Effective August 22, 2017

Standard Information
Standard Number:
ANSI Z21.21 \ CSA 6.5
Standard Name:
Automatic valves for gas appliances
Standard Edition and Issue Date:
5th Edition Issued 2015
Date of Revisions:
5th Edition Issued 2015
Date of Previous Revisions to Standard:
4th Edition Issued 2012
Effective Date of New/Revised Requirements

Effective Date (see Processing Schedule below): August 22, 2017

Impact, Overview, Fees and Action Required

Impact Statement: A review of all Listing Reports is necessary to determine which products comply with
new/revised requirements and which products will require re-evaluation. NOTE: Effective immediately, this revised standard will be exclusively used for evaluation of new products unless the Applicant requests in writing that current requirements be used along with their understanding that their listings will be withdrawn on Effective Date of August 22, 2017 unless the product is found to comply with new/revised requirements.

Overview of Changes: Construction requirements, test parameters. Specific details of new/revised requirements are found in table below.

If the applicable requirements noted in the table are not described in your report(s), these requirements will need to be confirmed as met and added to your report(s) such as markings, instructions, test results, etc. (as required).

Processing Schedule: So that production of products bearing Listing Marks will not be interrupted, the following schedule of approximate dates has been established to ensure Listing Reports are found compliant by Effective Date:

  • December 22, 2016 = 8 Month Report Review – Intertek will review all Reports. Update if compliance is verified or issue Findings Letter/Quote for any re-evaluations needed
  • February 22, 2017= 6 Month Quote Cut-off – Quotes returned for necessary re-evaluations
  • July 21, 2017 = 30 Day Warning – Client advised of all non-compliant Reports to be Suspended
  • August 22, 2017 = Effective Date – ATM Suspended for all non-compliant Reports

Fees: An initial review of Listing Report (s) will be covered by a direct billing project and will be invoiced at not more than $1000 per report.

Client Action Required:

Information – To assist our Intertek Engineer with review of your Certification Reports, please submit technical information in response to the new/revised paragraphs noted in the attached or explain why these new/revised requirements not apply to your product (s).

Current Listings Not Active? – Please immediately identify any current Listing Reports or products that are no longer active and should be removed from our records. We will do this at no charge as long as Intertek is notified in writing prior to the review of your reports.

Description of New/Revised Technical Requirements
  Additions to existing requirements are underlined and deletions are shown lined out below.
1.3  This Standard applies to automatic valves having maximum operating gas pressure ratings from ½ psi (3.5 kPa) up to and including 60 psi (413.7 kPa). This Standard also applies to C/I valves having maximum operating gas pressure ratings of ½ psi (3.5 kPa) or greater (see Clauses 6 and 7).
1.11  In this Standard, “shall” is used to express a requirement, i.e., a provision that the use shall satisfy in order to comply with the standard; “should” is used to express a recommendation or that which is advised by not required; and “may” is used to express an option or that which is permissible with the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of a note accompanying a clause is to separate from the text explanatory or informative material.
Notes to tables and figures are considered part of the table or figure and may be written as requirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define their application.
Table 4
(Leakage Test Pressure)
 Relocated Table 4, reformatted and changed Maximum test pressure

For ½ psi (3.48 kPa) From: ¾ psi (5.23 kPa)
For 2 psi (13.8 kPa) From: 3 psi (20.7 kPa)
For 5 psi ( 34.5 kPa) From: 7.5 (51.7 kPa)

To: ½ psi up to and including 5psi (3.5 kPa up to and including 34.5 kPa)
Table 5
Capacity test pressures and pressure drops
 Relocated Table 5 and changed Maximum pressure rating

For ½ psi (3.5 kPa) 1.0 in wc (249 249 kPa)
For 2 psi (13.8 kPa), 5 psi and over (in 34.5 kPa) increments to a maximum of 60 pis (413.7 kPa)

For ½ psi (3.5 kPa) 1.0 in wc (249 249 kPa)
Greater than ½ psi 10 percent of maximum pressure rating or as specified by the
Table 7
Inlet test pressure for integrity of operation tests for automatic valves
 Relocated Table 7 and changed pressure rating

For ½ psi (3.5 kPa) 1.0 in wc (249 249 kPa)
For 2 psi (13.8 kPa), 5 psi and over (in 34.5 kPa) increments to a maximum of 60 pis (413.7 kPa)

For ½ psi (3.5 kPa) 1.0 in wc (249 249 kPa)
Greater than ½ psi 25 percent of pressure rating
6.11 A C/I valve shall utilize female pipe threads complying with Clause 4.4.1 or flange connections complying with Clause 4.4.6 except there is no Class 125 limitation for iron valves. Connections using male threads or tubing shall not be permitted.
7.3.3 There shall be no sticking of the valve nor shall the valve become otherwise inoperative.
Upon completion of the required cycles, the valve shall:
(a) Comply with clause 5.4, Leakage;
(b) Comply with clause 7.4, Closing Time; or and
(c) Comply with clause 5.8, Dielectric Strength.
If the valve incorporates a proof-of-closure switch, it shall comply with clause 6.12.
Electric switches shall be operative.

CUSTOMERS PLEASE NOTE: This Table and column "Verdict" can be used in determining how your current or future production is or will be in compliance with new/revised requirements.

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