PRODUCT STANDARDS
ASSE International product performance standards, developed through industry consensus, detail how a product is intended to function under normal operating conditions and include testing procedures and requirements for performance, health and safety.
Deep knowledge and constant improvement of over 50 product performance standards for plumbing components – most notably backflow preventers and temperature actuated mixing valves – puts ASSE in a class of its own. ASSE standards are developed and revised under the American National Standards Institute (ANSI) accredited standards development process.
ASSE PRODUCT PERFORMANCE STANDARDS
See below for a full listing of ASSE's product performance standards and their scopes.
ASSE 1001-2021 applies to atmospheric type vacuum breakers (herein referred to as the "device") that are single pipe-applied, flushometer-applied, or integrally-applied (does not apply to water closet tank ballcocks or similar devices that depend on float-operated valves to control flow). The purpose of these devices is to provide protection of the potable water supply against pollutants or contaminants that enter the system due to backsiphonage through the outlet. Under backsiphonage conditions, a small amount of water is permitted to exit through the air ports.
This standard covers minimum performance requirements for anti-siphon fill valves intended to be installed in water closet tanks.
ASSE 1003-23/CSA B356:23 applies to water pressure reducing valves for potable water distribution systems. The purpose of these valves is to reduce static and flowing pressures in water distribution systems. This is the first edition of ASSE 1003/CSA B356, Water pressure reducing valves for potable water distribution systems. It supersedes ASSE 1003, Performance Requirements for Water Pressure Reducing Valves for Potable Water Distribution Systems, published in 2020, and CSA B356, Water pressure reducing valves for potable water distribution systems, published in 2022.
ASSE/ANSI 1004-2024 applies to the backflow prevention device used on the potable water supply connected to a commercial dishwashing machine. The backflow prevention device shall be one of the following in compliance with Section 1.2.2:
a) An air gap
b) An air gap fitting
c) An atmospheric type vacuum breaker
d) A hose connection vacuum breaker
e) A pressure vacuum breaker
f) A hose connection backflow preventer or
g) A spill‐resistant vacuum breaker
This standard applies to residential use (household) type dishwashers, both front and top loading, requiring connection to the potable water supply and discharging into the plumbing drainage system.
This standard applies to household type automatic and semiautomatic clothes washers, combination washer-dryers and dryers including coin-operated household types, requiring connection to the potable water supply & discharging into the building plumbing drainage system.
This standard applies to the plumbing aspects of residential food waste disposers intended primarily for installation in the residential kitchen sink outlet. When supplied with water from the sink supply faucet, these devices discharge into the sanitary drainage system. These devices shall be designed to reduce food waste particle sizes for discharging into the sanitary drainage system. Devices shall include a means of self-cleaning and means to protect against mechanical shock. When a dishwasher discharge connection(s) is incorporated in the device, the device shall be designed so that if the discharge connection becomes blocked, backflow into the dishwasher shall not occur.
This standard applies to food waste grinders designed and intended for use in food establishments, supplied with water and which discharges waste into a plumbing drainage system.
Water hammer arresters are installed on water distribution system piping to prevent detrimental surge pressures within water distribution systems, thereby prolonging the service life of valves, piping, fittings, trim, equipment, appliances, appurtenances, and other devices which are part of the distribution system; and to eliminate noise. This standard applies only to those devices classified as water hammer arresters having a permanently sealed cushion of gas isolated from the water way, and designed to provide continuous protection, without maintenance, against detrimental surge pressures within the water distribution system.
Hose Connection Vacuum Breakers provide protection of the potable water supply against pollutants or contaminants that can enter the system through backpressure equal to the force created by an elevated hose from 6.0 inches (15.2 cm) to 10.0 feet (3.0 meters) in height and backsiphonage through the hose threaded outlets. This standard applies only to those devices designed to be installed on the discharge side of the hose bibb, hydrant, or faucet which is fitted with hose threads.
Backflow preventers with intermediate atmospheric vent (herein referred to as the “device”) are installed in the plumbing system to prevent backflow into potable water supply lines when pressure is temporarily higher in the polluted part of the system than in the potable water piping. Devices covered by ASSE 1012-2021 have functional capabilities for preventing both backsiphonage and backpressure, and can operate under continuous or intermittent pressure conditions. These devices have two independently operating check valves separated by an intermediate chamber with a means for automatically venting it to the atmosphere and can be installed in the horizontal, vertical up, or vertical down orientations. The check valves are force loaded to a normally closed position and the venting means is force loaded to a normally open position.
The purpose of Reduced Pressure Principle Backflow Prevention Assemblies (RP) is to keep contaminated water from flowing back into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the contaminated part of the system than in the potable water supply piping. These assemblies consist of 2 independently acting check valves, internally force loaded to a normally closed position and separated by an intermediate chamber (or zone) in which there is a hydraulically operated relief means for venting to the atmosphere, internally force loaded to a normally open position. These assemblies are designed to operate under continuous pressure conditions.
ASSE 1014 devices provide backflow protection against backsiphonage and backpressure in handheld showers, sometimes identified as “telephone showers.” These products are separately attached or are integral with handheld showers, tub fillers, flexible hoses, or components that are attached to a shower system, and include two independently acting check valves in series, or a check valve in series with a vacuum breaker feature.
The purpose of Double Check Backflow Prevention Assemblies (DC) is to keep polluted water from flowing into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the polluted part of the system than in the potable water supply piping. These assemblies consist of 2 independently acting check valves, internally force loaded to a normally closed position, 2 properly located tightly closing shut-off valves per Section 1.3.2.6 and properly located test cocks per Section 1.3.2.4. These assemblies are designed and constructed to operate under intermittent or continuous pressure conditions.
This standard applies to automatic compensating valves intended to be installed at the point of use, where the user has access to flow or final temperature controls, and where no further mixing occurs downstream of the device. This standard covers automatic compensating valves intended to control the water temperature to wall or ceiling mounted hand-held showers; shower heads; body sprays either in individual shower or tub/shower combination fittings; and tub spouts when part of tub/shower combination fittings.
Temperature Actuated Mixing Valves for Hot Water Distribution Systems are used for controlling water temperatures in hot water systems and shall be installed at the hot water source. They are not intended for point‐of‐use temperature limiting, control or end use applications including emergency eyewash and shower equipment. These devices consist of a hot water inlet connection, a cold water inlet connection, a mixed water outlet connection, a thermal element or thermostatic sensor and a means for adjusting the mixed water outlet temperature. These devices can be either mechanically actuated or electronically controlled device.
Devices covered by this standard are designed primarily to supply water to drain traps that have infrequent use and in which water evaporation would allow sewer gas to enter the premises. These devices are designed to supply potable water to a drain trap to maintain the water seal. A means for the prevention of backsiphonage shall be incorporated as part of the device.
The purpose of Wall Hydrants with Backflow Protection and Freeze Resistance is to provide protection of the water supply from contamination due to backsiphonage or backpressure and to protect the hydrant from damage due to freezing. These devices shall have a permanent means to protect against backflow due to either backsiphonage or backpressure. The backflow protection shall include a minimum of 2 mechanisms: an air inlet for preventing backsiphonage and a check valve for preventing backpressure. These devices are terminal fittings that supply water to hose connections without danger of freezing.
ASSE 1020 devices are installed in water supply lines to prevent the entrance of non-potable material into the potable water supply by backsiphonage (only) and are intended for use in both high and low hazard applications. This standard was first published in 1974 to extend ASSE's portfolio of standards for backpressure and backsiphonage backflow prevention devices for pipe applied vacuum breakers.
This standard covers devices for installation in the drain line of residential dishwashers, to prevent the backflow of contaminated liquid and entrained material into the dishwasher.
Backflow preventers for beverage dispensing equipment are engineered for installation in carbonated post-mix dispensing systems. ASSE 1022 covers a backflow prevention device designed to protect the potable water supply serving beverage dispensing equipment. These devices are intended for use under continuous or intermittent pressure conditions. These devices shall consist of two independently acting check valves biased to a normally closed position. An atmospheric port shall be located between the check valves and shall be biased to a normally open position. The port shall vent liquids, gases, or both, under backflow conditions.
Water dispensers covered by this standard include an integral electrically powered heater or cooler. Example products that are covered by this standard include but are not limited to under-counter-mounted water dispensing systems, free-standing plumbed systems, free-standing bottled systems, and counter-top systems. These products are for both residential and commercial use. Device shall consist of an accumulator vented to atmosphere when a heater is included, a thermal element or cooler, connection to an electrical outlet, and a dispensing fitting.
This standard applies to devices classified as dual check backflow preventers. The purpose of this device is to keep polluted water from flowing back into the potable water system when pressure is temporarily higher in the polluted part of the system than in the potable water piping. The devices covered by this standard are intended to protect the potable water supply from low hazard pollution at residential service lines and individual outlets. These devices are intended for continuous or intermittent pressure conditions with cold water service. Usage with hot water is limited to the temperature specified by the manufacturer. This device consists of 2 independently acting check valves, internally force loaded to a normally closed position, designed, and constructed to operate under intermittent or continuous pressure conditions.
A positive air pressure reduction device for sanitary drainage systems is a device specifically designed to protect water trap seals against unwanted positive pressure transients in sanitary drainage systems. Positive pressure reduction devices are to be used in building drainage waste and vent (DWV) systems. They are intended to reduce the impact of short duration air pressure transients that arise in DWV networks through use. They are not intended to have any effect on long duration or steady-state offsets in air pressure.
Dual check valve type backflow preventers (for carbonated beverage dispensers, post mix type, and non‐carbonated beverage dispensers) prevent carbon dioxide gas and carbonated water from backflowing into the potable water system which supplies the carbonating unit. These devices operate under continuous or intermittent pressure conditions. These devices consist of 2 independently acting check valves internally force loaded to a normally closed position and designed to operate under intermittent or continuous pressure conditions.
Laboratory Faucet Backflow Preventers are designed to protect the potable water supply from pollutants or contaminants which enter the system by backflow due to backsiphonage or backpressure when faucets are connected via hose connection to various laboratory devices. This standard applies only to those devices classified as backflow preventers that are designed for installation on laboratory faucets on the discharge side of the last shut-off valve. These devices are not for use under constant pressure conditions. These devices consist of two independently acting check valves, force loaded or biased to a normally closed position, and between the check valves a means for automatically venting to atmosphere, force loaded or biased to normally open position.
This standard covers pressurized flushing devices (PFDs) intended to flush water closets, urinals, and other plumbing fixtures and specifies requirements for materials, design, methods of operation, test methods, and markings.
Trap seal primers are primarily designed to supply water to floor drain traps that have infrequent use and in which water evaporation would allow sewer gas to enter the premises. The trap seal primers covered by this standard are designed to supply water to a drain trap to provide and maintain its water seal by using a supply from a fixture drain line, fill valve (ballcock), flushometer valve tailpiece or an electric trap seal primer. The rate of water flow to the trap shall be permitted to be fixed or adjustable.
The purpose of a Reduced Pressure Detector Backflow Prevention Assembly is to keep contaminated water from flowing back into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the contaminated part of the system than in the potable water supply piping. These assemblies are designed to detect low rates of flow up to 2.0 gpm (0.13 L/s) caused by leakage or unauthorized use.
This standard applies to the two types of assemblies identified as: a) Reduced Pressure Detector Assembly (RPDA); b) Reduced Pressure Detector Assembly Type II (RPDA-II). The RPDA and RPDA-II assemblies consist of 2 independently acting check valves, internally force loaded to a normally closed position, and separated by an intermediate chamber (or zone) in which there is a hydraulically operated relief means for venting to the atmosphere, internally force loaded to a normally open position. These assemblies are designed to operate under continuous pressure conditions. The assembly shall include 2 properly located, tightly closing shut-off valves per Section 1.3.2.7; and properly located test cocks per Section 1.3.2.5. The assemblies also include a bypass line.
The purpose of a Double Check Detector Backflow Prevention Assemblies is to keep polluted water from flowing into a potable water distribution system when some abnormality in the system causes the pressure to be temporarily higher in the polluted part of the system than in the potable water supply piping. These assemblies are also designed to detect low rates of flow up to 2 gpm (0.13 L/s) caused by leakage or unauthorized use.
This standard applies to 2 types of assemblies identified as: a) Double Check Detector Assembly (DCDA); b) Double Check Detector Assembly Type II (DCDA-II). The DCDA and DCDA-II assemblies consist of 2 independently acting check valves, internally force loaded to a normally closed position. These assemblies are designed to operate under continuous pressure conditions. The assembly shall include 2 properly located, tightly closing shut-off valves per Section 1.3.2.6; and properly located test cocks per Section 1.3.2.4. The assemblies also include a bypass line which provides a visual or audible indication of system leakage or unauthorized use of
Individual and Branch Type Air Admittance Valves for Chemical Waste Systems (AAVCs) are devices used in chemical waste systems to prevent the siphonage of trap seals. These devices do not relieve back pressure; they only allow air to enter the system. These devices are designed to be used for individual fixtures or for a horizontal branch serving multiple fixtures. When the devices are installed in a building, there shall be at least one (1) open vent terminal to relieve positive pressure which extends to the atmosphere outside of the building serving the same building drain on which these devices are installed. These devices shall not be installed in an area with a constant air pressure differential greater than ± 0.3 inches (7.6 mm) water column.
Stack Air Admittance Valves (AAVs) for Sanitary Drainage Systems are devices used in plumbing drainage systems to prevent the siphonage of water trap seals. These devices do not relieve back pressure; they only allow air to enter the system. These devices are designed to be installed on stacks where branches on multiple floors are connected. When these devices are installed in a building, there shall be at least one (1) open vent terminal to relieve positive pressure which extends to the atmosphere outside of the building serving the building drain on which these devices are installed.
Individual and Branch Type Air Admittance Valves (AAVs) for Sanitary Drainage Systems are devices used in plumbing drainage systems to prevent the siphonage of water trap seals. These devices do not relieve back pressure; they only allow air to enter the system. These devices are designed to be used for individual fixtures or for a horizontal branch serving multiple fixtures. When these devices are installed in a building, there shall be at least one (1) open vent terminal to relieve positive pressure which extends to the atmosphere outside of the building serving the building drain on which these devices are installed.
This standard establishes design requirements, basic performance requirements and test procedures for hose connection backflow preventers. This device is designed to be installed on the discharge side of a hose threaded outlet on a water system. This two‐check device protects against backflow, due to backsiphonage or low‐head backpressure, and is field testable to certify protection under the high hazard conditions present at a hose threaded outlet. This device shall only be used on systems where there is lowhead backpressure which does not exceed that generated by an elevated hose equal to or less than 10 feet (3.0 m) in height.
ASSE 1053 establishes design and performance requirements for Freeze Resistant Dual Check Backflow Preventer Wall Hydrants, which protect the potable water supply against backsiphonage and backpressure without damage to the device due to freezing. To verify protection under the high hazard conditions present at threaded hose outlets, these devices must be field-testable.
ASSE 1053 devices are classified as Type A or Type B. Type A devices automatically drain water when the hydrant valve is closed and the hose is removed to prevent damage from freezing, and Type B devices automatically drain water with a hose removed or attached, end nozzle closed, and the hydrant valve closed.
Chemical dispensing systems provide a means of mixing potable water with chemicals to provide the user with a chemical solution which is ready for use. The amount of dilution shall be fixed or adjustable. Devices covered by this standard are intended for stationary installations, mobile devices where the orientations are fixed, and hand-held devices. This standard applies to those devices classified as chemical dispensing systems and shall be protected by an air gap complying to ASME A112.1.3-2000 (R2015), an integral elastomer gap, or an Atmospheric Vacuum Breaker (AVB). If an AVB is used as its method of backflow protection, it must conform with ASSE 1001 or CSA B64.1.1.
This standard applies only to those assemblies classified as a spill-resistant vacuum breaker assemblies (SVB). These assemblies are designed for installation in water systems that are normally under continuous pressure conditions. Spill resistant vacuum breaker assemblies are installed in the water supply lines to prevent the backflow of non-potable material into the potable water supply caused by backsiphonage only.
The purpose of freeze resistant sanitary yard hydrants is to supply potable water without danger of damage to the device due to freezing, to provide protection of the potable water supply from contamination due to ground water, and to prevent backflow in accordance with the backflow prevention device selected. These devices shall only be used on systems where the low‐head backpressure does not exceed that generated by an elevated hose equal to or less than 10.0 ft (3.0 m) in height. This device shall not be subjected to continuous pressure. Continuous pressure shall mean 12 hours use in a 24 hour period.
ASSE 1060 provides performance standards and compliance testing procedures for devices that provide a range of protection for fluid conveying components that are mounted outside and above ground so that they may avoid damage from freezing, vandalism, and tampering. Fluid conveying components protected by these enclosures include backflow prevention assemblies and devices, water meters, control valves, pressure reducing valves, air release valves, pumps, and other components installed outdoors and above ground that require protection from freezing or require system security protection.
The purpose of this standard is to establish minimum performance requirements for push-fit fittings and push-fit connections that are integrated into plumbing devices. The fittings described in this standard are intended for use in hot and cold potable water distribution and hydronic heating systems in residential and commercial applications.
This standard applies to Temperature Actuated, Flow Reduction (TAFR) Valves for Individual Supply Fittings, which react to high-temperature water and are intended for use in-line with, or integrated into, individual plumbing supply fittings such as shower heads, bath and utility faucets, and sink and lavatory faucets. These valves automatically reduce discharge flow if water temperature exceeds a preset limit.
The purpose of air valve and vent inflow preventer assemblies is to allow the release and admission of high volumes of air through air valves and air vents in potable water distribution systems, but prevent the entry of contaminated water when the air valve outlet becomes submerged from flooding or is the target of malicious tampering. Assemblies consist of a primary and secondary chamber. Each chamber contains an independent float-operated closure member. The primary chamber is the lower chamber. The secondary or upper chamber is redundant and will close in the event that the primary chamber fails to close. Other configurations achieving the performance requirements of this standard are acceptable.
Portable backflow prevention assembly field test kits (BFTK) are used in testing the performance of backflow prevention assemblies. ASSE 1064 covers the performance requirements and accuracy of BFTKs. This standard is confined to analog dial type and digital instrumentation. Duplex gauges are not a part of this standard. BFTKs shall be of a design making them portable. Portable BFTKs shall be designed to indicate the operation of a backflow prevention assembly to pre-established testing procedures. The BFTK shall include all gauges, hoses, valves and fittings as required for testing purposes.
This standard applies to automatic pressure balancing in-line valves for individual fixture fittings that are used to equalize incoming hot and cold water line pressures for the purpose of minimizing mixed water temperature variations due to pressure fluctuations when used in conjunction with a mixing valve or two handle valve set. They are not designed to limit the maximum outlet temperature at the point-of-use. These devices are intended for use with individual plumbing fixture fittings used with showers, bathtubs, utility sinks, and shampoo sinks.
ASSE 1069 devices are intended to control the water temperature to individual or multiple fixtures to reduce the risk of scalding and thermal shock. They are intended to be installed where the bather has no access to the temperature adjustment means and where no further mixing occurs downstream of the device. This standard was developed for devices that service end use fixture fittings including, but not limited to, gang showers and sitz baths, by supplying tempered water at a preset temperature through a single supply pipe.
This standard covers water temperature limiting devices intended to limit the hot or tempered water temperature supplied to fittings for fixtures such as sinks, bidets, lavatories, and bathtubs to reduce the risk of scalding. These devices are not designed to address thermal shock.
These devices, including eyewash, eye/face wash, drench showers and combination units, are intended to be installed in systems that comply with ANSI Z358.1. These devices shall consist of a hot water inlet connection, a cold water inlet connection, a mixed water outlet connection, a temperature controlling element and a means for adjusting the mixed water outlet temperature while in service. The device shall also have a means to limit the maximum outlet temperature under normal operating conditions. Provisions shall be made so that the temperature cannot be inadvertently adjusted.
ASSE 1072-2020 establishes physical requirements, performance requirements, and test procedures for barrier type floor drain trap seal protection devices. These devices are designed to help protect the floor drain trap seal of floor drains that comply with ASME A112.6.3 by minimizing evaporation. The purpose of this device is to minimize the evaporation of the trap seal for the floor drain. The device will open to allow the flow of drainage and close when there is no flow. The device consists of a membrane that allows the flow of drainage to enter the plumbing drainage system. The device closes when there is no flow.
Dielectric Pipe Unions are used to join dissimilar pipe materials to prevent the flow of galvanic current or to isolate sections of pipe from stray currents which could cause accelerated corrosion and premature failure of plumbing components and associated piping. These devices are metallic and join metallic pipe in a similar manner to standard pipe unions and flanges, with the added ability to electrically insulate one pipe section from another.
ASSE 1081 provides performance standards and testing procedures for pressure reducing boiler feed valves that offer protection of the potable water supply by means of an integral backflow preventer with an intermediate atmospheric vent. Devices covered by this standard are installed in plumbing systems to fill and reduce static boiler pressure under normal conditions, as well as prevent backflow into potable water supply lines when pressures fluctuate.
ASSE 1082-2021 is for water heaters with defined setpoint controls under various steady state flow conditions. These water heaters control the outlet temperature to specific limits and are installed within a hot water distribution system, but not at point-of-use. The water heater shall consist of a heat exchanger, a cold water inlet connection, a hot water outlet connection, and a means for precisely governing the outlet temperature. The device controller shall be listed to the appropriate electrical safety standard in accordance with the device category.
Water heaters with precise output temperature control under varying flow conditions are used to provide tempered water to the user. As such, they need to limit maximum water temperature at the point of use in order to reduce and control the risks of scalding. ASSE 1084 is intended to provide a level of scald protection consistent with the current ASSE 1070 / ASME A112.1070 / CSA B125.70, Performance Requirements for Water Temperature Limiting Devices. These water heaters are not intended to limit thermal shock and are not substitutes for automatic compensative valves complying with ASSE 1016 / ASME A112.1016 / CSA B125.16, Performance Requirements for Automatic Compensating Valves for Individual Showers and Tub/Shower Combinations.
This standard covers water heaters with precise setpoint controls under varying flow conditions. ASSE 1085 is for water heaters supplying tepid water to emergency equipment, including eyewash, eye/face wash, emergency showers, and combination units. These water heaters heat the cold water supply to an acceptable tepid temperature within the intended range listed in ISEA Z358.1. The water heaters shall consist of a cold water inlet connection, a means of heating the water and controlling the discharge temperature, and an outlet connection to supply tepid water to the emergency equipment. The water heater shall also have a means to limit the maximum outlet temperature under normal operating conditions. Provisions shall be made so that the temperature setting of the water heater cannot be inadvertently adjusted.
Residential reverse osmosis (RO) water treatment systems provide an excellent means to reduce contaminants found in drinking water. To function properly, these systems need a certain amount of rinse water, which is typically sent to the drain. Manufacturers of RO systems and components have been working to improve the efficiency of RO systems by reducing the amount of rinse water needed. The purpose of this standard is to aid water conservation efforts by providing manufacturers an efficiency target for their RO system designs.
Plumbed water treatment units include any device or component, point-of-entry and point-of-use, that is used in a building to improve the quality of the water. This standard covers all water treatment products that are connected to the building’s potable water plumbing system. This standard is not intended to cover water treatment products used for process water or wastewater applications. Examples of water treatment equipment include deionizers, filters, softeners, reverse osmosis assemblies, ultraviolet systems, ozone systems, and distillers. This standard is not intended to cover residential water treatment devices.
ASSE 1090 was created to test point of use and commercial drinking water generating systems that are designed to create potable water from humidity. Critical components of these systems include a condenser, storage tank and disinfection control techniques to address microbiological water contamination. This standard is not intended to verify chemical, particulate or other water purity claims made by the manufacturer.
ASSE 1093-2019(R2023) / WSC PAS-97(2019)(R2023) covers three interrelated devices for creating connections to wells and aquifers: pitless units, pitless adapters, and well caps. The purpose of these devices is to allow for the flow and environmental protection of underground water into the cold water supply to a single or multiple premises. This standard was originally developed by the Water Systems Council (WSC) and was co-developed with ASSE International (ASSE) for the 2019 revision.
ASSE 1098 provides performance criteria for atmospheric vacuum breakers (AVB) installed on vacuum toilet assemblies and galley waste disposal units (GWDU) designed to be installed on passenger aircraft. Atmospheric type vacuum breakers shall be integral. The purpose of these devices is to provide protection of the potable water supply against pollutants or contaminants that enter the system due to backsiphonage through the outlet. Under backsiphonage conditions, a small amount of water is permitted to exit through the air‐ports.
Pressurized water storage tanks collect and store underground water under pressurized conditions to provide cold water supply to single or multiple premises. This standard prescribes minimum performance and construction requirements for pressurized storage tanks for service in water well systems with a maximum factory pre-charge pressure of 40 psig (276 kPa), or with exception as stated in DOT issued allowance to be operated in ambient air temperatures up to 120°F (49°C), with maximum working pressures not less than 75 psig (517 kPa) and not greater than 150 psig (1034 kPa) and tank volumes not exceeding 120 gallons (454L).
The purpose of a pilot operated water pressure reducing valve for potable water systems is to reduce static and flowing pressures in water systems. Devices covered by this standard are pilot operated, diaphragm types. Devices shall be permitted to have a strainer connected to the valve inlet or be without strainer.
The purpose of Proportional Flow Control Devices, with Protection from Cross Connection via Hydronic Water, for use in Potable Water Installations is to control the flow of potable water based on the pressure of hydronic water from a hydronic system. The devices perform this hydraulically and have integral cross‐connection protection between the potable and hydronic water. These devices are typically installed in conjunction with a heat exchanger and a part of a hydronic system loop. The device consists of a single potable cold water supply inlet and outlet, and a single hydronic supply inlet and outlet, a means of dynamic flow control, an atmospheric vent, and two sets of three dynamic seals between the potable and hydronic flow paths.