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what is an automatic expansion valve

by Prof. Korbin Schmidt Published 4 years ago Updated 3 years ago

automatic expansion

  • TXVS. Function:The thermostatic expansion valve is a metering device. ...
  • AXVS. Function:The constant pressure or automatic expansion valve responds to outlet pressure. ...
  • Applications. Many oem’s apply TXVs in applications where it may be possible to use an AXV. ...

automatic expansion valve. A valve designed to maintain a constant pressure in the evaporator and to meter the refrigerant by using a pressure sensing device. Also called a constant pressure expansion valve.

Full Answer

What is the working principle of expansion valve?

  • Working Principle of Thermostatic Expansion Valve. ...
  • Construction of Thermostatic Expansion Valve. ...
  • Working of Thermostatic Expansion Valve. ...
  • Applications of Thermostatic Expansion Valve. ...
  • Advantages of Thermostatic Expansion Valve. ...
  • Disadvantages of Thermostatic Expansion Valve. ...

How to install AC compressor and expansion valve?

to change the valve. It is more efficient to change the TXV as part of the compressor renewal. Remember that an AC system MUST be clean for the compressor and other components to function properly. Any debris or contamination at the TXV can prevent proper flow of lubricating oil through the system and its return to the compressor.

How to install an automatic fill valve?

How To:Install an automatic fill valve. Install an automatic fill valve. Having a beautiful waterfall in your outside area, is a great way to add a relaxing feature to your landscape. But a common problem with them is that during the long hot summer months, water tends to evaporate and this causes the water in waterfalls and ponds to dissapear.

Do I replace the expansion valve?

Unless the compressor failed internally, sending debris/burnt oil throughout the AC system, the expansion valve doesn’t require replacement. couldn’t find a clutch for it

How does an automatic expansion valve work?

In the automatic expansion valve, the spring pressure along with the atmospheric pressure acts on the diaphragm and pushes it down. As a result, the needle also tends to move down away from the seat leading to the opening of the valve. The evaporator pressure pushes the diaphragm in an upward direction.

What is the purpose of the expansion valve?

The expansion valve removes pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. The high-pressure liquid refrigerant entering the expansion valve is quite warm. This may be verified by feeling the liquid line at its connection to the expansion valve.

Why is automatic expansion valve not used?

It should only be used on systems with a fairly constant heat load. Because it does not control the amount of superheat at the outlet of the evaporator, it does not work well on systems with dramatic changes in heat loads.

Which pressures use automatic expansion valve?

Function:The constant pressure or automatic expansion valve responds to outlet pressure. It meters liquid refrigerant to the evaporator, maintaining a constant evaporator pressure. Refrigerant flows at a rate that exactly matches compressor capacity. A typical AXV is shown in Figure 3.

Where is an expansion valve located?

The expansion valve is situated in the liquid line between the condenser and the inlet of the evaporator. It operates on the opposite side of the system, relative to the compressor.

What are the 4 types of expansion valve?

What are the Different Types of Expansion Valves?Thermal Expansion Valves (TEVs)Manual Valves.Capillary Tubes.Automatic Valves.Electronic Expansion Valves.Float Valves.

What's the advantage of a TEV over an automatic expansion valve AEV )?

Advantages of the Thermostatic Expansion Valve The TEV keeps the evaporator fully active and helps getting the optimum cooling effect from it. Since the entire refrigerant in the evaporator gets vaporized the chances of the liquid refrigerant particles going to the compressor are reduced.

What two pressures control the operation of an automatic expansion valve?

What two pressures control the operation of an automatic expansion valve? Spring and evaporator pressures.

When the evaporator pressure drops the automatic expansion valve will?

When the evaporator pressure drops, the automatic expansion valve will open to allow more refrigerant to enter the evaporator. 19.

How do I adjust my AC expansion valve?

18:0321:04Why and How to Adjust a TXV / TEV - YouTubeYouTubeStart of suggested clipEnd of suggested clipSo that you can think of it that way in reality you're just turning it clockwise or counterclockwiseMoreSo that you can think of it that way in reality you're just turning it clockwise or counterclockwise. Counterclockwise allows more refrigerant to flow through.

Construction of Automatic Expansion Valve

The automatic expansion valve consists of a needle valve and a seat (which forms an orifice), a metallic diaphragm or bellows, spring and an adjusting screw. Refer Fig. 1. The opening and closing of the valve with respect to the seat depends upon the following two opposing forces acting on the diaphragm:

Working of Automatic Expansion Valve

Due to decrease in evaporator pæssure, P E will be less than P S. Therefore, diaphragm will move downwards, causing the valve to open. This allows more liquid refrigerant to enter into the evaporator and thus increasing the evaporator pressure, till the desired evaporator pressure is reached.

Limitations of Automatic Expansion Valve

Automatic expansion valve is not used in actual practice or engineering applications due to following two major limitations.

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What is a constant pressure expansion valve?

The constant pressure expansion valve keeps the pressure inside the evaporator constant, hence the name. The constant pressure valve maintains constant pressure inside the evaporator no matter what the load inside the evaporator is. It does not allow the control of the flow of the refrigerant through it even when lesser or more refrigerant is ...

What is the opening in a condenser valve?

There are also two opening in the valve. From one side the refrigerant from the condenser enters the constant pressure expansion valve and from the other side the refrigerant leaves the valve to enter the evaporator.

How does a constant pressure valve work in a refrigeration plant?

This means that the evaporator pressure can be varied by changing the position of the spring. When the refrigeration plant with the constant pressure valve is stopped, certain amount of the refrigerant remains inside the evaporator and create pressure inside the evaporator. This pressure acts against the diaphragm and keeps the valve closed.

How does a seat valve work?

The opening in the seat is controlled by the needle or stem connected to the diaphragm. As the diaphragm moves down the needle also moves down thus opening the valve. The the seat and the needle form the orifice for the constant pressure valve. There are also two opening in the valve.

What causes the diaphragm to move down?

The spring above the diaphragm is under compression thus the spring pressure along with the atmospheric pressure acts on the diaphragm. Due to the pressure the diaphragm tends to move down due to which the needle also tends to move down away from the seat leading to the opening of the valve.

When the load on an evaporator is high, does it allow more flow of the refrigerant?

When the load on evaporator is high it won’t allow more flow of the refrigerant as per the requirement. Similarly, when the load is lesser, it won’t allow reduction of the flow of the refrigerant as per the requirement. Thus the constant pressure expansion valve does not allow the control of the flow of the refrigerant through it which is very ...

Which direction does the evaporator pressure move?

Below the diaphragm there is refrigerant at the evaporator pressure thus the evaporator pressure tends to move the diaphragm in the upward direction. Due to this the needle tends to move in the upward direction towards the seat to close the valve. Thus the spring pressure and the evaporator pressure act against each other ...

What is a hand expansion valve?

The hand expansion valve is normally used as a supplementary safety valve installed in a bypass line. It is also commonly used to control the flow rate through oil bleeder lines.

Why are expansion valves so popular?

These types of expansion valves are popular due to their simplicity and availability, and their relatively good sensitivity and accuracy in regulation. The large choice of expansion valve sizes and bulb charges means the capacity and temperature ranges are very good.

What is a low side float valve?

Float Valves. The Float Valve operates by a float immersed in the liquid refrigerant. Both low-side float and high side-float are devices used to control the flow of liquid refrigerant. The low-side float valve helps maintain a constant level of liquid refrigerant in the evaporator. It opens when there is no liquid in the evaporator ...

What is a TEV valve?

A thermal expansion valve or thermostatic expansion valve (often abbreviated as TEV, TXV, or TX valve) is a device that controls the amount of refrigerant released into the evaporator and is intended to regulate the superheat of the vapor leaving the evaporator. Although often described as a “thermostatic” valve, an expansion valve does not regulate temperature; the temperature of the evaporator will vary with the evaporation pressure.

How does an EEV work?

The electronic expansion valve (EEV) operates with a much more sophisticated design. These types of expansion valves control the flow of refrigerant entering a direct expansion evaporator. They do this in response to signals sent to them by an electronic controller. A small motor is used to open and close the valve port that is called a step or a stepper motor. Step motors do not rotate continuously; they are controlled by an electronic controller and rotate a fraction of a revolution for each signal sent to them by the electronic controller. The step motor is driven by a gear train, which positions a pin in a port in which refrigerant flows.

What is a floating valve?

Float Valves. Expansion valves are devices used to control the refrigerant flow in a refrigeration system. They remove pressure from the liquid refrigerant to allow expansion or change of state from a liquid to a vapor in the evaporator. Expansion valves serve two purposes: controlling the amount of refrigerant entering ...

What controls the mass flow of refrigerant entering the evaporator?

Movement of the membrane controls the position of a needle and hence the mass flow of refrigerant entering the evaporator. 2. Manual Valves. These types of expansion valves are manually operated needle valves. The needle position is fixed, and the mass flow through it depends on the pressure difference across the valve.

What is the purpose of expansion valves?

So basically expansion valves help to change the higher pressure of the liquid refrigerant in the condensing unit to a low-pressure gas refrigerant in the evaporator. The term low side is used to indicate the part of the system that operates under low pressure and the term high side is to indicate the part of the system ...

What is a constant pressure expansion valve?

This type of valve is also called a constant pressure expansion valve due to its ability to maintain constant evaporator pressure. Mostly this type of expansion valves is used with dry expansion evaporators where the load is constant. This valve consists of a needle valve and a seat metallic diaphragm or a bellow, spring, and an adjusting screw. The opening and closing of the valve are dependent upon the opposing forces which act on a diaphragm. The spring pressure and the atmospheric pressure acts on the top of the diaphragm and the evaporator pressure would act below the diaphragm. So when the compressor is running the valve would maintain an evaporator pressure in equilibrium with the spring pressure and the atmospheric pressure.

What is a constant superheat valve?

These valves are also known as a constant superheat valve because they can maintain a constant superheat of vapor refrigerant at the end of the evaporator coil by providing the proper flow of the refrigerant to the evaporator. The major components of this valve is a diaphragm, seat, needle valve, and also an adjusting screw.

Why does the diaphragm move upwards when the evaporator pressure rises?

If the evaporator pressure rises the diaphragm would move upwards in order to reduce the valve opening. Thermostatic expansion valves. A thermostatic expansion valve is the most ...

How does a spring valve work?

The spring pressure can be varied by adjusting the tension of the spring with the help of the spring adjusting screw. So if the spring is adjusted for the desired evaporator pressure then the valve would operate automatically to maintain a constant evaporator pressure by controlling the flow of refrigerant to the evaporator.

What forces are used to close a valve?

The opening and closing of the valve are depended upon the forces that act on the diaphragm. These forces are the spring pressure which acts on the diaphragm’s bottom, then the evaporator pressure which also acts on the diaphragm ’s bottom, and the feeler bulb pressure which acts on the top of the diaphragm. The feeler bulb is installed in the ...

How does an expansion valve detect a high pressure liquid?

The expansion valve would detect this by feeling the liquid line at its connection to the expansion valve. The liquid refrigerant that leaves the expansion valve will be cold. The orifice in the valve does not remove the heat but it will reduce the pressure.

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What is constant pressure expansion valve?

Constant-pressure expansion valves can also be used in place of or in parallel with capillary tubes in air conditioning applications. At low-load conditions, the AXV maintains a higher suction pressure, thus preventing coil freeze-up.

What is a flat steel diaphragm?

The flat steel diaphragm provides a smooth stroke without “snap.”. The stainless steel piston assembly uses an o-ring packing compound for refrigerant use. The element is protected from any system contaminants by virtue of the piston seal on the power piston.

Can OEM use AXV?

Many oem’s apply TXVs in applications where it may be possible to use an AXV. If the application has a fairly constant load, such as a flaked ice machine or water cooler that is installed in a conditioned environment, an AXV can often be used in place of a TXV.

Do AXVs measure suction temperature?

Since AXVs control evaporator pressure, it is not necessary to measure suction temperature when installing the valve. Simply adjust the range spring until the desired evaporator pressure is reached. If the service technician is unsure of the needed evaporator pressure, then measuring suction temperature is necessary.

Is the TXV more efficient?

The TXV is capable of producing more ice and it is more efficient ; however, the reduction in ice capacity at the 70/50 condition is only 3.5% and the reduction in efficiency is only 4.2%.

Does AXV reduce suction pressure?

Additionally, at higher load conditions, the AXV maintains a lower suction pressure, thus reducing power consumption and protecting the compressor against overload. Also, since the AXV maintains a constant suction pressure, this results in more efficient compressor operation.

image

Constant Pressure Expansion Valve Or Automatic Expansion Valve

Image
The constant pressure expansion valve keeps the pressure inside the evaporator constant, hence the name. The constant pressure valve maintains constant pressure inside the evaporator no matter what the load inside the evaporator is. It does not allow the control of the flow of the refrigerant through it even when less…
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Construction of The Constant Pressure Valve

  • The constructional details of the constant pressure expansion valve are shown in the figure above. It comprises of the metallic body inside which is the metallic diaphragm or bellow. On the upper side of the diaphragm is the spring which is under pressure and its pressure is controlled by the adjusting screw. Below the diaphragm there is thin plate or seat that has the small opening. …
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How The Constant Pressure Expansion Valve Works?

  • The spring above the diaphragm is under compression thus the spring pressure along with the atmospheric pressure acts on the diaphragm. Due to the pressure the diaphragm tends to move down due to which the needle also tends to move down away from the seat leading to the opening of the valve. Below the diaphragm there is refrigerant at the evaporator pressure thus the evapor…
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Limitations of The Constant Pressure Expansion Valve

  • The main aim of the constant pressure expansion valve is to maintain constant pressure inside the evaporator no matter what the refrigeration load inside the evaporator is. When the load on evaporator is high it won’t allow more flow of the refrigerant as per the requirement. Similarly, when the load is lesser, it won’t allow reduction of the flow of the refrigerant as per the requirem…
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        • 21. /vendor/laravel/framework/src/Illuminate/Foundation/Http/Middleware/VerifyCsrfToken.php:78
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        • 20. /vendor/laravel/framework/src/Illuminate/Pipeline/Pipeline.php:167
        • 21. /vendor/laravel/jetstream/src/Http/Middleware/ShareInertiaData.php:61
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        • 22. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
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        • 27. /vendor/laravel/framework/src/Illuminate/Routing/Controller.php:54
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        Metadata
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        • 25. /vendor/livewire/livewire/src/ComponentConcerns/RendersLivewireComponents.php:69
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