Types of valves

Gate valve
is used to control the flow. It has the characteristics of fully open/fully closed (On-Off) and can select the flow direction from left to right or from right to left. It is suitable for use in the main open/close type.
The highlights of the gate are:
1. Easy to install
2. There is a low pressure drop across the valve because the gate allows the flow to pass through without changing the flow direction of the flow.
3. It can be used in high pressure and high temperature applications. It can be used with both liquid and gas fluids.
4. It has good sealing efficiency. It is used as a valve to cut off the system.
5. It can be used in the pipeline system where the flow direction may change.
Precautions for using the gate

Not suitable for fluids with suspended solids or powder fluids. When opening and closing the valve, there will be friction between the valve tongue (Disc) and the sealing surface of the valve seat (Seat), causing the sealing surface to be scratched, which will affect the service life and sealing efficiency of the valve in the future.

Globe valve
is used to control the flow. It is used to adjust the flow rate of the fluid. And it can be used in fully open-fully closed (On-Off) mode. The flow direction of the globe valve can be observed from the arrow on the valve. When installing, it must always be facing the same direction as the fluid.
The highlights of the globe valve are:
1. Can adjust the flow rate well.
2. The valve structure is very strong.
3. Can be used in high pressure and high temperature applications. For both liquid and gas fluids.
4. Can be used as an automatic control valve (Control Valves) if the valve tongue is properly designed.
Precautions for using globe valves There is
a high pressure drop across the valve and the fluid flowing out of the valve is turbulent. Not suitable for very viscous muddy fluids or powdery fluids. The solid powder stuck between the valve tongue (Disc) and valve seat (Seat) from pressing the tongue and valve seat down is heavy. Therefore, it affects the structural design. Not suitable for use with fluids that require cleanliness or are free from contaminants. Since the use of globe valves has a chance of accumulating residue inside the valve,

check valves (CHECK VALVE)
function to prevent the backflow of fluid (Back Flow Prevention) to prevent damage to equipment such as water pumps caused by fluid flowing back in the original direction. Check valves can be divided into 3 main types that are commonly used:
1. Swing Check Valve has a hinged valve tongue. The hinge opens when water flows through and closes when water flows back. Or if there is no fluid in the system, the valve tongue will close due to gravity. There is a low pressure drop across the valve. It can be installed both horizontally and vertically (in the direction of flow up only). The valve size is from 2 inches and up.
2. Lift Check Valve has an up-down valve type. The valve tongue will lift when water flows through and will close when the pressure in the pipe decreases or there is no flow in the system. There is a high pressure drop across the valve body. It can be installed horizontally only (in the case of no spring push). If there is a spring push, it can be installed both horizontally and vertically. It should be used with low viscosity fluids. Most valve sizes are not more than 2 inches.
3. Wafer Check Valve has a hinged valve type. The hinge opens when water flows through (in the specified direction) and closes when the water flows back. Or if there is no flow in the system, the valve tongue will close according to the pressure of the spring. The structure is designed to be smaller and less wide (compared to swing check valves, lift check valves), making it lightweight, reducing the weight on the pipe when installing. It has a low pressure drop, saves space and is easy to install. The valve size is 2 inches or more.
Precautions for using check valves
For swing check valves, there will be a loud noise when the valve tongue hits the valve seat while the valve tongue is closing, and there is a chance of damage. There may be leakage if the fluid is contaminated with sediment or dirt.

Ball valves
control the flow. They are used in fully open/fully closed (On-Off) mode. They are suitable for applications that require frequent opening and closing. They can be used by turning the valve stem only 90 degrees (Quarter-Tern). They are not suitable for applications that require adjusting the flow rate.
The highlights of ball valves are:
1. They can be opened and closed quickly by simply turning the valve stem 90 degrees. They are very suitable for applications that require frequent opening and closing.
2. The pressure drop across the valve is low.
3. They can completely and quickly shut off the flow of fluid. They are used as emergency relief valves
4. They can be used with both liquid and gas fluids.
5. They have good sealing efficiency. They are used as valves to separate systems.
Precautions for using ball valves:
They are not suitable for applications with very high temperatures or applications with fluids that contain dirt or sediment. This may cause marks on the seat or ball, leading to future leaks. The ball seat must always be selected to suit the operating temperature and pressure.

Butterfly valves
control the flow. They are used to adjust the flow rate of the fluid. Suitable for use as an on-off valve with a straight flow of fluid. There will be only a valve tongue blocking the flow.
The advantages of butterfly valves are:
1. Easy to open-close and can control the flow rate.
2. Simple structure, thin and light design.
3. Uses less installation space than other types of valves.
4. Easy to install and easy to maintain.
Precautions for using butterfly valves
Not suitable for use with high pressure and requiring detailed flow rate control. Because the seat will collide with the fluid all the time. It may cause the seat to wear out quickly and cause leakage.