1、Designation: F2324 13 An American National StandardStandard Test Method forPrerinse Spray Valves1This standard is issued under the fixed designation F2324; the number immediately following the designation indicates the year oforiginal adoption or, in the case of revision, the year of last revision.
2、A number in parentheses indicates the year of last reapproval. Asuperscript epsilon () indicates an editorial change since the last revision or reapproval.1. Scope1.1 This test method covers the water consumption flow rateand spray force of prerinse spray valves. The food serviceoperator can use thi
3、s evaluation to select a prerinse spray valveand understand its water consumption and spray force.1.2 The following procedures are included in this testmethod:1.2.1 Water consumption (see 10.2).1.2.2 Spray force test (see 10.3).1.3 The values stated in inch-pound units are to be regardedas standard.
4、 The values given in parentheses are mathematicalconversions to SI units that are provided for information onlyand are not considered standard.1.4 This test method may involve hazardous materials,operations, and equipment. It does not address all of thepotential safety problems associated with its u
5、se. It is theresponsibility of the users of this test method to establishappropriate safety and health practices and determine theapplicability of regulatory limitations prior to its use.2. Referenced Documents2.1 NSF Documents:2NSF Listings Food Equipment and Related Products, Com-ponents and Mater
6、ials, NSF International2.2 ASME Standard:3ASME A112.18.1/CSA B125.1 Plumbing Supply Fittings3. Terminology3.1 Definitions:3.1.1 prerinse spray valvea handheld device containing arelease to close mechanism that is used to spray water ondishes, flatware, etc.3.1.2 spray forcethe amount of force exerte
7、d onto thespray disc.3.1.3 test methoda definitive procedure for theidentification, measurement, and evaluation of one or morequalities, characteristics, or properties of a material, product,system, or service that produces a test result.3.1.4 uncertaintymeasure of systematic and precision er-rors i
8、n specified instrumentation or measure of repeatability ofa reported test result.3.2 Abbreviations:3.2.1 gpmgallons per minute.4. Summary of Test Method4.1 The flow rate of the prerinse spray valve is measured ata water pressure of 60 6 2 psi (413.7 6 13.8 kPa) and 60 610F (15.6 6 2.6C) to verify th
9、at the prerinse spray valve isoperating at the manufacturers rated flow rate. If the measuredflow rate is not within 5 % of the rated flow rate, all furthertesting ceases and the manufacturer is contacted. The manu-facturer may make appropriate changes or adjustments to theprerinse spray valve.4.2 T
10、he amount of force exerted by the prerinse spray valveis determined by the spray force test.5. Significance and Use5.1 The flow rate test is used to confirm that the prerinsespray valve is operating at the manufacturers rated flow rate atthe specified water pressure. The result from this test woulda
11、lso assist the operator in controlling the water and sewerconsumption and reduce water heating bills.5.2 The spray force is a measure of the impact from aprerinse spray valve on the target surface and can be used toselect a model that meets an end-users force profile.5.3 Flow rate and spray force ca
12、n be used along with spraypattern, coverage area, usage time, and flow control to select aprerinse spray valve that meets an end-users performancerequirements.6. Apparatus6.1 Analytical Balance Scale, or equivalent, for measuringthe weight of the water carboy. It shall have a resolution of 0.01lb (5
13、 g) and an uncertainty of 0.01 lb (5 g).1This test method is under the jurisdiction of ASTM Committee F26 on FoodService Equipment and is the direct responsibility of Subcommittee F26.06 onProductivity and Energy Protocol.Current edition approved June 1, 2013. Published July 2013. Originally approve
14、din 2003. Last previous edition approved in 2009 as F2324 03 (2009). DOI:10.1520/F2324-13.2Available from NSF International, P.O. Box 130140, 789 N. Dixboro Rd., AnnArbor, MI 48113-0140.3Available from American Society of Mechanical Engineers (ASME), ASMEInternational Headquarters, Three Park Ave.,
15、New York, NY 10016-5990, http:/www.asme.org.Copyright ASTM International, 100 Barr Harbor Drive, PO Box C700, West Conshohocken, PA 19428-2959. United States16.2 Calibrated Exposed Junction Thermocouple Probes,with a range from 50 to 200F (10 to 93.3C), with a resolutionof 0.2F (0.1C) and an uncerta
16、inty of 1.0F (0.5C), formeasuring water line temperatures. Calibrated K-type 24-GAthermocouple wire with stainless steel sheath and ceramicinsulation is the recommended choice for measuring the waterline temperatures. The thermocouple probe can be fed througha compression fitting so as to submerse e
17、xposed junction in thewater lines.6.3 Carboy, or equivalent container, for measuring theweight of the water during the flow rate test. A 5-gal (19-L)carboy water bottle has been found to be suitable (the carboyis the standard water bottle that is used for water coolers).NOTE 1The 5-gal (19-L) carboy
18、 container is the preferred container.With a narrow opening, the carboy captures all the water during the test athigher water pressure which can result in excess splashing.6.4 Force GaugeDigital force gauge with a maximumforce between 500 and 1000 g-force (1.1 and 2.2 lb-force) andan accuracy of 62
19、g-force (60.071 oz-force).NOTE 2When specifying a forge gauge, kilograms and grams are theindustry standard unit of measurement and will be used as an exception forthis specific test method. For this reason, ounce and pounds equivalentsare listed in parentheses.6.5 Hot Water Temperature Control Valv
20、e, to maintain andlimit mixed hot water to the prerinse spray valve during testing.It shall have a double throttling design to control both the hotand cold water supply to the mixed outlet. The flow character-istics of the valve shall have a resolution temperature control of64F (62C) combined with l
21、ow pressure drop check valvesin both the hot and cold water inlets to protect against crossflow.6.6 Pressure Gauge, for measuring pressure of water to theprerinse spray valve. The gauge shall have a resolution of 0.5psig (3.4 kPa) and a maximum uncertainty of 1 % of themeasured value.6.7 Spray DiscA
22、 10-in. diameter disc made of acrylic orsimilar material used as a target during the force test. The spraydisc will be rigidly attached to the force gauge and be 4.0 6 0.4oz (113.44 6 11.45 g) and at a thickness of 0.08 6 0.004 in.(2.03 6 0.1 mm).6.8 Spring-Style Prerinse Unit, Deck-Mounted, with a
23、36-in.(914.4-mm) flex hose which will have the testing sampleprerinse spray valve attach at the end of the flex hose. See Fig.1.6.9 Stopwatch, with a 0.1-s resolution.7. Reagents and Materials7.1 Water used will be from the local municipal watersupply.8. Sampling8.1 Prerinse Spray ValveThree represe
24、ntative productionmodels shall be selected for performance testing.9. Preparation of Apparatus9.1 Attach the prerinse spray valve to a 36-in., spring-style(flex tubing) prerinse spray valve in accordance with themanufacturers instructions. The minimum flow rate of the flextubing, with no prerinse sp
25、ray valve connected, shall be 3.5gpm (13.25 L/min) at a pressure of 60 6 2 psi (413.7 6 13.8kPa).NOTE 3Specifying a minimum flow rate for the flex tubing ensuresthat the prerinse spray valve is performing to the manufacturers specifi-cations and prevents the flex tubing from dictating the flow rate
26、of theprerinse spray valve.9.2 Connect the mixing valve to the municipal water supplyand set the mixing valve to maintain an outlet water tempera-ture of 60.0 6 10.0F (15.6 6 2.6C). The mixing valve shallbe located within 6 ft of the inlet of the flex tubing.9.3 Install a water line pressure regulat
27、or down stream ofthe mixing valve at the base of the flex tubing. Adjust thepressure regulator so that the water line pressure to the prerinsespray valve can be maintained at 60 6 2 psi (2.9 6 0.5 kPa)when water is flowing through the prerinse spray valve.9.4 Install a temperature sensor in the wate
28、r line downstream from the mixing valve. The sensors should be installedwith the probe immersed in the water. See Fig. 2 for aschematic of the setup for the water supply, mixing valve,pressure regulator, and gauge that are used for testing theprerinse spray valves.NOTE 4Install the thermocouple prob
29、e described in 9.4 downstreamfrom the temperature mixing valve and upstream from the prerinse sprayvalve. The thermocouple probe must be installed so that the thermocoupleprobe is immersed in the incoming water. A compression fitting orequivalent connection should be used to secure the thermocouple
30、withoutleaks or flow restriction.9.5 Force Test Apparatus:9.5.1 Rigidly attach a 10 6 0.25 in. (254 6 6.4 mm)diameter disc (spray disc) to the force gauge. An example of asuitable rigid connection is illustrated in Fig. 3, where a flat toptip is glued to the center of the spray disc.9.5.2 Securely m
31、ount the force gauge and spray disc appa-ratus such that the spray disc is positioned in a verticalorientation parallel to the face of the prerinse spray valve. Thecenter of the spray disc and center of the prerinse spray valvefaceplate are aligned on the same axis at 8.00 6 0.25 in. (203.26 6.4 mm)
32、 apart. See Fig. 4.FIG. 1 Illustration of Spring-Style, Deck-Mounted Prerinse SprayValveF2324 1329.5.3 The use of a splash guard is not necessary but may beincluded to help protect the force gauge from splashing water.Asplash guard of any design may be used, as long as the guarddoes not interfere wi
33、th the operation of the force test rig. Anexample of a suitable splash guard is as follows:9.5.3.1 An acrylic sheet 24 by 24 in. (610 by 610 mm) insize with a thickness of 0.08 in. (2.0 mm). The sheet has a 1-in.(25.4 mm) diameter hole in the center of the sheet, and a 0.5 in.(12.7 mm) wide slot cut
34、 in the sheet from one edge of the sheetto the center hole. The slot enables proper positioning of theforce gauge and 10-in. spray disc without the need to detachthe spray disc from the gauge. An example of a splash guardinstallation is shown in Fig. 5.9.5.3.2 The splash guard should be installed ve
35、rticallybetween the spray disc and the force gauge.FIG. 2 Sample Schematic of Water Lines and Test SetupFIG. 3 Attaching the Force Gauge to Spray DiscFIG. 4 Force Test Apparatus Diagram (Side View)F2324 13310. Procedure10.1 General:10.1.1 The following shall be obtained and recorded foreach run of e
36、very test:10.1.1.1 Water temperature (F),10.1.1.2 Dynamic water pressure (psi),10.1.1.3 Time (min), and10.1.1.4 Water flow rate (gpm).10.2 Prerinse Spray Valve Flow Rate Test:10.2.1 This procedure is comprised of a minimum of threeseparate test runs at the specified water temperature andpressure. Ad
37、ditional test runs may be necessary to obtain therequired precision for the reported test results (Annex 1). Thereported values of the flow rate test shall be the average of thetest runs.10.2.2 Ensure water is supplied at a flowing water pressureof 60 6 2 psi (413.7 6 13.8 kPa) and at a temperature
38、of 60.06 10.0F (15.6 6 2.6C).10.2.3 Weigh and record the weight of the empty carboyprior to testing (or equivalent 5-gal (19-L) container).10.2.4 Hold the prerinse spray valve over the opening of thecarboy container. Squeeze the prerinse spray valve handle toallow maximum flow and begin recording th
39、e time elapsed. Atthe end of 1 min, stop the water flow and record the weight ofthe water and container and subtract the weight of thecontainer. Use the weight of water to calculate the flow ratebased on the formula provided in 11.3.1.NOTE 5Maximum flow may not occur when the handle is fullydepresse
40、d.10.2.5 Repeat 10.2.2-10.2.4 two additional times. Addi-tional tests may be needed to obtain an uncertainty less than 10% by following the calculations in Annex A1.10.2.6 Report the average flow rate measured and confirmthat it is within5%ofthemanufacturers rated flow rate. If thedifference is grea
41、ter than 5 %, all further testing ceases and themanufacturer shall be contacted. The manufacturer may makeappropriate changes or adjustments to the prerinse spray valve.10.3 Spray Force Test:10.3.1 This procedure is comprised of a minimum of threeseparate test runs at the specified water temperature
42、 andpressure. Additional test runs may be necessary to obtain therequired precision for the reported test results (AnnexA1). Thereported values of the force test shall be the average of the testruns.10.3.2 Test the prerinse spray valve for force at a flowingwater pressure of 60.0 6 2.0 psi (413.7 6
43、13.8 kPa) while theprerinse spray valve is at its maximum flow rate and an averagewater temperature of 60.0 6 10.0F (15.6 6 2.6C).10.3.3 Prior to testing, calibrate the force gauge using thegauge manufacturers recommendations. The margin of errorin compression mode should not exceed 62 g-force (0.07
44、1oz-force). If the unit is out of calibration, make the necessaryadjustments to the force gauge.10.3.4 To begin the force test, initiate the flow of water fromthe prerinse spray valve toward the center of the test disc.10.3.5 Maintain water flow from the prerinse spray valve forat least 5 s or until
45、 force readings stabilize.10.3.6 After the prerinse spray valve has flowed for at least5 s, record the average force gauge measurement over the next15 s to the nearest 0.025 oz-force (0.7 g-force).10.3.7 If the prerinse spray valve has multiple modes, forceshall be tested in accordance with this tes
46、t procedure for eachmode.10.3.8 Repeat 10.3.2-10.3.6 an additional two times. Addi-tional tests may be needed to obtain an uncertainty less than 10% by following the calculations in Annex A1.10.3.9 The average force shall be determined from the testdata collected from the required sample size.11. Ca
47、lculation and Report11.1 Test Prerinse Spray ValveSummarize the physicaland operating characteristic of the prerinse spray valve.11.2 Apparatus and ProcedureConfirm that the testingapparatus conformed to all of the specifications in Section 9.Describe any deviations from those specifications.11.3 Fl
48、ow Rate Test:11.3.1 Calculate and report the nozzle flow rate based on:Qnozzle5Wwater8.337lbgalS1.000kgLD(1)where:Qnozzle= nozzle flow rate, gpm (L/min), andWwater= weight of the water collected in 1 min, lb (kg).11.3.2 Report the water temperature and water line pressure.11.4 Force Test:11.4.1 Repo
49、rt the force obtained from the digital forcegauge in ounces for each replicate of the prerinse spray valvestested.11.4.2 Calculate and report the average force of the nozzlestested in ounces (oz) to the nearest 0.1 oz-force (2.83 g-force).12. Precision and Bias12.1 Precision:12.1.1 Repeatability (within laboratory, same operator andequipment)The percent uncertainty in each result has beenspecified to be no greater than 65 %, based on at least threetest runs.FIG. 5 Force Test Apparatus Diagram (Front View)F2324 13412.1.2 Reproducibility (m
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