1、 4301 NORTH FAIRFAX DRIVE ARLINGTON, VIRGINIA 22203 2001 STANDARD for REFRIGERANT PRESSURE REGULATING VALVES Standard 770 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Pr
2、ice $15.00 (M) $30.00 (NM) Copyright 2001, by Air-Conditioning and Refrigeration Institute Printed in U.S.A. Registered United States Patent and Trademark Office IMPORTANT SAFETY RECOMMENDATIONS It is strongly recommended that the product be designed, constructed, assembled and installed in accordan
3、ce with nationally recognized safety requirements appropriate for products covered by this standard. ARI, as a manufacturers trade association, uses its best efforts to develop standards employing state-of-the-art and accepted industry practices. However, ARI does not certify or guarantee safety of
4、any products, components or systems designed, tested, rated, installed or operated in accordance with these standards or that any tests conducted under its standards will be non-hazardous or free from risk. Note: This standard supersedes ARI Standard 770-94. Copyright Air-Conditioning and Refrigerat
5、ion Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-TABLE OF CONTENTS SECTION PAGE Section 1. Purpose .1 Section 2. Scope 1 Section 3. Definitions 1 Section 4. Test Requirements2 Section 5. Rating Requirements 2 Secti
6、on 6. Minimum Data Requirements for Published Ratings.2 Section 7. Marking and Nameplate Data.3 Section 8. Conformance Conditions3 APPENDICES Appendix A. References - Normative4 Appendix B. References - Informative 4 Appendix C. Method of Testing for Rating Refrigerant Pressure Regulating Valves - N
7、ormative5 TABLES FOR APPENDICES Table C1. Pressure-Tap Hole Diameters and Lengths 8 Table C2. Specific Heat Ratios (k)14 FIGURES FOR APPENDICES Figure C1. Typical System Piping for Pressure Regulating Valve Liquid Flow Test .6 Figure C2. Typical System Piping for Pressure Regulating Valve Gas Flow T
8、est7 Figure C3. Mass Flow Rate vs. Density C Pressure Drop.11 Figure C4. KA vs. Acoustic Ratio.13 Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-Copyright Air-Conditioning
9、 and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 770-2001 1 REFRIGERANT PRESSURE REGULATING VALVES Section 1. Purpose 1.1 Purpose. The purpose of this standard is to establish, for Refri
10、gerant Pressure Regulating Valves: definitions; test requirements; rating requirements; minimum data requirements for Published Ratings; marking and nameplate data; and conformance conditions. 1.1.1 Intent. This standard is intended for the guidance of the industry, including manufacturers, engineer
11、s, installers, contractors and users. 1.1.2 Review and Amendment. This standard is subject to review and amendment as technology advances. Section 2. Scope 2.1 Scope. This standard applies to Refrigerant Pressure Regulating Valves controlling Volatile Refrigerant flow that primarily respond to press
12、ure. The types of Refrigerant Pressure Regulating Valves are those that are responsive to inlet, to outlet, or to differential pressures sensed locally or remotely. 2.2 Exclusions. Excluded from this standard are Automatic Expansion Valves and devices used with: a. Automotive and recreational vehicl
13、e air-conditioning b. Household refrigerating units c. Room air-conditioners Section 3. Definitions All terms in this document shall follow the standard industry definitions in the current edition of ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration unless otherwise defi
14、ned in this section. 3.1 Bubble Point. Refrigerant liquid saturation temperature at a specified pressure. 3.2 Dew Point. Refrigerant vapor saturation temperature at a specified pressure. 3.3 Gradient. The change in controlled pressure required to move the Refrigerant Pressure Regulating Valve closur
15、e member from its opening point to its standard rated capacity, psi kPa. In some types of pilot-operated controllers, the Gradient could be essentially zero. 3.4 Main. Tubing or piping by which the Refrigerant Pressure Regulating Valve is connected to the apparatus. 3.5 Pressure Drop. The pressure d
16、ifference between the Refrigerant Pressure Regulating Valve inlet and the Refrigerant Pressure Regulating Valve outlet, with the main port (orifice) open, psi kPa. 3.6 Published Rating. A statement of the assigned values of those performance characteristics under stated Rating Conditions, by which a
17、 Refrigerant Pressure Regulating Valve may be chosen to fit its application. These values apply to all Refrigerant Pressure Regulating Valves of like nominal size and type produced by the same manufacturer. As used herein, the term Published Rating includes the rating of all performance characterist
18、ics shown on the Refrigerant Pressure Regulating Valve or published specifications, advertising or other literature controlled by the manufacturer, at stated Rating Conditions. 3.6.1 Application Rating. A rating based on tests performed at Application Rating conditions (other than Standard Rating Co
19、nditions). 3.6.2 Standard Rating. A rating based on tests performed at Standard Rating Conditions. 3.7 Rating Conditions. Any set of operating conditions under which a single level of performance results, and which cause only that level of performance to occur. 3.7.1 Standard Rating Conditions. Rati
20、ng Conditions used as the basis of comparison for performance characteristics. 3.8 Refrigerant Pressure Regulating Valve. A self or pilot-operated controller in which the energy to position the Refrigerant Pressure Regulating Valve closure member is provided by the pressure of the controlled refrige
21、rant, sensed locally or remotely. 3.8.1 Differential Pressure Regulating Valve. A valve which opens or closes in response to a difference in pressure between the inlet and outlet, sensed locally or remotely. 3.8.2 Downstream Pressure Regulating Valve. A valve which opens or closes in response to a c
22、hange in outlet pressure, sensed locally or remotely. 3.8.3 Upstream Pressure Regulating Valve. A valve which opens or closes in response to a change in inlet pressure, sensed locally or remotely. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for Re
23、saleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 770-2001 2 3.8.4 Valve Closure Member. The part of a valve which is positioned to close, open or modulate the flow through the valve port(s). 3.9 Refrigerant Pressure Regulating Valve Capacity. The mass flow rate o
24、f a fluid through the Refrigerant Pressure Regulating Valve, expressed in suitable units for the application and based on specific conditions. 3.10 Set Point. A predetermined pressure which the Refrigerant Pressure Regulating Valve is set to maintain, psi kPa. 3.11 “Shall“ or “Should.“ “Shall“ or “s
25、hould“ shall be interpreted as follows: 3.11.1 Shall. Where shall or shall not is used for a provision specified, that provision is mandatory if compliance with the standard is claimed. 3.11.2 Should. Should is used to indicate provisions which are not mandatory but which are desirable as good pract
26、ice. 3.12 Volatile Refrigerant. A fluid used for heat transfer in a refrigerating system which absorbs heat at a low temperature and low pressure of the fluid and transfer heat at a higher temperature and a higher pressure of the fluid, usually involving changes of state of the fluid. Section 4. Tes
27、t Requirements 4.1 Capacity Tests. All Refrigerant Pressure Regulating valve Capacity tests shall be in accordance with the test procedure outlined in Appendix C. Section 5. Rating Requirements 5.1 Rating Requirements. Published Capacity Ratings shall consist of Standard Ratings and may include Appl
28、ication Ratings. The ARI Standard Ratings of Refrigerant Pressure Regulating Valve Capacity shall be stated in tons of refrigeration kW and at the conditions specified in 5.2. 5.2 Standard Rating Conditions. 5.2.1 Refrigerant Pressure Regulating Valve Entrance Conditions. a. Liquid Service Temperatu
29、re: 101F 38.3oC saturated liquid refrigerant b. Suction Service Temperature: 65F 18oC superheated refrigerant vapor at the saturation pressure corresponding to 40oF 4.4oC c. Discharge Gas Service Temperature: Superheated refrigerant vapor at a temperature based on 5.2.4 5.2.2 Expansion Point Enthalp
30、y (hf). Enthalpy based on 100oF 37.8oC saturated liquid (Bubble Point) refrigerant entering the expansion valve. 5.2.3 Enthalpy of the Refrigerant Suction Gas (hg). Enthalpy based on vapor at Dew Point pressure corresponding to 40oF 4.4oC leaving the evaporator. 5.2.4 Discharge Gas Temperature. The
31、temperature that would result from isentropic compression from the saturated evaporator (Dew Point) temperature with 25.0oF 13.9oC superheat, to a saturated condensing (Bubble Point) temperature of 100oF 37.8oC with 50.0oF 27.8oC added as an approximation of the actual polytropic refrigerant compres
32、sion process. 5.2.5 Gradient. Every Published Capacity Rating shall be based on the capacity resulting from a pressure change above or below the Set Point where applicable. The maximum pressure change upon which the rating is based shall be clearly designated. 5.3 Application Rating. Application Rat
33、ings give performance data under operating conditions other than those given above. Applications Ratings shall contain all information shown in 6.2. Published Ratings shall be subject to the tolerances of this standard. 5.4 Tolerances. To comply with this standard, measured test results shall not be
34、 less then 95% of Published Capacity Rating. Section 6. Minimum Data Requirements for Published Ratings 6.1 Minimum Data Requirements for Published Ratings. As a minimum, Published Ratings shall include all Standard Ratings. All claims to ratings within the scope of this standard shall include the s
35、tatement Rated in accordance with ARI Standard 770. All claims to ratings outside the scope of this standard shall include the statement Outside the scope of ARI Standard 770. Wherever Applications Ratings are published or printed, they shall include a statement of the conditions at which the rating
36、s apply. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 770-2001 3 6.2 Published Ratings. Published Ratings shall include the following information: a. Set Po
37、int adjustment range, psi kPa b. Refrigerant designation(s) per ANSI/ASHRAE 34 with Addenda c. Fluid state (liquid or gas) d. Capacity at Standard Rating Conditions, tons kW e. Pressure Drop across valve (at Standard Rating Conditions), psi kPa f. Gradient at Rated Conditions g. Model designation, l
38、ine connections (size and type) h. Manufacturers name and address Section 7. Marking and Nameplate Data 7.1 Marking and Nameplate Data. As a minimum, each Refrigerant Pressure Regulating Valve shall be marked with the following information: a. The manufacturers name or trade name b. Model designatio
39、n c. Refrigerant designation(s) per ANSI/ASHRAE Standard 34 with Addenda Section 8. Conformance Conditions 8.1 Conformance. While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within its Purpose (Section 1) and Scope (Section 2) un
40、less such claims meet all of the requirements of the standard. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reproduction or networking permitted without license from IHS-,-,-ARI STANDARD 770-2001 4 APPENDIX A. REFERENCES - NORMATIVE A1
41、 Listed here are all standards, handbooks and other publications essential to the formation and implementation of the standards. All references in this appendix are considered as part of the standard. A1.1 ANSI/ASHRAE Standard 34-2001 with Addenda, Designation and Safety Classification of Refrigeran
42、ts, 2001, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. A1.2 ANSI/ASHRAE Standard 41.1-86 Standard Method for Temperature Measurement, 1986, American Society of Heating, Refrigerating, and Air-Conditioning Enginee
43、rs, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. A1.3 ANSI/ASHRAE Standard 41.3-89 Standard Method for Pressure Measurement, 1989, American Society of Heating, Refrigerating, and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. A1.4 2001 ASHRAE Handboo
44、k - Fundamentals, American Society of Heating Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. A1.6 ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration, Second Edition, 1991, American Society of Heating, Refrigerating a
45、nd Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. APPENDIX B. REFERENCES - INFORMATIVE B1 Listed here are standards, handbooks and other publications which may provide useful information and background but are not considered essential. References in this appendi
46、x are not considered part of the standard. B1.1 ASHRAE Handbook - HVAC Systems and Equipment, 2000, American Society of Heating Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. B1.2 ASHRAE Refrigerant Line Sizing RP185, 1977, American Society of
47、Heating, Refrigerating and Air-Conditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A. B1.3 ASME Fluid Meters. Their Theory and Application, Sixth Edition, 1971, American Society of Mechanical Engineers, 345 East 47th Street, New York, NY 10017, U.S.A. B1.4 Flow Characterist
48、ics of Solenoid Valves - Report No. 3 Final Report, dated January 1970, a thesis submitted by George T. Kartsounes to the Faculty of Purdue University, West Lafayette, IN 47907-1077. Copyright Air-Conditioning and Refrigeration Institute Provided by IHS under license with ARINot for ResaleNo reprodu
49、ction or networking permitted without license from IHS-,-,-ARI STANDARD 770-2001 5 APPENDIX C. METHOD OF TESTING FOR RATING REFRIGERANT PRESSURE REGULATING VALVES - NORMATIVE C1 Method of Test. C1.1 Flow Capacity. C1.1.1 The Refrigerant Pressure Regulating Valves shall be tested in a fluid flow loop with instrumentation per C2 and apparatus per C3. C1.1.2 The Refrigera
