Industrial Valve
Control Valves
The main role that control valves play is to control fluid flow rate.
Control valves include;
Gate valve
Globe valve
Plug valve
Ball valve
Butterfly valve
Check valve
Diaphragm valve
- Gate Valve
Gate valves control the fluid flow using a metal gate (barrier) in the fluid’s path.
When the valve is fully closed, the gate shuts down completely and with limiting the flow, flow rate can be controlled.
In some gate valves, a handle attached to the stem is used to open and close the gate manually. Stems moves through the middle of a stuffing box positioned on the valve’s cover. Stuffing box is filled with packing and it avoids leakage. Stem is tied to the valve’s handle.
When the valve’s handle rotates anticlockwise, handle and the gate move up and the valve is opened. Rotating the handle clockwise will bring down stem and gate and close the valve.
They are also known as sluice valve.
One look at the valve’s handle and will know whether it is opened or closed.
It is worth noting that gate valves are not usually used for controlling fluid flow, because in the process of fluid control, a considerable amount of pressure is forced on the base of the gate and cause over-corrosion.
Types of gates;
Rigid taper wedge
Flexible wedge
Split wedge or parallel disks valve
There are several bottom rings in gate valves, placed within the valve’s body. The gate fastened in these rings. When the valve is closed, the gate lowers down and is locked between the rings and as such the valve is sealed.
- Globe Valve
In these valves, fluid flow cannot move in a straight path. The bottom of globe valves is parallel to the flow’s direction. Therefore, fluid should deviate its path when crossing the valve.
Globe valves are used for regulating flow in a pipeline. When they are controlling flow, all the disks and bottom rings are under same flow and fluid’s pressure. Thus the amount of corrosion would be identical on all parts of the valve.
There are several types of disks for globe valves. Among them are plug type disk, ball type disk, needle type disk and parabolic type disk.
- Plug Valve
Plug valves are one of the most common industrial valves.
A rotary handle controls the flow in these valves. When valve is opened, fluid runs through plug’s gap.
Rotating the handle for a quarter of a cycle will rotate the plug and close the valve completely.
In order to avoid leakage, it is necessary to connect the valve’s body and plug.
The downside is that connecting the two will result in wearing out and corrosion.
In order to avoid this problem, the valve’s inner housing should be oiled up periodically.
- Ball valve
Ball valves use a hollow, perforated and pivoting ball to control flow through it. It is open when the ball’s hole is in line with the flow and closed when it is pivoted 90-degrees by the valve handle.The handle lies flat in alignment with the flow when open, and is perpendicular to it when closed, making for easy visual confirmation of the valve’s status.
Ball valves are mainly used for opening and closing the flow.
- Butterfly Valve
Butterfly valves isolate or regulate the flow of a fluid. The closing mechanism is a disk that rotates.
When the valve is fully opened, the disk has less resistance towards the flow. Rotating the handle for 90 degrees put the disk fully in the flow’s direction.
Butterfly valves can regulate flow in their 30 degrees’ rotation, so rotating the valve for more than that will release a huge amount of fluid.
They are used for opening, closing and regulating the flow.
- Diaphragm valve
There are no disks or plugs for regulating flow in diaphragm valves. The flow is regulated by a plunger with a flexible diaphragm which moves parallel to the bottom.
In these valves, diaphragm acts as a seal and avoid the fluid to leak in other parts of the valve.
- Check valve
Check valves only allow fluid to flow in one direction. An important concept in check valves is the minimum differential upstream pressure between inlet and outlet at which the valve will operate.
Their main application is in chemical industries, pumps and power plant instruments.
This company offers valves with American brand “Kleev”.
| Catalogs | Products |
| KLEEV | Industrial Valve |