Just Better 720-97 ARI User Manual

ARI Standard 720-97

Refrigerant Access Valves and Hose Connectors

Section 1. Purpose

Purpose.

1.1 . The purpose of this standard is to establish, for refrigerant access valves and hose connectors used in refrigerating and air-conditioning systems; definitions, location requirements, dimensions and materials, gaging procedures and conformance requirements.

1.1.1 guidance of the industry, including manufacturers, engineers, installers, contractors and users.

1.2

Review and Amendment

to review and amendment as technology advances.

2.1

Scope

refrigerant access valves and hose connectors as defined in Section 3.

2.1.2 valves and hose connectors intended for use with halogenated hydrocarbon refrigerants.

3.1

Definitions.

the standard industry definitions in the current edition of

ASHRAE Terminology of Heating, Ventilation, Air

Conditioning and Refrigeration

defined in this section.

3.2

Refrigerant Access Valve

valve is a normally closed valve containing a refrigerant valve core incorporating a SAE external flare connection means and used for the purpose of servicing refrigeration or air conditioning systems.

3.3

Refrigerant Access Valve Body

access valve body is a special fitting machined such that is provides the external details of a SAE flare connector and internal details to permit the insertion of a refrigerant valve core.

3.4

Refrigerant Access Valve Hose Connector

refrigerant access valve hose connector is a modified SAE internal threaded flare connector suitable for sealed attachment to a refrigerant hose and containing a flare sealing gasket and a depressor to automatically depress the valve core pin as the connector is threaded on the access valve external flare connection.

This standard is intended for the

Intent.

. This standard is subject

Section 2. Scope

. This standard applies to 1/4 in. SAE flare

Refrigerant

Section 3. Definitions

. This standard applies to access

. All terms in this document will follow

unless otherwise

. A refrigerant access

. A refrigerant

. A

3.5 Refrigerant Valve Core.

an assembly containing a spring and moveable core pin and seating details, suitably threaded for insertion into a refrigerant access valve body to provide a normally closed valve arrangement intended for use with a refrigeration or air conditioning system. Depression of the core pin opens the valve.

3.6

"Shall", "Should", "Recommended", or "It Is Recommended". "Shall", "should", "recommended", or "it is recommended"

3.6.1

Shall

a provision specified, that provision is mandatory if compliance with the standard is claimed.

3.6.2

Should, Recommended, or It is

Recommended

recommended" is used to indicate provisions which are not mandatory but which are desirable as good practice.

Section 4. Location Requirements

Figure 1 REQUIRED PIN LCATION

With A Recommended Initial Assembly Torque of 1-1/2 To 3 In. Lbs.

4.1

Location of Valve Core Pin in Access Valve Body

The internal machining of the access valve body shall be such that the insertion of the valve core into the valve body with a recommended initial assembly torque between 1-1/2 to 3 inch pounds [1.7 to 3.4 cm kg or 0.17 to 0.34N • m], shall provide a refrigerant seal and position the top of the core pin at a location between 0.010 in. [0.25 mm] above to 0.035 in. [0.89 mm] below the end face of the valve body flare, see Figure 1 above.

4.2

Location of Hose Connector Gasket and Core Pin

Depressor

specified by this standard, the core pin depressor in the hose connector shall be positioned to permit threaded engagement with the access body flare threads and connector gasket contact with the body flare face before the depressor engages the core pin.

It is recommended that for full flow the hose connector and pin depressor should be capable of depressing the core pin a minimum of 0.020 in. [0.51 mm].

. With the core pin located within the limits

shall be interpreted as follows:

. Where "shall" or "shall not" is used for

. "Should", "recommended", or "it is

A refrigerant valve core is

.010 MAX.

.035 MAX.

ARI Standard 720-97

Refrigerant Access Valves and Hose Connectors

Section 5. Dimensions and Materials

REFRIGERANT ACCESS VALVE DIMENSIONS 1/4" SAE FLARE SIZE Dimensions In Inches

.210-36UNS-1MOD.P.D. TH'D.

REF.

.551

Counterbore and/or Chamfer Optional.

This Diameter Must Be Concentric With Pitch Diameter Of Internal Th'd. Within .003 T.I.R.

1/4" SAE Flare External Dimensions To Conform To ANSI/SAE J513f "Refrigeration Tube Fittings"

.076 .064

CORE SEAL

VALVE SEAL

Figure 2

DIA.

Figure 3

TYPICAL BODY DIMENSIONS

.206-36 UNS-1 MOD. TH'D.

Sealing Materials to Be Compatible with Halogenated Hydrocarbon Refrigerants and Refrigerant Oil For The Intended Application.

TYPICAL CORE DIMENSIONS

5.1

Dimensions

.192 .197

DIA.

.189 .181

MIN.FULL

TH'D DEPTH

.293

EXACT DATUM DIA. .1693

17°±30' INCL. ANGLE

MIN. DIA.

.168

DIA.

.155

.150

REF.

.109

REF.

.025

.875

.4091 .3941

MAX.

CONVERSION TABLES

INCHES MILIMETERS

.875 22.2 .551 14.0 .4091 10.39 .3941 10.01 .308 7.82 .293 7.44 .189 4.80 .181 4.60 .1719 4.366 .1693 4.300 .168 4.27 .155 3.94 .150 3.81 .109 2.77 .076 1.93 .064 1.63 .035 0.89 .025 0.64 .010 0.25 .003 0.08

DEGREES RADIANS

17°30' 0.3054 16°30' 0.2880

IN.LBS. CM.KG.

1-1/2 1.7 3 3.5

. See Figures 2 and 3 (above).

5.1.1 While conformance to Figures 2 and 3 is recommended, where components do not meet the constructional and dimensional requirements shown, all access valves shall still interchange with components that meet these requirements and shall comply with all mandatory requirements to be in conformance with this standard.

5.2

Materials.

Materials used for the seals on the valve core shall be compatible for service with halogenated hydrocarbon refrigerants and refrigerant oil for the intended application.

Section 6. Gaging Procedures

6.1

ACCESS VALVE BODY GAGING PROCEDURES

Figure 4

PLUG GAGE

Gaging.

Dimensions In Inches

.4091 .3941

EXACT DATUM DIA. .1693

Figure 5

BALL GAGE

.308 .293

.1719 DIA. BALL

Figures 4 and 5 (above) show two

accepted methods of gaging the access valve body.

Section 7. Voluntary Conformance

7.1

Conformance.

While conformance with this standard is voluntary, conformance shall not be claimed or implied for products or equipment within its

Purpose

(Section 1) or

(Section 2) unless such

Scope

claims meet all of the requirements of the standard.

APPENDIX A. References-Normative

A1 Listed here are all standards, handbooks, and other

publications essential to the formation and implementation of the standard. All references in this appendix are considered as part of the standard.

A1.1 ANSI/SAE Standard J513f-MAY94,

Refrigeration Tube Fittings

, 1994, American National Standards Institute/Society of Automotive Engineers, 11 West 42nd Street, New York, NY 10036, U.S.A./400 Commonwealth Drive, Warrendale, PA 15096, U.S.A.

A1.2

ASHRAE Terminology of Heating, Ventilation,

Air Conditioning and Refrigeration,

American Society of Heating, Refrigerating and AirConditioning Engineers, Inc., 1791 Tullie Circle N.E., Atlanta, GA 30329, U.S.A.

APPENDIX B. References-Informative

A1 None.

ANSI/ARI Standard 720-97 used by permission

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Phone: 703-524-8800 Web: www.ari.org

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