Some Facts About Valves
The word valve is derived from Latin valva, the moving part of a door. In nature there are valves, Eg: heart valves controlling blood circulation. Let us learn about valves.
Fluid generally flows from the direction of higher pressure to a lower pressure in any system. Valves are mechanical devices that can control this flow and alter the pressure of fluids by opening, closing, or partially obstructing the fluid pathways.
Also, known as regulators, they are used widely in industrial processes - in mining, power generation, water supply system, cars, food manufacturing, chemical and plastic manufacturing and many other fields.
Valves vary greatly in size, design, function, and operation. They may be operated manually or be automatic, driven by changes in pressure, temperature, or flow.
Here are some facts about valves:
Valve Function
Valves can perform a variety of functions. The three common valve functions are:
Stopping and starting flow
Eg: Water dispensers. The tap has only 2 options open or closed; and when open there is no flow control option
Throttling (control) flow
Eg: Purge control valve used in cars directs the fuel vapors emitted from the fuel tank to the intake manifold. It also stores and sends the fuel vapors for future combustion when needed. If you’re looking to buy them, compare Purge Valve Cost before deciding on any one seller.
Acting as a non-return check for flow
Eg: Some types of irrigation sprinklers and drip irrigation emitters have small check valves built into them to keep the lines from draining when the system is shut off.
Types of Stainless Steel used in Valves:
Valves are made of many materials. Stainless steel, an alloy of steel and chromium, is one of them as it is strong and has good chemical and corrosion resistance.
If you’re opting for a stainless-steel valve here is a look at some common types:
Austenitic stainless steel:
They contain chromium and nickel and are identified as the 300 series types Eg: SS316. Some characteristics of these are excellent corrosion resistance, good formability and increase in strength during cold.
Ferritic stainless steel
These are straight chromium 400 series. They are magnetic, have good ductility and resistance to corrosion and oxidation.
Martensitic stainless steel
They are identified as straight chromium 400 series and are magnetic. They resist corrosion in mild environment, have good ductility and can be heat treated to high tensile strengths.
Precipitation-hardening stainless steel
These are chromium-nickel types and can be hardened to high strengths by aging and solution treating.
Duplex stainless steel
These are highly resistant to chloride stress corrosion cracking, have excellent corrosion resistance and exhibit twice the yield strength as conventional grades.
Flow Coefficiency:
An important thing to know for selecting a valve is its Flow Coefficient. It is a number that describes the number of gallons that can pass through a valve - in a fully open position - at a pressure drop of 1 PSI.
Knowing the flow coefficient can help you choose the right valve while understanding the effect the valve will have on the pressure in your system.
While buying Purge valves consider these factors and compare Purge Valve Costs before deciding on the product.
If you want to find reputable Quick Exhaust Valve Manufacturers or Purge Valve manufacturers, the author of this article suggests Sealexcel India Private Limited.
Fluid generally flows from the direction of higher pressure to a lower pressure in any system. Valves are mechanical devices that can control this flow and alter the pressure of fluids by opening, closing, or partially obstructing the fluid pathways.
Also, known as regulators, they are used widely in industrial processes - in mining, power generation, water supply system, cars, food manufacturing, chemical and plastic manufacturing and many other fields.
Valves vary greatly in size, design, function, and operation. They may be operated manually or be automatic, driven by changes in pressure, temperature, or flow.
Here are some facts about valves:
Valve Function
Valves can perform a variety of functions. The three common valve functions are:
Stopping and starting flow
Eg: Water dispensers. The tap has only 2 options open or closed; and when open there is no flow control option
Throttling (control) flow
Eg: Purge control valve used in cars directs the fuel vapors emitted from the fuel tank to the intake manifold. It also stores and sends the fuel vapors for future combustion when needed. If you’re looking to buy them, compare Purge Valve Cost before deciding on any one seller.
Acting as a non-return check for flow
Eg: Some types of irrigation sprinklers and drip irrigation emitters have small check valves built into them to keep the lines from draining when the system is shut off.
Types of Stainless Steel used in Valves:
Valves are made of many materials. Stainless steel, an alloy of steel and chromium, is one of them as it is strong and has good chemical and corrosion resistance.
If you’re opting for a stainless-steel valve here is a look at some common types:
Austenitic stainless steel:
They contain chromium and nickel and are identified as the 300 series types Eg: SS316. Some characteristics of these are excellent corrosion resistance, good formability and increase in strength during cold.
Ferritic stainless steel
These are straight chromium 400 series. They are magnetic, have good ductility and resistance to corrosion and oxidation.
Martensitic stainless steel
They are identified as straight chromium 400 series and are magnetic. They resist corrosion in mild environment, have good ductility and can be heat treated to high tensile strengths.
Precipitation-hardening stainless steel
These are chromium-nickel types and can be hardened to high strengths by aging and solution treating.
Duplex stainless steel
These are highly resistant to chloride stress corrosion cracking, have excellent corrosion resistance and exhibit twice the yield strength as conventional grades.
Flow Coefficiency:
An important thing to know for selecting a valve is its Flow Coefficient. It is a number that describes the number of gallons that can pass through a valve - in a fully open position - at a pressure drop of 1 PSI.
Knowing the flow coefficient can help you choose the right valve while understanding the effect the valve will have on the pressure in your system.
While buying Purge valves consider these factors and compare Purge Valve Costs before deciding on the product.
If you want to find reputable Quick Exhaust Valve Manufacturers or Purge Valve manufacturers, the author of this article suggests Sealexcel India Private Limited.
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