expansion valv

8/2/2019 Expansion Valv

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Brass Thermostatic Expansion Valve

Product DetailsCompany ProfileQuick Details

Type: Air Conditioner Parts Application: Home Type: Air Conditioning Fitting

Place of Origin: ZhejiangChina (Mainland)

Brand Name: DunAn Model Number: TV

Adjustable overheat: Innerpressure balance str...

Packaging & Delivery

PackagingDetail:

paper carton, wooden box

Delivery Detail: within 25 days

Specifications

Thermostatic expansion valve is Bi-directional flowing design which can meet both heating andcooling requirement.

Application

1.Lower the temperature and pressure of refrigerant in order to conduct heat exchange inevaporator

2.Adjust liquid flow rate of evaporator to meet heat load requirement of cooling system.

3.Control refrigerant overheating on evaporator exit. Ensure the evaporator heating efficiency

and avoid liquid slugging.

Characteristic:

1)Application Refrigerant:R22,R134a,R407C,R410A

2) Bi-directional flowing design which can meet both heating and cooling requirement.

3)Stainless steel power unit design, enlarges the life span of the valve.

4)Protecting compressor motor from damaging by high steaming pressure with maximum

operating pressure control.

5) Inner pressure balance structure.

6)Adjustable overheat.

7)46bar/667psi


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Maximum operating pressure is 46bar/667psi.

8)Temperature sensor charging method is optional.

In and out tube and capillary specification

Model In and outlet tube Outer balance tube Capillary tube length

TBEL 8 2.5 0.5m 1.6ft

Nominal Capacity

ModelR22 R134a R407C R410A

kW TR kW TR kW TR kW TR

TBEL

1.8 0.5 0.9 0.25 1.8 0.5 1.8 0.53.5 1 1.8 0.5 3.5 1 3.5 15.3 1.5 3.5 1 4.4 1.23 5.3 1.5

7.0 2 / / 7.0 2 7.0 28.8 2.5 5.3 1.5 8.8 2.5 11.0 3

Established in 2008, Zhejiang DunAn International Trading Co., Ltd is a subsidiary of ZhejiangDunAn Artificial Environment Equipment Co., Ltd., with total capital of RMB20 million and 70staff members.

We take charge of all export businesses of Zhejiang DunAn Artificial Environment EquipmentCo., Ltd. We have set up business offices in Japan, Thailand, Korea ,Malaysia and India,undertaking the business of air conditioning fittings, refrigeration plants, refrigeration controlcomponents, ...View more >>

Basic Information

Product/Service(We Sell):

air conditioning fitting and refrigeration plant:,service valve,magnesium,ballvalve,electromagnetic 4-way reversing valve,large capacity piston type 4-way reversing valve,accumulator,electronic expansion valve,PDF solenoidvalve,heat exchanger,check valve,weight balance,refrigeration controlcomponent,metal material,hardware fitting,electronic products,autopart,machine test equipment,instrumentation,electrical appliance,etc

Number ofEmployees:

51 - 100 People

Main Customers: LG,Samsung,Daikin, Carrier, Mitsubishi, Maersk, York, Goodman ect

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Thermostatic Expansion ValveMin.Order: 200 Piece/Pieces

Brass TVEN Thermostatic Expansion ValveMin.Order: 200 Piece/Pieces

Brass TCBE Thermal Expansion ValveMin.Order: 200 Piece/Pieces

Ball ValveMin.Order: 1000 Piece/Pieces

Ball Valve

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Figure 1. A conventional thermostatic expansion valve (TXV or TEV) is controlled by springs, bellows, and

push rods. (Graphics courtesy of Sporlan Valve Co.)

The function of the thermostatic expansion valve (TXV or TEV) is to hold a constant evaporator

superheat. When set and operating properly, the TXV will keep the evaporator active throughout its

entire length.

The conventional TXV is controlled by springs, bellows, and push rods. (See Figure 1.) Thespring force is a closing force on the TXV. The evaporator pressure, which acts under thethermostatic element's diaphragm, is also a closing force. An opening force is the remote bulbforce, which acts on top of the thermostatic element's diaphragm.


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There is also a liquid force from the liquid line, which acts on the face of the needle valve andhas a tendency to open the valve. However, this force is cancelled out when using a balancedport TXV. Working together, these forces maintain a constant evaporator superheat in arefrigeration system. There are no electronic devices associated with a conventional TXV.

The SEH-100 EEV from Sporlan Valve Co.

EEVs

The electronic expansion valve (EEV) operates with a much more sophisticated design. EEVs 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. The motor is

called a step or 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. A cutaway of an EEV with step motor and drive assembly is shown in Figure 2.

Step motors can run at 200 steps per second and can return to their exact position very quickly.The controller remembers the number of step signals sent by the controller. This makes itpossible for the controller to return the valve to any previous position at any time. This gives thevalve very accurate control of refrigerant that flows through it. Most of these EEVs have 1,596steps of control and each step is 0.0000783 inches.


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Figure 2. A cutaway of an electronic expansion valve (EEV) with step motor and drive assembly.

Sensors

The electronic signals sent by the controller to the EEV are usually done by a thermistor connected to

discharge airflow in the refrigerated case. A thermistor is nothing but a resistor that changes its

resistance as its temperature changes. Other sensors are often located at the evaporator inlet and

outlet to sense evaporator superheat. This protects the compressor from any liquid floodback under low

superheat conditions.

Pressure transducers can also be wired to the controller for pressure/temperature and superheatcontrol. Pressure transducers generally have three wires. Two wires supply power and the third isan output signal. Generally, as system pressure increases, the voltage sent out by the signal wirewill increase. The controller uses this voltage to calculate the temperature of the refrigerant withthe use of a pressure/temperature table programmed into the controller.


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A combination of compressor floodback protection and the ability to maintain refrigerator casedischarge air temperature set point control makes the EEV useful in many diverse applications.Some EEV controllers can also be programmed for custom control applications.

Figure 3. The feedback loop.

Feedback Loop

The controller may open the EEV too much and cause an overcooling condition. The sensors connected

to the refrigeration system and wired to the controller will sense this overcooling condition and feed this

information to the electronic controller and the EEV. This will cause the step motor to move in the

closing direction and close the valve more. The feedback loop is shown in Figure 3.

Next month: Advanced aspects of EEVs will be covered in the Sept. 6 issue ofThe News. tomc

To model mathematiclly the EEV as aprt of a refrigeration system, we need the mathematical eqaution

and the values of the constants. How can we get these information

To model mathematiclly the EEV as aprt of a refrigeration system, we need the mathematical eqaution

and the values of the constants. How can we get these information

HVACR INDUSTRY STORE

Electronically controlled electric valves have been accepted for years in larger applications, just as

chillers have been, and have proven to add efficiency to the systems. The key to the increase in

efficiency is due to their ability to control superheat to a low, stable setting. Since many chillers use
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almost infinitely variable screw compressors, an expansion valve that has the ability to follow these

radical changes in capacity is required. Traditionally, mechanical thermostatic expansion valves (TXVs)

are normally rated from about 50 to 110 percent of nominal rating. This rating is based on relatively

constant head pressure and liquid quality conditions. These valves may not allow efficient control of the

chiller during low load or head pressure conditions.

The electric expansion valve (EXV) has the ability to follow load, in most cases, from about 5 to115 percent of nominal load.

In addition, flash gas in the liquid line is less damaging to the operation of the system becausethe relatively large port and large stroke of the EXV allows them to open wide, purge the flashgas, and then re-establish the desired superheat. The advantages of the EXV are clear, but sincethe valve is an electric component, it requires some form of electric or electronic control.

Figure 1.

Click on the schematic for an enlarged view.

ELECTRONICS

Controllers for EXVs are becoming common and generally work in similar ways. Although electric, the

EXV is still an expansion valve. As such, it should be used to control superheat. Controllers allow the EXV

to do this by measuring the two components of superheat: pressure and temperature.

Standard calculations of superheat are all the same, whether done by a technician in the field oran electronic controller. The pressure in the suction line, just after the evaporator, is measured.This pressure is converted to a saturation temperature by the use of a pressure-temperature chartfor the refrigerant used. This saturated temperature is compared with the actual temperaturemeasured on the suction line, also near the outlet of the evaporator. The difference between thesetwo temperatures is the operating superheat.

Figure 2.

Click on the chart for an enlarged view.


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SENSORS

The electronic controller (shown in a common installation in Figure 1) fulfills this same function by using

electronic sensors.

The sensors involved are pressure transducers and temperature sensors. A pressure transducer is

a small, sealed device that is often mounted onto a tap on the suction line. Most are supplied witha valve depressor feature so that they may be threaded onto a Schrader tap. They may then beremoved for service without having to pump down and reclaim the system charge. The pressuretransducer is normally a three-wire device, two for power and one for signal.

The controller supplies the necessary power and reads the signal. This electrical signal isconverted back to pressure by the controller, which stores an equation to do so. The equation iseffective only for a specific brand and model of transducer, so replacements must be obtainedfrom the manufacturer of the controller. This equation is then combined with a reference table orpressure temperature table stored in the controller for the system refrigerant. (Sporlan controllersare often equipped with three to five refrigerant tables so that they may be selected in the field.

This feature allows one controller to be used in a number of applications and to be reconfiguredif the system refrigerant is changed.)

The temperature transducer, usually called a temperature sensor, is typically a device that variesresistance with temperature. There are a variety of types, NTC are negative temperaturecoefficient types and the resistance decreases with a rise in sensed temperature.

Another common type is the positive temperature coefficient type (PTC). In the PTC theresistance rises with temperature increases. The actual temperature to resistance characteristic isalso unique to a manufacturer and model and sensors are not interchangeable; replacements mustalso be obtained from the controller supplier. The resistance of the temperature sensor is

converted to a temperature inside the controller and this is compared to the temperaturecalculated from the pressure reading and refrigerant table (Figure 2).

Although complex to describe, the preceding calculations are straightforward and relatively easyto program into the controller. The difficult part of programming has to do with using thissuperheat information to modulate the valve position. (Although a number of EXV technologieshave been used, step motors are being recognized as the most precise and reliable means of valveoperation. The balance of this article is based on that type.)

The instructions the controller uses to arrive at valve position and modulation are called the"algorithm" and are generally proprietary information to the controller manufacturer. However,

each algorithm looks at operating superheat and compares it to the superheat set point chosen bythe user. If the superheat is higher than desired, the controller steps the valve open by the numberof steps calculated by the algorithm. If the superheat is low or flood back occurs, the valve israpidly driven shut by the algorithm.

Since the pressure and temperature sensors can react almost immediately to changes, thecontroller can follow, and in some cases predict changes in superheat quickly and react. Thisspeed and accuracy allows the EXV-controller-sensor system to precisely, quickly, and reliably


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control superheat to the most efficient setting under a wide set of loads and system conditions.The EXVs have no diaphragms and therefore no "gradient" or unpredictable variation inoperation.

Historically, when EXVs were applied, they were on stand-alone systems, they did not

communicate with other parts of the system or attempt to control other functions. They haveperformed the duty well and, as time went on, more economically. The power ofmicroprocessors or computer "chips" double every 18 months and most of our industry has beenslow to take advantage of these possibilities. While standalone EXV systems now approach theinstalled cost of a mechanically-based TXV system, to only consider this type of control isshortsighted and wasteful.

Figure 3.

POTENTIAL BENEFITS

Most current applications at worst ignore and at best under-utilize the potential benefits that electronic

control can bring. Our industry is one of temperature control and most aspects of design and service are

based on, or strongly require, measurements of pressure and temperature.

By its very nature, the EXV must have sensors that gather and interpret these measurements.Since that data exists and is captured by the controller, doesn't it make sense to use thatinformation as much as possible? This not only simplifies the system but also spreads the cost ofthe electronics and sensors over a wider range of features and system needs. For instance,

condenser fans may be cycled to maintain head pressure and liquid subcooling.

The need for subcooling affects system and expansion valve efficiency. What if the electroniccontroller (Figure 3) controls the condenser fans to ensure that the expansion valve is fed withthe solid liquid it needs, while at the same time, allowing head pressure to float to the lowestpossible level. Some controllers may be supplied with "stock" programs that offer a set group offeatures.

Other controllers may be supplied with customer-specific programming tailored to the preciseneed of the customer. The technology of electronics allows for economical program updates andthe addition of features even after system installation. The gains in system efficiency due to

floating head pressure are well documented. The incremental cost of adding this feature to anEXV controller is low. Efficiency of refrigeration applications, particularly low-temperatureinstallations, benefit from both lower head pressures and higher suction pressures. Since EXVsmay be oversized without sacrificing control at low loads, extremely rapid pull downs afterdefrost or at startup may be realized by using large EXVs to saturate the evaporator when theload is highest.


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A further benefit of the electronic controllers is the possibility to incorporate system diagnosticsand remote communication. The controllers are equipped with a number of sensors, andalgorithms that are under development that will use this information to signal, or even predict,system problems. Users may then be alerted to potential failures.

In the near future we will likely see controllers that are Web-enabled. These devices can bemonitored by the homeowner, contractor or electric utility to ensure efficiency and accuracy.

For more information, go to www.sporlan.com.

Publication date: 11/06/2006

Brian Dolin is Senior project manager, Electro-Mechanical Products, Sporlan Division, Parker Hannifin

Corp.

Recent Articles by Brian Dolin

Basic Thermodynamics for Refrigeration and Air Conditioning

chiller expatiation valve

expansion valve can be prepare, how do know it flats, tel me how can check to mail janakawmjb

@yahoo.com

Image Galleries

Electronic Expansion Valve

Emerson Climate Technologies' electrical control valves are fully hermetic stepper motor

driven valves optimized for control of liquid or gaseous mass flow. The universal drivers

enable controlled operation of motor driven valves such as electronic expansion valves and

evaporator pressure regulators while the stand-alone superheat controllers maintain stable

superheat control for air conditioning, refrigeration, and industrial applications.

Superior Design

The EX 100% stainless steel, hermetic construction makes these valves suitable forvirtually any application without concern for rusting or corrosion;

Uses a unique, patent ceramic gate to control refrigerant flow, allowing the EX valveto maintain the same control resolution across the entire range of valve travel while
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minimizing hunting and allowing for tighter superheat control for energy efficiency;

No gear mechanism for high reliability.Application and Capability

Can also be used to control refrigerant anywhere the system; Can function as expansion valves, hot gas bypass, head pressure, suction gas

throttling, liquid line actuator and other applications;

Five different sizes of valves cover a capacity range of 5 to 290 of total liquidrefrigerants;

Maintains a desired superheat regardless of conditions for a more efficient operatingsystem.

Thermal Expansion Valves

Emerson's TXVs are designed for a wide range of air conditioning, refrigeration, heat pump,

and chiller applications.

Emerson uses stainless steel power elements that are unsusceptible to corrosion. We offer

products with conventional, as well as balanced ported designs that are advantageous when

applied to systems with large load variations and/or floating head applications. Emerson also

manufactures bi-flow designs for use in heat pumps and many of our TXVs have a take-apart

design for ease of service. Emerson thermal expansion valves cover a wide range of nominal

capacity, from ton to 100 ton.

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Product DetailsCompany Profile

Quick Details

Place of Origin: Zhejiang China(Mainland)

Brand Name: ZHONGBAO Model Number: DPF

Application: Refrigeration Parts

Specifications
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High quality electronic expansion valve.Precision refrigerant flow controlPrompt reactivity

Detailed Product Description

Application:

Applied to inverter air-condition or some other refrigeration equipment to realize the automaticcontrolling of refrigerant flow rate , thus to make air conditioning system to work in the bestsituation and realize fast freezing , temperature precision controlling and power saving.

Refrigerant: R22, R134a, R404A, R407C, R410AFeatures:

High cool down capability.

Quick response.Less energy consumption.Bi-Flow capability.

Product

No.

Port

size

(mm)

R22 Capacity

(U.S.R.T) (kW)

Maximum Operating

Pressure Difference

(Mpa)

Maximum Working

Pressure (Mpa) Connection

(Solder) (mm)

R22 R407C R410A R22 R407C R410A

DPF1.6 1.6 1(3.6)

2.26 2.483.43

3.00 3.304.2

6.35

DPF1.8 1.8 1.5(5.0)

8.00

DPF2.2 2.2 2(7.1)

DPF2.4 2.4 3.6(12.5)

DPF3.0 3.0