinder would be placed vertical in the tube. When the hand lever is twisted, the direction of the cylinder would be parallelly changed.

When the hole is vertical to the direction liquid flow, the flow is allowed to pass through the cylinder and go through the pipe. If the hole is parallel to the direction of liquid flow, the flow would be stopped in front of the cylinder.

Stopper Valve (Globe Valve)
The stopper valve is as known as globe valve. Inside the stopper valve, there is a right angle turn under or above the closure element.

When the technician twists the handle to work the globe valve, the washer would be lower and lower. In the end, the washer would plug in the path of the right angle and stop or adjust the liquid flow.

Sliding Valve (Gate Valve)
The sliding valve is also called the gate valve. There is a closure element inside the valve functions like a gate.

When the technician operates the valve, the gate would be closed and stop the liquid flow. On the other hand, when the technician releases the valve, the liquid would be allowed to flow through the pipe. Whether the flow would be a stream or be larger are decided by the height of the closure element.

Flexible Valve (Diaphragm Valve)
Diaphragm valve can be recognized as one kind of shut-off valves. It can stop liquid flow by directly block the liquid flow’s path.

Inside the valve, there would be a diaphragm on the upside of the tube. The material of the diaphragm should be elastic, corrosion-resistant, and non-permeable. Thus, it is usually made of plastic and rubbers.

When the liquid flow is necessary to be stop, the user can spin the handwheel to add pressure on the diaphragm and force it to extend and block the flow of the liquid inside the tube. Thus, the lower stream in the tube would be emptied since there would not be liquid pass through.

Butterfly Valve
The working principle of butterfly valves is similar to the one works ball valves.

While the ball valves stop liquid flow by hollow ball parts, the butterfly valves use discs to stop the flow.

When using the butterfly valves, the users can spin the axis to control the flow in the tube. When the disc is parallel to the flowing direction of the liquid, the flow would be smooth and no obstacles on its way.

However, when the disc becomes vertical to the flowing direction, it will totally cover the path in the tube and stop the flow before the disc.


Applications of Manual Valve

Manual valves can be used in various industries, or even in families. They are installed in all the equipment or devices, usually pipes or tubes, to work as a control valve.

Generally, they would be made by metals to meet the sanitary standard. Thus, they would be applied in more industries, especially industries that requires to be germ-free during the procedure.

Below are industries that might adopt sanitary ball valve during the process:
● Dairy Processing
● Food and Beverage Processing
● Brewing, Wine and Spirits Making
● Sterilizing Equipment Manufacturing
● Pharmaceutical Processing
● Medical Related Products Manufacturing
● Chemical Processing
● Fragrance and Cosmetics Making

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