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1、STD-JIS B b17-ENGL 1984 4733b08 05437b0 b5O = UDC 621.646.001.4:621.564 JIS JAPANESE I NDUSTRIAL STANDARD Methods of Testing for Performance of Thermostatic Refrigerant Expansion Valves JIS B 8619-1984 This copy is an English version of Japanese Industrial Standard prepared by Japanese Standards Ass
2、ociation, the copyright holder. Any further reproduction wit hout permission is prohibited. Translation without guarantee I I i n the event of any doubt arising, the I i standard i n Japanese is to be evidence ! I Trans la t ed Japanese Standards Association 1-24, Akasaka 4, Minato-ku Tokyo 107 Japa
3、n 0 JSA, 3-985 _. Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B bL7-ENGL L98Li W 4933b8 05437b
4、L 597 H UDC 621.646.001.4:621.564 JAPANESE INDUSTRIAL STANDARD J I S B 8619-1984 Methods of Testing for Performance of Thermostatic Refrigerant Expansion Valves 1. scope This Japanese Industrial Standard specifies methods of testing for performance of thermostatic refrigerant expansion valves for us
5、e with the refrigerants R 12, R 22 and R 502 which will be used in refrigerating equipment and air-conditioning equipment, for use at evaporation temper- ature between 10C and -40C, and in sizes up to and including a nominal capacity of 34500 kcal/h (40000 W) at evaporation temperature of 5 O C , he
6、reinafter referred to as the “expansion valves“. This standard does not apply to permanent bleed type valves. refer to 2. (i) (c). Remarks 1 . The units and numerical values given in standard are in accordance with the International System of Units ( S I ) , and are appended for reference. 1 in this
7、 2. The pressure used in this standard is the gauge pressure. 2. Definitions For the purpose of this standard the following definitions shall apply: (1) thermostatic expansion valve A valve which regulates the flow of refrigerant into an evaporator of refrigerating equipment or air-conditioning equi
8、pment and which is actuated by changes in evaporation pressure and superheat of the refrigerant gas leaving the evaporator. types: Valves are classified into the following three Applicable Standards: JIS B 8620-Safety Code for Small Refrigerating Equipment JIS C 5030-Change of Temperature Testing Pr
9、ocedures for Electronic Components - 1 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B BbLS-EN
10、GL 1984 4933b08 05439b2 423 ( a ) internal equalizer type A type of expansion valve in which the pressure applied to the power element (diaphragm or belows) is equalized to the valve outlet pressure through the internal passage. (b) external equalizer type A type of expansion valve in which the evap
11、orator outlet pressure is transmitted to the power element by means of a connecting tube, 2nd which provides a means for compensating for pressure drop through evaporator. (c) permanent bleed type A type of expansion valve in which a fixed orifice is provided in parallel. permits the refrigerant to
12、flow through, or in parallel with, Such fixed orifice the main valve port, and the permanent bleed rate is expressed as a percentage of nominal capacity. (2) expansion valve pressure drop The pressure drop cause by flow of refrigerant through expansion valve, which is the net pressure difference bet
13、ween the valve inlet and outlet pressures. (3) expansion valve charge system Such system that a medium filled in the power element (temperature sensitive bulb, capillary tube, diaphragm and bellows) responds to changes in temperature of the refrigerant leaving the evaporator. of system as given belo
14、w. There are three kinds (a) liquid charge In this system, a partial medium filled in the power element remains in the temperature sensitive bulb (called as thermal bulb) as liquid under all operating conditions. (b) gas charge In this system, all of the filled medium vapourizes at a predetermined t
15、hermal bulb temperature, and any temperature increase above this point results in virtually no increase in element pressure. - 2 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 M
16、DTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 8bLS-ENGL 1984 4933b 05437b3 3bT W The pressure in the power element in such case is called as the maximum operating pressure. (abbreviated as MOP) (c) absorbent charge In this system, the medium actuates in conjuncti
17、on with an absorbent. (4) expansion valve superheat The temperature difference between the thermal bulb temperature and the saturation temperature corresponding to the refrigerant pressure at the expansion valve outlet for internal equalizer type, or at the evaporator outlet for external equalizer t
18、ype. in the sum of (a) and (b) given below. This temperature difference (a) static superheat The superheat when an expansion valve starts to open from totally closed state. (b) superheat change (or superheat gradient) The change in superheat which is required to open the expansion valve a pre-determ
19、ined amount from the start. (5) expansion valve rating conditions The operating conditions under which only a single level of performance results and which consist of the conditions given below. (a) standard rating conditions Rating conditions specified as the basis of comparison of performance char
20、acteristics, and mean the A, B, C and D shown in Table 1. (b) application ratine, conditions Rating conditions, other than standard rating conditions. They may be established by the manufacturer in his technical data, or engineering specification, or otherwise. - 3 - Copyright Japanese Standards Ass
21、ociation Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- (6) rating capacity of expansion valve The capacity based on the test carried out under ra
22、ting conditions. (a) standard rating capacity The capacity at the point of rating, based on the test carried out under the standard rating conditions given i n Table 1. (b) nominal capacity The capacity at the point of rating, based on the test carried out under the A of the standard rating conditio
23、ns given i n Table 1. (c) application rating capacity The capacity at the point of rating, based on the test carried out under conditions other than the standard rating conditions. (d) point of ratinq Any set of test conditions at which a capacity rating is to be established. (e) maximum capacity Th
24、e maximum capacity exceeding any capacity rating which an expansion valve can allow. 3. Test Items The test items shall be as follows: (1) t i m e constant test (2) opening and hysteresis test of expansion valve (3) flow test (4) static superheat characteristic test (5) endurance test ( 6 ) temperat
25、ure cycle test (7) airtightness test - 4 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- STD*JIS B 8bL9-
26、ENGL 1984 E i1933bO8 O5Li37b5 132 Standard rating conditions A B C D 4. Test Conditions for Rating Capacity Test Pressure drop across inlet and outlet of expansion valve kgf /cm2 hPp9) Liquid refri- Evaporation gerant tempr- temperature. ature O C “C R12 R22, R502 38 5 4I0.4) 70.7) 38 -10 60.6) 90.9
27、) 38 -20 70.7 101.0) 38 -40 80.8) 121.2) 4.1 The liquid refrigerant entering the expansion valve shall be vapour free, and shall be sub-cooled between 3C and 6C below the saturation temperature. 4.2 The oil concentration in the refrigerant used for shall not exceed 2 percent by weight. 4.3 The stand
28、ard rating conditions shall be as given Table 1. Standard Rating Conditions testing n Table Remark: The evaporation temperature means a saturation temperature corresponding to evaporator pressure at outlet. 5 . Calculation of Capacity The capacity of expansion valve shall be calculated from the foll
29、owing formula: - 5 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- where, 0 : qmr : h 2 : hi : K : capac
30、ity of expansion v.alve (kcal/h) W) refrigerant mass flow rate at the point of rating .(kg/h) kg/s) specific enthalpy of the saturated refrigerant gas leaving the evaporator (kcal/kg) J/kg specific enthalpy of the saturated refrigerant liquid entering the expansion valve (kcal/kg)J/kg a correction f
31、actor for conditions of sub-cooling, superheating, and units of measurement 6. Testing Instrumlants The types and accuracies of testing instruments shall be as given below (Table 2). Table 2. Type and Accuracy of Instrument Classif i- . cation Temper- ature Pressure Expansion valve opening Flow rate
32、 Time cons tant Type Glass stem thermometer Thermocouple.thermometez Electric resistance thermometer Mercury manometer Pressure transducer Other thermometer Dial gauge Electrical transducer Flowmeter Graduated cylinder Automatic recorder Accuracy iO.l“C, minimum scale spacing shall not exceed 0 . 2
33、C t l X (reading of absolut e pres sure) 9inimum scale: 3.01 rmn max. tlX (measured talue) k2X (lapse of time) kcuracy on pressure i s as specified in :lassif ication (pressure). - 6 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, U
34、ser=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- - STD-JIS B bL4-ENGL 1984 = 4433b08 05434b7 TO5 M JAPANESE STANDARD ASOCIAT;fOJ 7. Test Procedure 7.1 Test Procedure for Time Constant 7.1.1 Test Equipment The test equipmen
35、t shall be as given in Fig, 1. Fig. 1 . Test Equipment for Time Constant Air. The pressure transducer for measuring expansion valve outlet pressure $2. is so connected that the signal can be inputted to the pen recorder. Connection is made so that the temperatures of thernostatic baths can be inputt
36、ed to the pen recorder. The thermostatic baths shall maintain different temperatures as prescribed below. ( a ) Temperature of thermostatic bath for measuring time constant at thermal bulb temperature decrease ti (b) Temperature of thermostatic bath for measuring time constant at thermal bulb temper
37、ature increase fz (c) The temperature difference between the thermostatic bath temperature fi and that of tz shall be 10C or more, and t i (2) The time constant at thermal bulb temperature decrease TaCs) - 8 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IH
38、S Employees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B Bb39-ENGL 1984 4933b08 05439b7 8198 3 Fig. 2. Time Constant I Pressure kgf/cm2 W a f 7.2 Test Procedure for Opening and Hysteresis of Expa
39、nsion Valve The test procedure for opening and hysteresis of expansion valve shall be as follows: 7.2.1 Test Equipment The test equipment shall be as given in Fig. 3. Fig. 3. Test Equipment for Expansion Valve Opening Measuring instru- ment for expansion valve.opening Pressure -Air or gas. vaive The
40、rmos tt ic bath 7.2.2 Testing Method Mount the expansion valve whose superheat has been preset on the test equipment of Fig. 3., and carry out the test in accordance with either of the methods prescribed below. (1) Method for Testing Expansion Valve Opening vs Internal or External Equalizer Pressure
41、 ( a ) Immerse the thermal bulb into a thermostatic bath maintained at a specified temperature. (b) Pressurize on expansion valve of internal equalizer type from its outlet port. - 9 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Employees/1111111001, U
42、ser=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- Pressurize an expansion valve of external equalizer type from the external equalizer tube connection. Take adequate means not to allow leakage of air or gas from the expansi
43、on valve inlet and measuring instrument for expansion valve opening, i n the above cases. Increase the applied pressure i n increments of not more than 0.1 kgf/cm20.01 MPa i n the state of (b) or (c), and measure respective expansion valve openings. Next decrease the applied pressure i n incresients
44、 of not more than 0.1 kgf/cm20.01 MPa, and measure respective expansion valve openings. (2) Method for Testing Expansion Valve Opening vs Thermal Bulb Temperature Pressurize an expansion valve of internal equalizer type from its outlet port. Pressurize an expansion valve of external equalizer type f
45、rom the external equalizer tube connection. Take adequate means not to allow leakage of a i r or gas from the expansion valve inlet and measuring instrument for expansion valve opening, i n the above cases. Increase the thermal bulb temperature i n increments of not more than l0C in the state of (a)
46、 or (b), and measure the respective expansion valve openings. Next, decrease the thermal bulb temperature i n increments of not more than 1“C, and measure the respective expansion valve openings. - 10 - Copyright Japanese Standards Association Provided by IHS under license with JSALicensee=IHS Emplo
47、yees/1111111001, User=Wing, Bernie Not for Resale, 03/15/2007 21:13:47 MDTNo reproduction or networking permitted without license from IHS -,-,- STD-JIS B 8bL9-ENGL 1784 4733b08 0543971 43b m 7.2.3 Expression of Opening and Hysteresis of Expansion Valve The opening and hysteresis of expansion valve
48、shall be expressed as follows: (1) When Equalizer Pressure is Changed (a) As shown i n Fig. 4 , plot curves of expansion valve opening vc internal or external equalizer pressure, utilizing the amounts of expansion valve opening measured at equalizer pressure increase and at equalizer pressure decrease. Fig. 4 . Expansion Valve Opening vs Internal or External Equalizer Pressure Expansion valve opening