What are the different types of valves?

 The function of a valve is to control the flow of water and to stop it. It is present in industrial environments, even in our homes. This valve brings together many technical characteristics necessary for the various uses to which it is put.

The function of the valve is roughly divided into three: "stop the flow", "fix the flow direction" and "adjust the flow rate and pressure". We will introduce the types and characteristics of valves as a guide for selection to exert these functions.

 

Butterfly valve

Butterfly valves are used for water, hot water, oil, air, steam, slurry, etc.

The lever is rotated to rotate the valve stem, and the valve body connected to the valve stem turns to control the fluid.

A highly versatile valve that can be used for both ON-OFF and fluid adjustment.

Brass Ball Valves

When to use a butterfly valve?

The butterfly valve is mainly used to control the flow of a fluid. On the other hand, the butterfly valve cannot be used for liquids loaded with solid particles, which could prevent its total closure.

The Hastelloy Valves are quarter-turn valve. Its actuation requires a 90 ° rotation between the open position and the closed position. For large diameters, it may require an actuation system equipped with a reduction gear which compensates for the pressure exerted directly on the throttle.

Pros

Relatively low-pressure loss when fully opened.

Opening/closing torque is small.

Fully open/fully closed operation can be done by rotating the valve stem 90°, so operability is good.

Gate valve

The gate valve is used for water, hot water, oil, slurry, etc. The handle wheel is rotated to move the valve rod up and down. The valve body connected to the valve rod moves up and down to control the fluid.

When used at an intermediate opening, vibration and erosion (erosion) occur in the Brass Valves body and the downstream piping. It is normally used only with ON-OFF.

Pros

Very low-pressure loss when fully opened.

Suitable for a wide range of sizes from small to large.

Globe valve

Globe valves are used for water, oil, air, steam, etc. The handlebar is rotated to move the valve rod up and down, and the valve body connected to the valve rod moves up and down to control the fluid.

Due to the structure, the fluid resistance is very large, and the valve rod receives the total pressure of the fluid at the time of closing. The closing torque is large, but since it can be used at an intermediate opening, it is mainly used for the flow rate adjustment.

Pros

Flow rate can be adjusted.

Ball valve

Ball valves are used for water, hot water, oil, air, etc. The lever is turned to rotate the valve stem. A ball having a through-hole connected to the Inconel 600 Tube Fittings valve stem is rotated to control the fluid.

When used at an intermediate opening, the fluid tends to collect between the body and the ball. It is usually used only when it is turned on and off.

Pros

Very low-pressure loss when fully opened.

The valve rod can be fully opened and fully closed by rotating it 90°, so it has good operability.

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