Just Better 720-97 ARI Standard Refrigerant Access Valves and Hose Connectors - Manual

1
Refrigerant Access Valves and Hose Connectors
Section 1. 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.
1.1.1Intent. This standard is intended for the
guidance of the industry, including manufacturers,
engineers, installers, contractors and users.
1.2Review and Amendment . This standard is subject
to review and amendment as technology advances.
Section 2. Scope
2.1Scope . This standard applies to 1/4 in. SAE flare
refrigerant access valves and hose connectors as
defined in Section 3.
2.1.2Refrigerant . This standard applies to access
valves and hose connectors intended for use with
halogenated hydrocarbon refrigerants.
Section 3. Definitions
3.1Definitions. . All terms in this document will follow
the standard industry definitions in the current edition
of ASHRAE Terminology of Heating, Ventilation, Air
Conditioning and Refrigeration unless otherwise
defined in this section.
3.2Refrigerant Access Valve . A refrigerant access
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.
3.3Refrigerant Access Valve Body . A refrigerant
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.
3.4Refrigerant Access Valve Hose Connector . A
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.
A refrigerant valve core is
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" shall be interpreted as follows:
3.6.1Shall . Where "shall" or "shall not" is used for
a provision specified, that provision is mandatory if
compliance with the standard is claimed.
3.6.2Should, Recommended, or It is
Recommended . "Should", "recommended", or "it is
recommended" is used to indicate provisions
which are not mandatory but which are desirable
as good practice.
Section 4. Location Requirements
.010
MAX.
.035
MAX.
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 . With the core pin located within the limits
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].
ARI Standard 720-97
JB INDUSTRIES
630.851.9444
Printed in USA
© 2007 J/B Industries Inc.
Purpose.
3.5 Refrigerant Valve Core.
TM