Standard for Refrigerant Access Valves and Hose Connectors

ARI Standard 720: Standard for Refrigerant Access Valves and Hose Connectors

In the critical domain of HVAC and refrigeration, ensuring the integrity of refrigerant systems is paramount. ARI Standard 720, "Standard for Refrigerant Access Valves and Hose Connectors," provides an essential framework for the design, manufacturing, and performance of these vital components. This authoritative standard, developed by the Air-Conditioning and Refrigeration Institute (ARI), offers a comprehensive approach to component interchangeability and reliable system service.

What is ARI Standard 720?

ARI Standard 720 establishes definitive requirements for refrigerant access valves and hose connectors used in refrigeration and air-conditioning systems. Originating from the need for standardized components within the industry, its primary purpose is to ensure that these parts are designed, manufactured, and perform to specific criteria, facilitating safe and efficient system servicing.

Scope & Purpose

This standard governs the design, dimensions, materials, and gaging procedures for 1/4 in SAE flare refrigerant access valves and associated hose connectors intended for use with volatile refrigerants. It defines critical aspects like valve core pin location, hose connector depressor positioning, and material compatibility. Notably, it excludes refrigerant access valves and hose connectors of sizes other than 1/4 in SAE flare, focusing its comprehensive coverage on this specific, widely used interface.

Who Must Comply?

• • Primary audience: Mechanical Engineers, Product Designers, Quality Control Inspectors, and HVAC Technicians involved in the design, manufacturing, or servicing of refrigeration and air-conditioning systems.
• • Industries affected: HVAC & Refrigeration, Automotive, and Appliance Manufacturing sectors.
• • Compliance nature: Voluntary, but conformance claims must meet all standard requirements.
• • Enforcement: Typically self-policed by manufacturers and verified by customers or regulatory bodies where applicable.

Key Requirements Overview

Professionals working with ARI Standard 720 will encounter several core requirements:

• • The standard mandates specific dimensional tolerances for valve bodies and valve cores to ensure interchangeability between different manufacturers.
• • It details the precise positioning requirements for the moveable valve core pin within the valve body, ensuring proper sealing and activation by hose connectors.
• • Key provisions include specifying material compatibility for seals with volatile refrigerants and associated oils to prevent degradation.
• • The standard outlines acceptable gaging procedures, such as plug and ball gaging, to verify critical dimensions and functionality.
• • Marking and nameplate data requirements are specified to ensure clear identification of the product and its intended use.

Related Standards & References

ARI Standard 720 often works in conjunction with other crucial industry documents. Complementary standards include ASHRAE Terminology of Heating, Ventilation, Air Conditioning and Refrigeration for defining terms, and ANSI/SAE Standard J513f which provides essential specifications for flare fittings, ensuring broader system compatibility and proven design principles. These references collectively contribute to a robust and reliable framework for refrigerant system components.