ASME A112.1002 pdf free download

ASME A112.1002 pdf free download Anti-siphon fill valves for water closet tanks
Section l1 Scope1.1
This Standard covers anti-siphon fill valves intended to be installed in water closet tanks.Note: ln this Standard, anti-siphon fill valves are also referred to as “devices”.
1.2
In this Standard,” shall””is used to express a requirement, i.e., a provision that the user is obliged tosatisfy in order to comply with the standard; ” should” is used to express a recommendation or thatwhich is advised but not required; and “may” is used to express an option or that which is permissiblewithin the limits of the standard.
Notes accompanying clauses do not include requirements or alternative requirements; the purpose of anote 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 asrequirements.
Annexes are designated normative (mandatory) or informative (non-mandatory) to define theirapplication.
1.3
Sl units are the units of record in Canada. In this Standard the inch/pound units are shown inparentheses.
The values stated in each measurement system are equivalent in application; however, each system is tobe used independently.Combining values from the two measurement systems can result in non-
conformance with this Standard.
All references to gallons are to U.S.gallons.
2 Reference publications and definitions2.1 Reference publications
This Standard refers to the following publications, and where such reference is made, it shall be to theedition listed below, including all amendments published thereto.
ASME(American Society of Mechanical Engineers)/csA GroupASME A112.18.1-2018/CSA B125.1-18
Plumbing supply fittings
ASME A112.19.2-2018/CSA B45.1-18Ceramic plumbing fixtures
AsME(American Society of Mechanical Engineers)ASME B1.1-2003 (R2018)
Unified lnch Screw Threads, (UN and UNR Thread Form)ASSE International
ASSE Plumbing Dictionary, Sixth Edition, 2007
2.2 Definitions
In addition to the definitions in ASME A112.18.1/CSA B125.1 and the ASSE Plumbing Dictionary, thefollowing definitions shall apply in this Standard:
Anti-siphon fill valve — a valve that is used to supply water for flush tank refill and, where applicable,trap reseal. The device has an air gap, integral mechanical backflow preventer, or vacuum breaker toprevent the backflow of water from the flush tank into the supply system. The device is operated by afloat or similar activation method.
Retrofit device — any replacement fill valve not specifically supplied by the original equipmentmanufacturer of the water closet tank.
2.3 Abbreviations
The following abbreviation shall apply in this Standard:cL – critical level
Section lII
3 Design and general requirements
3.1 Pressure
Devices shall be designed to function at a supply pressure range of 140 to 860 kPa (20 to 125 psi).
3.2 Temperature
Devices shall be designed to function at a temperature range of 5 to 49 °C (40 to 120 °F).3.3 Bowl refill tube
3.3.1 Installed position
The bowl refill tube, when supplied, shall be sufficiently rigid to maintain its installed position.3.3.2 Retrofit devices only
The means of securing the bowl refill tube shall not obstruct a cross-sectional area of the tank overflowtube by more than 20 mm2(0.031 in2).
Note: When a water closet tank is equipped with an anti-siphon fill valve as original equipment, the requiredoverflow performance is determined in accordance with ASME A112.19.2/CSA B45.1.
3.4 Backflow prevention
The device shall be equipped with a means to prevent backflow. Air inlet ports shall be protected toreduce the risk of the intake of foreign material into the device.
3.5 Dimensional criteria for fill valve components — End connections3.5.1
Except when proprietary (i.e., non-standard) shanks or inlets are provided by the manufacturer, thedimensions of standard shanks or inlets designed to mate with standard coupling nuts or locknuts shallbe as specified in Figure 1.
3.5.2
Standard shank or inlet thread dimensions shall be 15/16-14 UNS-1A as specified in ASME B1.1.Standard coupling nut or locknut thread dimensions shall be 15/16-14 UNS-1B as specified inASME B1.1.
Note: The recommended standard major and pitch thread diameters are the following:a)Nominal shank thread 一
imajor diameter: 23.37 to 23.77 mm (0.9204 to 0.9359 in); andi)pitch diameter: 22.39 to 22.50 mm (0.8816 to 0.8895 in).
b)Nominal locknut and coupling nut thread –
i)minor diameter: 21.85 to 22.05 mm (0.8602 to 0.8681 in); andipitch diameter: 22.63 to 22.90 mm (0.8911 to 0.9014 in).