June 26, 2009



June 26, 2009

SUMMARY OF REQUIREMENTS

The following is a brief summary of the new and revised paragraphs in the Standard for Flow Control Valves For Anhydrous Ammonia And LP-Gas, UL 125, which have a future Effective Date of June 10, 2011 and the action that may be required to determine compliance.

|Para/ |New or Revised Wording |Impact |Comment |

|Sections | | | |

|Title |Flow Control Valves for Anhydrous Ammonia and LP-Gas |No Impact |New title is more descriptive of the |

| | | |type of valves covered. New Edition |

| | | |was issued because of major additions|

| | | |to address the many types of valves |

| | | |covered. |

|1.1 |These requirements cover the following types of anhydrous ammonia and liquefied|No Impact |Editorial to better reflect the |

| |petroleum gas (LP-Gas) valves that are used to control the flow of liquid | |application for these valves |

| |and/or vapor into and out of containers, or in piping systems between | | |

| |containers, or between containers and utilization equipment, and are for use at| | |

| |temperatures within the range of minus 40°F (minus 40°C) to 130°F (55°C) | | |

|1.1 a-j |a)     Shut-off Valves (primary or secondary, and manual or automatic), |No Impact |The standard has been expanded to |

| |b)     Excess Flow Valves, | |document historical requirements for |

| |c)     Back Pressure Check Valves, | |LP-Gas and NH3 valves used for flow |

| |d)     Filler Valves, | |control. |

| |e)     Vapor Return Valves, and | | |

| |Actuated Liquid Withdrawal Excess-Flow Valves; | | |

| |Multiple function valves; | | |

| |Internal valve; | | |

| |Emergency shutoff valve; and | | |

| |Lever operated transfer valve. | | |

|1.3 |These requirements do not cover shut-off valves of the type commonly referred |No Impact |This standard does not cover cylinder|

| |to as "cylinder valves" used on containers constructed under Department of | |valves but references UL1769 for such|

| |Transportation (DOT) Specifications. Requirements for these valves are | |requirements. |

| |contained in the Standard for Cylinder Valves, UL 1769. | | |

|1.4 |These requirements do not cover safety relief valves. Requirements for these |No Impact |This standard does not cover relief |

| |valves are contained in the Standard for Safety Relief Valves for Anhydrous | |valves but references UL132 for such |

| |Ammonia and LP Gas, UL 132. | |requirements. |

| | | | |

| | | | |

|Para/ |New or Revised Wording |Impact |Comment |

|Sections | | | |

|1.5 |These requirements do not cover automatic shutoff valves that use electricity |No Impact |Excludes electrically operated |

| |to actuate the valve member. Requirements for these valves are contained in the| |valves. Those valves covered by |

| |Standard for Electrically Operated Valves, UL 429. | |UL429. |

|1.8 |Except for such observations as are required to ascertain performance |No Impact |Editorial – clarifies that excess |

| |characteristics, the assigning of pressure and/or flow capacity ratings, other | |flow valves do have a flow capacity |

| |than for excess flow valves, is not within the scope of these requirements. | |rating. |

|1.9 |A product that contains features, characteristics, components, materials, or |No impact |UL requirements are not intended to |

| |systems new or different from those covered by the requirements in this | |address issues specific to the |

| |standard, and that involves a risk of fire or of electric shock or injury to | |certification of a product, therefore|

| |persons shall be evaluated using appropriate additional component and | |this paragraph is being deleted. |

| |end-product requirements to maintain the level of safety as originally | | |

| |anticipated by the intent of this standard. A product whose features, | | |

| |characteristics, components, materials, or systems conflict with specific | | |

| |requirements or provisions of this standard does not comply with this standard.| | |

| |Revision of requirements shall be proposed and adopted in conformance with the | | |

| |methods employed for development, revision, and implementation of this | | |

| |standard. | | |

|2.1 |The service pressure rating of a valve intended for use in anhydrous ammonia |No impact |No change in intent. Separating out |

| |and/or LP-Gas service shall not be less than 250 pounds per square inch (psi) | |LP-Gas from NH3 valves. |

| |(1.7 MPa) and shall not exceed 1/5 of its rupture hydrostatic strength test | | |

| |pressure. | | |

|2.2 |The service pressure rating of a valve intended for use in LP-Gas service shall|No impact |Three pressure ratings will now be |

| |not exceed 1/5 of its hydrostatic strength test pressure and shall be in | |allowed for valves for LP-Gas as |

| |accordance with Table 2.1. | |indicated by new table 2.1, but this |

| |(NEW) Table 2.1 | |will not impact currently Listed |

| |Service pressure rating of LP-Gas valves | |valves. |

| | | | |

| |Service | | |

| |Minimum pressure rating | | |

| | | | |

| |LP-Gas vapor at operating pressure of 125 psi (0.9 MPa) gauge or less | | |

| |125 psi (0.9 MPa) gauge | | |

| | | | |

| |LP-Gas liquid, or vapor at operating pressure over 125 psi (0.9 MPa) gauge and | | |

| |at or below container pressure | | |

| |250 psi (1.7 MPa) gauge | | |

| | | | |

| |Higher than container pressure | | |

| |350 psi (2.4 MPa) gauge, or the MAWP, whichever is higher | | |

| | | | |

|Section 4 | |No impact |Definitions consistent with previous |

| |Glossary. A new glossary section has been included in 8th Edition to define | |and current requirements. |

| |the valves covered by the standard. (The entire glossary has not been | | |

| |included. See 8th Edition) | | |

|5.3 |An internal type valve, for which the mating flange is provided as part of the |No impact |Moved requirement to a new Section |

| |container in which the valve is to be installed is not required to comply with | |devoted to internal valves – No |

| |4.2. | |change in requirements |

|5.7 |Two or more subassemblies intended to be assembled in the field as a unit shall|No impact |Clarified historical requirement. |

| |be capable of being joined together without requiring any of the subassemblies | | |

| |to be cut, drilled, or welded. | | |

|Para/ |New or Revised Wording |Impact |Comment |

|Sections | | | |

|5.8 |The construction of a valve shall be such that parts can be reassembled after |No impact |Clarified historical requirement. |

| |being dismantled to the extent provided for routine maintenance. | | |

|6.1 |An operating or Liquid pressure-confining parts of a valve or operating parts |Review Needed|See Explanation for 6.2 below. |

| |shall have the strength and durability to provide reliable service of the parts| | |

| |and of the assembly, when failure of the part allows leakage or hazardous | | |

| |operation. | | |

|6.2 |To determine compliance comply with 6.1, a material (except a valve disc or |Review Needed|Materials for fluid confining parts |

| |soft seat, a seal ring, a diaphragm, or a gasket) is to have a for | |of valves except for valves |

| |pressure-confining parts of a valve for direct connection to a container or | |identified in exception 1, having a |

| |having a pressure rating of 250 psig or higher shall have a minimum melting | |lower melting point than 1500 F are |

| |point (solidus temperature) of not less than 950°F (510°C) 1500°F (816°C) and a| |not to be allowed as noted in NFPA |

| |tensile strength of no less than 10,000 psi (68.9 MPa) at 400°F (204°C). | |58. Exception 3 allows handwheels, |

| | | |handles and levers on valve sizes not|

| |Exception No. 1: Valves that are part of a meter assembly, lever operated | |greater than ½ in pipe size to have |

| |transfer valves and LP-gas hose nozzle valves shall have a melting point | |materials with less than 950 F |

| |(solidus temperature) of not less than 950°F (510°C) and a tensile strength of | |melting point |

| |not less than 10,000 psi (68.9 MPa) at 400°F (204°C). | | |

| | | | |

| |Exception No. 2: A valve disc or soft seat, a seal ring, a diaphragm, or a | | |

| |gasket is not required to comply with this requirement. | | |

| | | | |

| |Exception No. 3: A handle or lever on a shut off service valve having an inlet | | |

| |connection not greater than ½ in. NPT and not directly connected to a container| | |

| |is not required to comply with this requirement. See Section 38. | | |

|6.3 |To comply with 6.1, a material for pressure-confining parts of valves having a |No impact |This requirement is not changed from |

| |pressure rating of less | |the 7th Edition, which appeared as |

| |than 250 psig and for other than direct connection to a container, and | |5.2, but now applies to valves with a|

| |operating parts of all valves shall | |pressure rating less than 250 psig. |

| |have a melting point (solidus temperature) of not less than 950°F (510°C) and a| | |

| |tensile strength of not | | |

| |less than 10,000 psi (68.9 MPa) at 400°F (204°C). | | |

| |Exception: A valve disc or soft seat, a seal ring, a diaphragm, or a gasket is | | |

| |not required to comply with | | |

| |this requirement. | | |

|6.4 |A part in contact with the liquid fluid to be handled shall be resistant to the|No impact |Changed “liquid” to “fluid” to cover |

| |action of such liquid fluid. | |both vapor and liquid phases of |

| | | |LP-Gas and NH3 |

|6.7 |A synthetic rubber part intended to be in contact with the liquids indicated in|No impact |No change of requirements. Making |

| |Table 5.1 shall not show | |reference to the performance section |

| |excessive volume change or loss of weight, when evaluated on the basis of its | |of the standard. Table 6.1 is being |

| |intended function, following | |moved to a new performance section. |

| |immersion for 70 hours in the specified test liquid. See the Volume Change | | |

| |Test, Section 23, and the | | |

| |Weight Loss Test, Section 24. With reference to 6.3 elastomeric materials shall| | |

| |be subjected to the following tests: | | |

| |a) Accelerated Aging Test, Section 30; | | |

| |b) Fluid Compatibility Test, Section 32; and | | |

| |c) Low Temperature Test, Section 33. | | |

| |Polymeric materials shall be subjected to the Accelerated Aging Test, Section | | |

| |30 and the Fluid Compatibility Test, Section 32. | | |

| |Exception: Acetal polymers, chlorotrifluorethylene polymers, | | |

| |tetrafluorethylene, fluorinated ethylene | | |

| |propylene polymers and polyamides of composition polyhexamethylene adipamide or| | |

| |polycaproamide | | |

| |polymers (nylon 6, 6/6 or 6/16) shall only be subjected to the Accelerated | | |

| |Aging Test. | | |

| |Table 6.1 is deleted here and moved to New Section 32. | | |

|6.8 |Paragraph is deleted here, but and moved to performance section. See New |No impact |No Change of requirements. Moving |

| |Section 32 | |requirements to the performance |

| | | |section of the standard |

|6.9 |Paragraph deleted and moved to performance section. |No impact |Re-organized standard and made |

| | | |reference to tests in performance |

| | | |Section. No change in requirements |

|9.2 |Two types of shut-off valve service are contemplated by these requirements: |No impact |No change in requirements, however, |

| |a) Primary Service and | |the paragraph is being deleted |

| |b) Secondary Service. | |because it is an installation |

| |Primary service valves are those suitable for installation where a positive | |requirement. The seat leakage test |

| |shut-off is required. Secondary service valves are those suitable for | |describes requirements for secondary |

| |installation only in branch or bypass piping where a positive shut-off is not | |service valves. |

| |essential. | | |

|9.3 |A shutoff valve shall not be equipped with a bypass or with a means to prevent |No impact |Clarified historical requirement. |

| |it from closing completely. | | |

| |Exception: This requirement does not apply to a feature provided to permit a | | |

| |take-off to re-circulate fluid or to supply a pilot or other individually | | |

| |controlled outlet. | | |

|9.9 |For shutoff valves and shutoff valve portion of filler valves with handwheels, |Review Needed|Shutoff valves with handwheels and |

| |the handwheel and valve stem shall be so constructed so that it shall not | |stems shall be subjected to the stem |

| |fracture, break, crack or have stem threads stripped, in the open and closed | |torque Test, Section 39 |

| |position when subjected to the Valve Stem Torque Test, Section 39. | | |

|Section 10 |New Section 10 now describes requirements for automatic shutoff valves that use|No impact |Documents historical requirements. |

| |non-electrical energy to open and close valves. See 8th Edition of Standard | |Standard will now cover automatic |

| |for actual wording. | |valves, other than electrically |

| | | |operated |

|13.1d | |No impact |Documents historical requirements |

| |13.1 A filler valve shall incorporate one of the following: | | |

| |d) A positive shutoff valve with an internal excess flow valve. | | |

|Section 16 | |No impact |Documents historical requirements for|

| |New Section 16 now describes requirements for multiple function valves. See | |multiple function valves. |

| |8th Edition of Standard for actual wording. | | |

|Section 17 |New Section 17 now describes requirements for internal valves. See 8th Edition|No impact |Documents historical requirements for|

| |of Standard for actual wording. | |internal valves. |

|Section 18 |New Section 18 now describes requirements for emergency shutoff valves. See |No impact |Documents historical requirements for|

| |8th Edition of Standard for actual wording. | |emergency shutoff valves. |

|Section 19 |New Section 19 now describes requirements for multiple function valves. See |No impact |Documents historical requirements for|

| |8th Edition of Standard for actual wording. | |lever operated and LP-Gas hose nozzle|

| | | |valves. |

|20.1 | |No impact |Documents historical requirements. |

| |Representative samples of each size and type of valve are to be subjected to | |Testing of representative sizes is |

| |the tests described in these requirements. When a series of shutoff or | |permitted by the standard. |

| |backpressure check valves are to be investigated in which the valves differ in | | |

| |size only, and all sizes have the same pressure rating, three representative | | |

| |samples are to be chosen to include the largest, smallest, and one intermediate| | |

| |size. Additional samples of parts constructed of nonmetallic materials, such as| | |

| |seal materials and valve seat discs, are required for physical and chemical | | |

| |tests. | | |

|22.1 |A valve in the ″as-received″ condition shall be free from leakage through stem |No impact |Revisions are editorial in nature – |

| |or body seals or other joints, and shall not show evidence of porosity in | |no change in requirements. This |

| |castings when tested as described in 22.2 at any aerostatic pressure between 0 | |change is consistent with new 2.2. |

| |and 1-1/2 times the rated service pressure of the valve. | | |

| |a) 0 and 375 psi (0 and 2,588 kPa) or | | |

| |b) 0 and 1-1/2 times the rated service pressure of the valve, whichever is | | |

| |greater. | | |

|24.2 |The seat of a shut-off valve intended for primary service, when in the closed|No impact |Revisions to 24.2 are editorial in|

| |position, shall be free from leakage at any aerostatic pressure between 0 and| |nature – no change in |

| |1-1/2 times the rated service pressure of the valve. | |requirements, and are consistent |

| |a) 0 and 375 psi (0 and 2,588 kPa) or | |with new 2.2. |

| |b) 0 and 1-1/2 times the rated service pressure of the valve, whichever is | | |

| |greater. | |Exception to 24.2 recognizes that |

| |Exception: Internal valves shall be free from leakage at any aerostatic | |internal valves do not require |

| |pressure between 0 and 1.0 times | |test to be done at 1-1/2 times |

| |the rated service pressure of the valve. | |because of the seat construction. |

|24.3 |The seat of a shut-off valve intended for secondary service, when in the |No impact |Revisions are editorial in nature |

| |closed position, shall not show a rate of leakage of more than 2 cubic feet | |– no change in requirements. This|

| |per hour (0.02 dm3/s) when subjected to any aerostatic pressure between 0 and| |change is consistent with new 2.2.|

| |1-1/2 times the rated service pressure of the valve. | | |

| |a) 0 and 375 psi (0 and 2,588 kPa) or | | |

| |b) 0 and 1-1/2 times the rated service pressure of the valve, whichever is | | |

| |greater. | | |

|24.4 |A back pressure check valve provided with a resilient seat, when in the |No impact |Revisions are editorial in nature |

| |closed position, shall not leak when subjected to any aerostatic pressure | |– no change in requirements. This|

| |between 20 psi (138 kPa) and 1-1/2 times the rated service pressure of the | |change is consistent with new 2.2.|

| |valve. | | |

| |a) 20 and 375 psi (138 and 2,588 kPa) or | | |

| |b) 20 psi (138 kPa) and 1-1/2 times the rated service pressure of the valve, | | |

| |whichever is greater. | | |

|24.5 |A back pressure check valve provided with a metal-to-metal seat, when in the |No impact |The change in requirements is |

| |closed position, shall not leak at a rate exceeding 1 cubic foot per minute | |based upon circumference of seat |

| |(0.47 dm3/s) 0.6 cfm/inch seat circumference when subjected to an aerostatic | |area. Essentially no change in |

| |pressure of 20 psi (138 kPa). | |base requirement. |

|24.8 |Seat leakage tests for shutoff valves are conducted with the inlet of the |No impact |Clarification in test method based|

| |sample valve connected to a source of aerostatic pressure, with the valve in | |on type of valve. No change in |

| |the closed position, and with the outlet open. For an internal valve, the | |requirement. |

| |source of pressure is applied to the container portion of the valve with the | | |

| |valve member in the closed position and the inlet open. For a back pressure | | |

| |check valve, the source of pressure is applied in the reverse flow direction.| | |

| |A positive shut-off valve and a pressure gauge having a pressure range of no | | |

| |less than 1-1/2 times, nor more than 2 times, the test pressure are to be | | |

| |installed in the pressure supply piping. The pressure gauge is to be | | |

| |installed between the shut-off valve and the sample under test. While under | | |

| |the applied test pressure, observations for leakage are to be made with the | | |

| |open outlet submerged in water unless otherwise indicated. | | |

|25.1 with |A manual shut-off valve, and an automatically closing, manual-reset valve, |No impact |Clarification in test cycles and |

|Exceptions |shall be capable of complying with the applicable leakage test requirements | |test method based on type of |

|1, 2, 3 and |of 22.1 and 24.2, or 22.1 and 24.3, after being subjected to 6,000 the number| |valve. Documents historical |

| |of cycles of opening and closing under the test conditions described in 25.2 | |requirements. |

| |– 25.6. There shall be no sticking of the valve, nor shall the valve become | | |

| |inoperative. Required corrosion protection shall not be impaired. All other | | |

| |valves that are opened and closed using other than manual operation or having| | |

| |automatic features shall perform as intended for at least 100,000 cycles of | | |

| |operation. The test shall be performed as indicated in Table 25.1 for the | | |

| |various types of shutoff valves. There shall be no sticking of the valve, nor| | |

| |shall the valve become inoperative. Required corrosion protection shall not | | |

| |be impaired. Rotating stem type valves employing the stuffing box design | | |

| |discussed under 9.5 shall be permitted to be adjusted following the endurance| | |

| |conditioning and during leakage testing. Following any adjustment, the valve | | |

| |shall be capable of being opened and closed by hand. | | |

| |Exception: Rotating stem type valves employing the stuffing box design | | |

| |discussed under 8.4 are not required to be subjected to this test. | | |

| |Exception No. 1: Internal valves shall be subjected to 6,000 cycles. | | |

| |Exception No. 2: Emergency shutoff valves shall be subjected to 6,000 cycles.| | |

| |Exception No. 3: Excess flow and back pressure check valves are not subjected| | |

| |to this test. | | |

|Table 25.1 |Number of cycles for shutoff valve types |No impact |Clarification in test cycles and |

| | | |test method based on type of |

| |Valve type | |valve. Documents historical |

| |Number of cycles | |requirements. |

| | | | |

| | | | |

| |Manual Valves, Internal Valves or Emergency Shutoff Valves, with or without | | |

| |Actuators, and automatic closing, manual reset valves | | |

| | | | |

| |6,000 | | |

| | | | |

| | | | |

| |Lever Operated Fuel Transfer Valves | | |

| | | | |

| |30,000 | | |

| | | | |

| | | | |

| |LP-Gas Hose Nozzle Valves and All Other Shutoff Valves With Actuators, and | | |

| |Automatic Shutoff Valves | | |

| | | | |

| |100,000 | | |

| | | | |

|25.3 | |No impact |Revisions now allow valves to be |

| |A shut-off valve for use only with LP-Gas that has a pressure rating of 250 | |rated at 125 psig. Changes to |

| |psi (1.7 MPa) gauge or higher, or one for use with either LP-Gas or anhydrous| |this paragraph clarify testing to |

| |ammonia, is to be tested with the valve outlet plugged, the valve body filled| |the correct pressure rating. This|

| |with n-hexane, and the valve inlet subjected to a pressure of 250 psi (1.7 | |change is consistent with new 2.2.|

| |MPa) gauge. If the shutoff valve for LP-Gas service has a rating of 125 psig,| | |

| |the test is conducted with n-hexane and the valve inlet subjected to a | | |

| |pressure of 125 psi (0.9 MPa) gauge. | | |

|25.5 | |No impact |Clarifies historical requirement |

| |An endurance test is to be conducted at a rate no faster than 10 times per | | |

| |minute. For a shut-off valve, the closing torque is to be consistent with the| | |

| |size of the handwheel, wrench, or other means used to operate the valve. | | |

| |Shutoff valves with an adjustable packing nut are allowed one adjustment | | |

| |during the endurance test. | | |

|26.1 |A valve shall be capable of withstanding, without rupture or permanent |No impact |Revisions now allow valves to be |

| |distortion, a hydrostatic pressure of 1250 psi (8.6 MPa) or 5 times the rated| |rated at 125 psig. Changes to |

| |service pressure of the valve, whichever is greater. See 2.1 Service Pressure| |this paragraph clarify testing to |

| |Rating, Section 2 | |the correct pressure rating. This|

| | | |change is consistent with new 2.2.|

|Section 27 | |No impact |Clarifies historical requirements |

| |There were many minor changes to the Operation Test method, which clarified | |and methodologies. |

| |historical methodologies, such as, the flow rating is the average of all | | |

| |trials in all flow directions, small valves are permitted to have vapor | | |

| |rating only, clarification to instrumentation and flow test equipment and | | |

| |other minor changes. See New 8th edition, Section 27 for actual wording | | |

| |changes. | | |

|Section 29 | |No impact |No change in requirements. |

| |Volume Change Test Method is being deleted because the test method is covered| | |

| |by UL157, which is now referenced in Section 32. | | |

|Section 30 |Accelerated aging test is now covered in this section, under the performance |No impact |No change in requirements. This |

| |section of the standard. It was taken from Section 5 of the 7th edition. | |section now documents historical |

| | | |requirements for polymeric parts |

|Section 31 | |No impact |No change in requirements. |

| |Weight Loss Test is being deleted because the test method is covered by | | |

| |UL157, which is now referenced in Section 32. | | |

|Section 32 |New Section 32 was taken from Section 5 of the 7th edition. |No impact |No change in requirements. This |

| | | |section now documents historical |

| | | |requirements for polymeric parts |

|33.3 |When the elastomeric part does not comply with the requirements in 33.1, the |No Impact |Changes to this test method |

| |following alternate test may be conducted. One complete valve assembly is to | |recognize that LP-Gas and NH3 have|

| |be placed in a cold chamber maintained at minus 40 ±2°F (minus 40 ±1°C) for | |a much lower pressure at –40 F |

| |24 hours, removed, manually operated for 25 cycles consisting of complete | |temperature. The test pressure is|

| |opening and closing, and then returned to the cold chamber for 1 hour. (When | |consistent with this temperature. |

| |the elastomeric part is a static seal, the 25-cycle operation test is not | | |

| |conducted.) Immediately after the 1 hour exposure, the valve assembly is to | | |

| |be subjected to the External Leakage Test, Section 22, and the Seat Leakage | | |

| |Test, Section 24, as appropriate, using a test pressure of 30 psig. The | | |

| |leakage rate shall comply with the requirements specified for these tests. | | |

|Section 35 |Documents Thermal Link Operation Test. See new edition for specific wording.|No Impact |Documents historical requirement |

| | | |and test method. |

|Section 36 |Documents Fire Test. See new edition for specific wording. |No Impact |Documents historical requirement |

| | | |and test method. |

|Section 37 |Documents Drop Test. See new edition for specific wording. |No Impact |Documents historical requirement |

| | | |and test method. |

|Section 38 |Documents Impact Test. See new edition for specific wording. |No Impact |Documents historical requirement |

| | | |and test method. |

|Section 39 | |Review Needed |New Torque Test for shutoff valves|

| |39.1 Six production samples shall be tested, three each in the opened and | |with handwheels. |

| |closed position. Each sample shall comply with 9.9. The torque in in-lbs that| | |

| |shall be applied to each sample shall be in accordance with the following | | |

| |equation: | | |

| |T = 50 X D (handwheel diameter in inches) | | |

| | | | |

| |39.2 A torque wrench shall be applied to each of 3 sample valve handwheel and| | |

| |torque be applied in the closed position. A torque wrench shall be applied to| | |

| |each of 3 sample valve handwheel and torque be applied in the opened | | |

| |position. | | |

|41.1 c and e |41.1 |No Impact |UL Listings have not previously |

| |c) The rated service pressure when the rating is not in excess of 250 psi | |covered valves covered by par. |

| |(1.7 MPa), and | |41.1 (c) or (e). |

| |d) The direction of flow, when not evident. | | |

| |e) Valves for secondary service, in accordance with 9.2 and 24.3 shall be so | | |

| |marked. | | |

|41.2 | |No Impact |Clarifies historical requirements.|

| |Each excess flow valve shall be marked with its rated closing flow capacity | | |

| |in gallons per minute (m3/s) of liquid anhydrous ammonia or LP-Gas (propane),| | |

| |or both, when appropriate. An excess flow valve having only a vapor rating in| | |

| |accordance with the exception to 27.2 shall have its flow capacity in cubic | | |

| |feet per hour or liters per minute of gaseous anhydrous ammonia or LP-Gas | | |

| |(propane), or both, when appropriate marked on the valve. When the rated | | |

| |closing flow used to determine compliance with 27.1 is dependent upon | | |

| |mounting position, the marking shall include reference to the direction of | | |

| |flow mounting position. | | |

|41.3 | |No Impact |Clarifies historical requirements.|

| |All markings shall be legible and permanent, such as afforded by metal | | |

| |stamping, by molding in a casting, or by a metal nameplate, or printed on a | | |

| |pressure sensitive label(s) secured by adhesive. To determine when a | | |

| |pressure-sensitive label, or label secured by cement or adhesive is of a | | |

| |permanent nature, representative samples are to be subjected to exposure | | |

| |conditions for outdoor use (standard atmospheric, water immersion, oven | | |

| |aging, low temperature, ultraviolet light, and water exposure), in accordance| | |

| |with the Standard for Marking and Labeling Systems, UL 969. | | |

|41.6 |For a nonself-closing type valve, the appropriate operating positions or the |No Impact |Clarifies historical requirements.|

| |direction of movement shall be clearly indicated for a manual operating lever| | |

| |or reset handle. | | |

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