The suitability of a valve for a specific application is defined by the materials used in relation to the transported fluid as well as its mechanical design. Here is Indelac Valve Selection Guide.
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Valve Selection Table
The tables below can be used as a valve selection guide taking into consideration the state of material, its nature and the function of the valve.
Conveyed Fluid
Nature of Fluid
Valve Function
Type of Disc
Liquid Neutral (Water, Oil, etc) On/Off Gate Rotary ball Plug Diaphragm Butterfly Plug gate Control valve, modulating Globe Butterfly Plug gate Diaphragm Needle Corrosive (Acid, alkaline etc.) On/Off Gate Plug gate Rotary ball Plug Diaphragm Butterfly Control valve, modulating Globe Diaphragm Butterfly Plug gate Hygienic (Food, beverages, drugs etc) On/Off Butterfly Diaphragm Control valve, modulating Butterfly Diaphragm Squeeze Pinch Slurry On/Off Rotary ball Butterfly Diaphragm Plug Pinch Squeeze Control valve, modulating Butterfly Diaphragm Squeeze Pinch Gate Fibrous Suspensions On/Off, Control valve, modulating Gate Diaphragm Squeeze Pinch
Conveyed Fluid
Nature of Fluid
Valve Function
Type of Disc
Gas Neutral (Air, Steam etc) On/Off Gate Globe Rotary ball Plug Diaphragm Control valve, modulating Globe Needle Butterfly Diaphragm Gate Corrosive (Acid vapors, chlorine etc.) On/Off Butterfly Rotary ball Diaphragm Plug Control valve, modulating Butterfly Globe Needle Diaphragm Vacuum On/Off Gate Globe Rotary ball Butterfly
Conveyed Fluid
Nature of Fluid
Valve Function
Type of Disc
Solids Abrasive Powder (Silica, etc) On/Off, Control valve, modulating Pinch Squeeze Spiral sock Lubricating powder (graphite, talcum, etc) On/Off, Control valve, modulating Pinch Gate Spiral sock SqueezeValve Type Pros and Cons
Because everything is easier to understand with a table, here is another one summarizing pros and cons for the most common valves.
Valve
Advantages
Disadvantages
Butterfly
Quarter turn
Difficult to clean
Open port
Difficulty with slurries
Used with chemical or corrosive media
Throttling limited to low differential pressure
Compact, lightweight design
Potential for cavitation and choke
Available in large sizes
Unguided disc movement is affected by flow turbulence
Low pressure drop and high-pressure recovery
High coefficient of flow
Ball
Superior ease of operation
Poor throttling characteristics
Maintains and regulates high volume,
Difficult to clean, leads to contamination
high pressure, and high temp flow
Rugged construction and long service life
Low purchase and maintenance cost
Able to function without side loads
Permits inspection and repair of seats and seals without removing the valves' body from the line
Does not require lubrication
Diaphragm
Extremely clean
Can only be used in moderate temperature (-60 to 450ºF)
Leak proof seal
Can only be used in moderate pressures (approximately 300psi)
Tight shut-off
Cannot be used in multi-turn operations
Easy maintenance
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No industry standard face-to-face dimensions
Repairs can be made without interrupting pipe line
The body must be made of corrosive resistant material
Reduce leakage to the environment
Gate
Available in large sizes
Low pressure limitations
Can be used with slurries and viscous liquids
Slow open and close time
Used as a shut off valve
Erosion of the seat and disk can occur
Easy to maintain and disassemble
Poor throttling characteristics
Inexpensive
Difficult to repair
Inherently fire-safe (when used with a metal sheet)
Should not be used in sanitary applications
Bidirectional
Globe
Can be fast-acting
High head loss
Precise control
Large opening for disk assembly
Can be used in high-pressure systems
Heavier than other valves
Cantilevered mounting of the disk to the stem
Low coefficient of flow
Not good for clean or sterile applications
Pinch
Very Clean
Cannot be used in high temperature applications
Excellent drainage
Cannot be used in high pressure applications
Minimal turbulence
Cannot be used with gas media
Low airborne contaminants
Low maintenance
Low weight
Can be used in explosion-proof lines
Inexpensive
Once the right valve has been selected, it is time to select the right actuator! See link below to Indelac Actuator Selection Guide:
Gate valves are a type of valve that is widely used in many different pipeline systems to connect and shut off the flow of the medium. Gate valves are not suitable for regulating the flow of the medium, but they can judge the amount of flow according to the height of the sanitary valve stem. Compared with other types of valves, the gate valve is more versatile and has a wider range of applications for pressure, temperature, and caliber.
There are several different types of gate valves that all serve slightly different purposes in fluid, gas, and slurry processing systems. Gate valves are categorized by their internal framework and by valve stem type.
Gate valves can have four different styles of the internal framework, mostly differing in the type of sealing plate. The four different structures are edge single gate plate type, elastic gate plate type, double gate plate type, and parallel gate plate type.
Gate valves can have two different types of valve stems a rising stem gate valve or a non-rising stem gate valve.
Gate valves are commonly used to control fluids by starting and stopping the medium. They only offer minimal flow regulation, so they are suited to efficiently execute a range of industrial functions. You should consider the pros and cons of gate valves to determine if theyre the right fit for your pipeline system. Lets take an in-depth look at the advantages and disadvantages of gate valves below.
The gate valves body is a straight-through shape that does not alter the flow direction, allowing fluid to pass through the valve (when in the fully open position) with minimal resistance compared to other types of valves.
Gate valves provide better sealing performance than shut-off valves. The gate valves opening and closing mechanisms are faster and more convenient than those of the shut-off valve.
Gate valves are extremely versatile and can be used in applications with mediums like steam, oil, and other media. Plus, gate valves can be used in mediums containing granular solids and with high viscosity. It can also be used as a venting valve and a low vacuum system valve.
Gate valves have dual flow directions. Theyre not limited to one-way flow, nor are they subject to the flow directions of the medium. Therefore, gate valves are suitable for use in pipelines where the flow direction may change. Plus, they are easier to install than other more sophisticated types of valves.
During the opening process, the valve plate needs to be lifted to the upper part of the valve chamber. During the closing process, the valve plate needs to fall into the valve seat. The distance that the valve plate must move in order to open or close is relatively large, leading to a long opening and closing time. This disadvantage makes gate valves impractical for applications that require rapid actuation.
The opening and closing processes between the valve plate and the two sealing surfaces of the valve seat can create excess friction that may lead to scratches on the sealing surface. These scratches might seem innocuous, but eventually, they have an impact on the sealing performance and the service life. These damages are not always easy to repair, but gate valves are easy to install and replace.
Gate valves are usually used to shut off fluid flow completely or provide full flow. Gate valves generally operate in either fully closed or fully open positions. Gate valves only have a few parts, which makes them easy to install. The components of gate valves are a valve body, seat and disc, a spindle, gland, and a wheel for operating the valve.
Thank you for reading our article and we hope it can help you better understand the advantages and disadvantages of gate valves. If you want to learn more about sanitary valves, we would like to advise you to visit the Adamant Valves homepage for more information.