Types of valves

Valves

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Valve is a mechanical device used to control the flow direction of the fluid (liquid, solids, gases, fluidizers, slurries) and pressure in a system. In the open valves system the direction of the fluid is always passes from high pressure to low pressure.

Types of the valves:

Check valve, Hydraulic valve, Pneumatic valve, Manual valve, Solenoid valve, Motor valve, Aerosol valves, air logic valves, balancing valves, ball valves, blind valves. Butterfly valves, cartridge valves, casing valves, Christmas tree valves, cock valves, control valves, diaphragm valves, dis valves, faucet valves, gate valves, globe valves, hydraulic valves, needle valves, pinch valves, piston valves, plug valves, poppet valves, relief valves, rotary valves.

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Check valves:

Check valves are the ancient type of valves. By using the check valves we can send the fluid in one direction only. It consists of two openings in the body one is used for entering the fluid and the other is used for leaving the fluid. Check valves are also divided in to 8 types they are

  • Ball check valves
  • Diaphragm check valves
  • Swing check valves or tilting disc check valves
  • Stop check valves
  • Lift check valve
  • In line check valve
  • Duck bill valve
  • Pneumatic non return valve

Hydraulic valve

Hydraulic valve is an electro – mechanical or mechanical device used to control the flow of the fluid in the hydraulic fluid system. The hydraulic drives are operated with the help of hand in the mobile system and activated electrically in the fixed system. At the time of manufacturing process it includes the specifications like pressure rate, actuator type, number of ports, configuration of the ports, valve type, connections of port, material used for construction.

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Types of hydraulic valves

  • Directional control valves
  • Pressure control valves
  • Flow control valve
  • Electro hydraulic valve

Advantages of hydraulic valve

  • Supplied energy does not transfer to the liquid
  • Due to incompressibility the hydraulic drive provides high forces and also having the capability of bearing high loads.
  • Incompressibility of the working fluid leads to the minimum spring action
  • The flow of the fluid is stopped at that case the load pressure was released
  • Pressurized air is used to release the pressure load.

Pneumatic valve

Pneumatic valves are the responsible for the air intake and pressure rate in the pneumatic system. Power is transmitted when the force was applied on the air or compressed the air. Different types of the pneumatic valves are used in the device.

Pneumatic valves are divided in to 5 types

  • Two way directional valve
  • Three way directional valve
  • Four way directional valve
  • Spring offset
  • Two way directional spring off set

Advantages of pneumatic valves:

  • Design of the pneumatic value is simple and easy to control
  • Maintenance is less compared to others
  • We can see long operating lives
  • Shock damage is less in the equipment because of gas compression

Solenoid valve

Electro mechanical operated value is present in the solenoid valve. The valve is controlled with the help of electric current. The value consists of two port flow and three port flow.

  • We can see on and off conditions of the fluid flow in the two port valve
  • In the three port valve the flow of the fluid is exchanged between the two outlet ports.

Solenoid valves are commonly used control components in fluidics. They are used to release, shut off, mix fluids, distributes the fluids.

Solenoid force (F_s)

F_s=PA=P\pi d^2/4

Types of solenoid valves:

  • Alternate current or direct current
  • One or two solenoid valves
  • Different number of position and ways

Advantages:

They provide safe and fast interchanging, long service life, good compatibility, compact design; power control must be low, high reliability and long service life.

Aerosol valves

It is a mechanical device used to control the flow rate with the help of the valve. The valve consists of channels and small holes. At the time of manufacturing process it includes the specification like type of construction material, type of actuator, valve size, output type. Valves give out the liquids, cleaning agents, creams, ointment and some more products packed in aerosol can.

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Air logic valves

It is an electro mechanical or mechanical device. These valves are used to control the air flow in the pneumatic system. In case of electrical components these valves are used in electrical control at hazardous atmosphere. At the time of manufacturing process it includes the specification like input voltage, number of ports, pressure ranging, switching speed, construction material used actuator used and thread size of the port.

2

Balancing valves

It is a mechanical device used to control the flow of the fluid. With the help of the valve the fluid pass is divided into multiple flows. At the time of manufacturing process it includes the specification like valve size, type of construction material used, number of ports, and connection of ports. The balancing valves are mainly used in the application of fluid power systems and HVAC applications. Mainly the balancing valves are used in cooling systems, commercial heating, at varying loads the temperature of the water is adjusted. In double acting cylinder they provide the counter balancing forces.

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Ball Valves

It is a mechanical device used to control the flow of the fluid in pipes and tubes. The valve consists of a ported sphere that rotates in the pipe stream to allow or block the flow of the fluid. At the time of manufacturing process it includes the specification like material that used to manufacture the body of the valve, number of ports are placed on the valve, port configuration, connections of port, size of the valve, and steam packing in water supplying pipes and compressed air lines ball vales are used to shut off the flow of the liquid.

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Blind valves

It is a mechanical device used to stop the flow of the fluid in pipe lines. Mainly the blind valves are used in the gas and oil industries to divide the pipe line section. At the time of manufacturing process it includes the specification like valve size, valve type, port connections, type of actuator used, material used for the manufacturing of the valves, lining and seal agent. These valves are commonly used in the off shore regions and in ships. We can see that whether the pipe is in open state or in a closed state.

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Butterfly valves

It is a mechanical device used to control the flow of the fluid through the pipe lines. Circular shaped tap was mounted at the center of valve to flow stream inside and outside. At the time of manufacturing process, it includes the specification like seal, steam packing, disc, port connections, material used for the manufacture of the valve body. These valves are commonly used in the power plants, waste water plants, regulating and separation of fluid.

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Cartridge valves

It is a mechanical device used to control the flow in the pneumatic and hydraulic fluid system. At the time of manufacturing process it includes the specification like lining, seal, material used in the manufacture of the valve body, actuator type, valve size and number of ports. These valves are used in the flow control system, logic, motor control, directional control, pressure control etc.

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Casing valves

It is a mechanical device used in the gas and oil industry to provide well casing. At the time of manufacturing process it includes the specification like actuator type, valve type and size, material used for the manufacture of the valve body.

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Christmas tree valves

It is a mechanical device used for flow controlling of fluid in the gas and oil industries. At the time of manufacturing it includes the specification like pressure rating, number of ports etc.

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Cock valves

It is a mechanical device used for void containers. The valve consists of threads are used for closing and opening purpose. They are used for the low pressure lock out. At the time of manufacturing process it includes the specification like port connections, construction material used, valve size. Cock valves are used in the heaters, glass ware, boilers, air system, tankers, radiators and drums.

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Control valves

It is an electro mechanical or mechanical device used to control the flow of the fluid or air. At the time of manufacturing it includes the specification like actuators type, material used for the manufacturing of the valve, construction of the material, valve size. Controlling methods (   rotary or linear) control valves are used in the chemical processing, irrigation and water system, cooling and heating system. Control valves have the ability of high and low temperatures, along with the high and low capacity of control. These valves are also used in the cryogenic and laboratory applications.

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Diaphragm valves

It is a mechanical device used in the pipe to close the flow of the liquid. At the time of manufacturing few factors are taken into consideration like the port connections, seal material, valve size, and media. These valves are mainly used in the semi-conductor industries, pharmaceutical, food and cosmetics.

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Disc valves

It is a mechanical device used to control the flow of fluid in the pipes. The valve consists of round shaped flat plate which was mounted at the entrance of the pipe with an angle of 45 degrees to the longitudinal axis. These types of valves are mainly found in the food processing industries. At the time of manufacturing they are considering some factors like construction of the material, port connections, and valve type and size. These valves are used in the dairy institutes, food industries, and pharmaceutical to ‘OFF’ the flow of the fluid, power or food wastage where public health is critical issue.

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Faucet valves

It is a mechanical device used for the controlling fluid flow in to a sink, drum or basin. At the time of manufacturing few factor are to be considered like the valve type, valve size, port connections, seal, lining, and manufacturing material of valve. These types of valves are used in the kitchens laboratories and bathrooms.

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Gate valves

It is a mechanical device used for the controlling fluid flow in pipes. There is a plate arrangement in the valve it acts like a well to reduce or stop the flow of the fluid. At the time of manufacturing they are considering some factors like sealing agent, lining, material that used in the manufacturing of valve body. Mainly the gate valves are used to on or off the valves in the process plants, waste water plant, and power plant.

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Globe valves

Globe valves are mechanical device used to control the fluid flow in pipes. The globe valve is operated with the hand wheel to close and open the flow of the fluid. In the process of manufacture few factors are taken into consideration like steam packing, valve type, and port connections. These valves are used in process plants, food processing unit and waste water plants.

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Needle valves

Needle valves are mechanical devise. They help the fluid into the ports or tubes. In the process of manufacture few factors are taken into consideration like port connections, seal, lining, valve body and steam packing.

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Pinch valves

It is a mechanical device used to control the flow of the fluid and dry products flow though the pipes. At the time of manufacturing they are considering some factors like material used and valve size. These pipe valves are used to transmit the products in the industries like food slurries, sand, gravel, and dry products.

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Piston valves

It is a mechanical device used to control the fluid flow in pipes. Cylindrical plug is arranged in the piston to close the flow through the valve. In the process of manufacture few factors are taken into consideration like seal, lining, valve body material, and stem packing.

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Plug valves

It is a mechanical device used to control the fluid flow in pipes. There is an arrangement of ported plug rather than ported ball in the plug valve. In the process of manufacture few factors are taken into consideration like seal, stem packing, valve size, valve type and material used for the valve body. Most of the cases the plug valves are used in the waste water treatment and chemical plants.

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Poppet valves

It is an electro mechanical or chemical device used to control the flow of the fluid in the pneumatic cylinders. An apparatus named as poppet that is a movable part used to flow the fluid or gas directly into the valve body. Poppet valves are also called as the engine valves. In the process of manufacture few factors are taken into consideration like pressure rating, valve type, and flow coefficient, construction of the material and valve size. We can see the poppet valves in the air dryers, steam engines and in pneumatic systems.

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Relief valves

It is a mechanical device used to protect the system like piping or boilers from over pressure. In the over pressure state the relief valve is used. In the process of manufacture few factors are taken into consideration like pressure rating, valve size and type, port connections and construction of the material. These are operated automatically.

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Rotary valves

It is a mechanical device used to control the flow of the products and dry powders. With the help of the reducer or motor, the product is rotated through the valve. In the process of manufacture few factors are taken into consideration like valve size and shape, material used for construction in duct collectors and conveying system rotary valves. They are widely used in the chemicals, handling minerals and in pellets.

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