nti-pollution check valves 0-0-0-0-0 series REITE ISO 0 FM LEFFI 000/ G replaces dp 000/0G Function The anti-pollution check valve is a protective plumbing device capable of preventing the backflow of polluted water into the mains water system. This may occur due to changes in pressure in the distribution network that cause water to flow backwards. The check valve, which is fitted between the mains and the user system in water distribution systems, prevents any contact between the water in the two systems, as it closes automatically whenever backflow conditions occur. The 0 and 0 series of anti-pollution check valves are certified as being compliant with the performance specifications set out in European standard EN 99. Product range 0 series ontrollable check valve, E type sizes /, /,, /, /, ode 00 ompact controllable check valve, E type size / 0 series ontrollable check valve, E type sizes /,, /, /, 0 series ngled controllable check valve, E type sizes /, 0 series Non-controllable check valve, E type sizes /, /, 0 series ontrollable double check valve sizes /, / ode 00 ontrollable ball valve with approved built-in check valve size / ode 0 ontrollable check valve, E type size / Technical specifications series 0-0 0-0-0 Materials ody: brass EN WN brass EN WN heck valve: POM POM Springs: stainless steel stainless steel O-Ring seals: EPM, NR EPM, NR Union seal: 0 series: non-asbestos fibre NR 0 series: non-asbestos fibre NR Knob: - 0 series: EN WN all: - 0 series: EN WN, chrome-plated all control stem: - 0 series: EN WN all seal seat: - 0 series: PTFE Test port cap: 0/0 series PG0; 0/0 series: PG0 code 00: brass EN WN Performance Medium: drinking water drinking water Maximum working pressure: 0 bar 0 bar Min. opening pressure for check valve: 0, kpa 0, kpa Maximum working temperature: onnections 0 series: / F (N 0) 0 series: / F (N ) (internal check valve N) code 00: / F with union for M (N ) 0 series: /, / F (N, ) 0 series: / F with union for M (N 0) 0 series: / F with union for M (N ) code 0: / F with captive nut for M (N ) code 0: F with captive nut for M (N ) code 0: / F with captive nut for M (N ) Test port connections / F; code 00: / F 0/0 series: / F
imensions ode 00 00 00 00 00 0 /" /" " /" /" " 0 0,,, 0 0 0, 0, 0,0 0,, 0 0 ode 00 00 00 00 00 /" " /" /" " 0,,, 0 0, 0, 0,0,0,0 0 ode 00 /" 0, 0 E 0,0 ode 00 00 00 /" /" " 0, 0, ode 00 00 /" /" 0, 0,,, * Internal check valve N o ode 00 /" 0,, 9 E F G 0, 0, ode 0 0 /" " 0, 0, /" " ode 0 /", E 0,
ackflow Potable water, flowing in the mains supply network, may suffer from hazardous pollution mainly caused by the return of contaminated medium from downstream systems directly connected to the main supply. This phenomenon, termed backflow, occurs when: a) the pressure in the mains system is lower than the pressure in the downstream hydraulic circuit (back siphonage). This situation may occur when there is a pipe breaking in the mains system or when demand on the mains supply network by consumers is very heavy. b) the pressure in the downstream circuit rises (counter pressure/downstream overpressure) due, for example, to the inlet of water pumped from a well. ack siphonage Use of type E - E anti-pollution check valves European reference standards EN and EN 99 The use of E and E type anti-pollution check valve is regulated by the new European standards relating to the prevention of pollution caused by backflow. The reference standard is EN : 00 Protection against pollution of potable water in water installations and general requirements of devices to prevent pollution by backflow. This standard classifies the water in the systems according to the level of risk it represents for human health. ategory : Water to be used for human consumption coming directly from a potable water distribution system. ategory : Fluid presenting no human health hazard, as per, the quality of which can have undergone a change in taste, odour, colour or temperature. ategory : Fluid representing some human health hazard due to the presence of one or more harmful substances. ategory : Fluid presenting a human health hazard due to the presence of one or more toxic or very toxic substances or one or more radioactive, mutagenic or carcinogenic substances. ownstream overpressure * positive action Risk assessment Given the potential danger of the phenomenon and the requirements of current regulations, the risk of pollution by backflow must be assessed on the basis of the type of system and the characteristic of the medium that flows in it. n appropriate backflow prevention device must be selected on the basis of that assessment performed by the system designer and the mains supply ompany. The device must be located along the supply line at those points at risk of backflow which would be hazardous to human health. ategory : Fluid presenting a human health hazard due to the presence of microbiological or viral elements. ccording to this classification, suitable backflow prevention devices must be fitted in water distribution circuits. E and E type anti-pollution check valves can be used to offer protection against the risk of water contamination up to category. For category water, it is necessary to use a type backflow preventer. The table below, called the Protection matrix, associates the various types of system with the related fluid categories, and was created based on the indications provided in European standard EN and in Local Regulations. The table is not comprehensive, and checks should conducted at the time of application to ensure compliance with any local standards or regulations. The European standard EN 99 nti-pollution check valves from N to N 0. Family E, type,, and. defines the functional, dimensional and mechanical requirements of anti-pollution check valves. Protection matrix System type at. medium General Hot and cold water mixing devices in domestic water systems * Water cooling devices for air conditioning units, without additives * Filling of heating systems, without additives * omestic water softeners regenerated with common salt * ommercial water softeners (only regenerated with common salt) * Water in sinks, baths and showers * omestic dishwashers and washing machines * omestic, residential or commercial gardens Hand-held fertiliser sprayers for use in domestic gardens * atering utomatic dispensers without injection of ingredients or O * Ice-making machines * Large kitchen machines with automatic filling systems * Medical omestic dialysis machines *
LEFFI F N Operating principle The anti-pollution check valve consists of a valve body (), a check valve () and, if necessary, one or more inspection points () for operation checking and system draining procedures. The check valve () separates two different zones: one upstream or at the inlet (), and one downstream or at the outlet (). orrect flow conditions In correct flow conditions, the check valve () opens automatically when the pressure in the flow direction upstream () is greater than the downstream value (). onstruction details Hydraulic seal devices When the flow stops, the check valve rests on a lip-shaped EPM seal () which guarantees watertightness, even in the absence of counter pressure. In the event of strong back pressure, the obturator () alters the shape of the seal and rests on the actual end point. This solution guarantees optimal device durability. UPSTREM NORML OPERTION OWNSTREM No flow conditions The check valve () closes in advance under the action of the force exerted by the spring when the pressure downstream () begins to equal the value upstream (), after the flow has stopped. Elastomers complying with food regulations The elastomers used for the hydraulic seals have been approved by the ertifying uthorities in accordance with the most recent provisions regarding compatibility for use with drinking water. Versions with adjustable nut These versions are designed specifically for installation downstream of the water meter. The adjustable nut should be mounted directly over the body of the meter. UPSTREM NO FLOW ONITION OWNSTREM ouble check valve, 0 series The range of products also includes the double check version () and (), with inspection point (). Upstream pressure loss The check valve () remains closed, preventing water which has already been sent to the user from flowing back towards the mains water system. UPSTREM OWNSTREM UPSTREM PRESSURE LOSS ownstream pressure increase If the pressure in the downstream zone () increases until it exceeds the upstream pressure value (), the check valve () remains closed, thus preventing water that has already been sent to the user from flowing back towards the public network. The double check valve may be used, where permitted by current local legislation, as an alternative to the backflow preventer, whenever the water distribution mains has low inlet pressure. The sealing-tightness of the check valve, furthermore, can be tested using the pressure test port in the valve body. ertification The anti-pollution check valves in the 0 and 0 series have been certified as compliant with specific national and European product standards laid down by the following bodies: NF - ELGQU - S. The 0, 0 and 0 series are S-certified.
N F N F LEFFI Hydraulic characteristics p (m w.g.) 0 9,,,,,,, 0,9 0. 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, Series* NF LEFFI LEFFI LEFFI LEFFI 0, 0, 0, 0, 0, 0,9 LEFFI N,,,,, N 0,, 9 0 N N 0 N N 0 0 0 N 0 0 0 0 0 p (kpa) 00 0 0 0 0 0 0 0 9,,, 00 G (m /h) p (m w.g.) 0 9,,,,,,, 0,9 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, NF LEFFI 0, 0, 0, 0, 0, 0, 0, 0, 0,9,,,,, N,, N 9 p (kpa) 00 0 0 0 0 0 0 0 9,,, 0 Series** 0 00 00 Internal check valve N Kv (m /h),0,0 ** double check valve G (m /h) Internal check valve N Kv (m /h) * single check valve Installation and operation checking procedure E E TYPE Installation efore installation, make sure that the device is suitable for protecting the supply system, in relation to the type of fluid used in the system. The controllable check valve should be installed in an accessible position downstream of a shut-off valve. efore installing the backflow preventer flush the pipe with a high capacity WTER MINS Upstream shut-off valve SYSTEM flow rate: the lack of cleaning can easily result in impaired operation of the product. Inspection and maintenance (operation check) procedures should be carried out at least once a year, in accordance with EN 0-. Inspection heck whether the installation standards still require the application of the same device for the type of fluid used in the system. Make sure that the hazard level of the fluid inside the system has not altered over time. heck that the surrounding environment is clean, the valve is accessible and that there are no leaks, corrosion or deterioration. Maintenance (operation check) To test the seal of the check valve, check that the valve closes each time the pressure in the upstream water supply so as to prevent water from the installation flowing back into the supply system: a) to maintain pressure in the installation in the absence of flow, close all shut-off valves or users downstream of the valve. Using the downstream test port (), check that the pressure is greater than 0, bar. b) close the shut-off valve upstream () and open the test port () of the check valve. The flow should stop once the upstream section of pipe has emptied; c) if not, check the sealing-tightness of the upstream shut-off valve (): if this valve is sealing correctly but the flow from the test port () continues, replace the check valve, as the flow can only be caused by imperfect sealing of the valve; d) test port () (if present) can be used with a pressure gauge to test system pressure downstream of the check valve. NF LEFFI ontrollable check valve - Pressure test ports E TYPE Installation The E check valve installation procedure is the same as that for the E valve. Inspection and maintenance (operation check) Inspection and operation check procedures should be carried out at least once a year, in accordance with EN 0-. Inspection The E check valve inspection procedure is the same as that for the E valve. Maintenance (operation check) Replace the valve every 0 years.
SPEIFITION SUMMRY 0 series ontrollable check valve. E type. / threaded connections (from / to ) F, internal check valve N (from N to N 0). ertification to EN 99. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in PG0, / F connections. ode 00 ontrollable check valve. E type. Threaded / F union connections for M, internal check valve N. ertification to standard EN 99. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Non-asbestos fibre NR union seal. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in brass, / F connections. 0 series ontrollable check valve. E type. Threaded / F union connections for M (from / to ) F, internal check valve N (from N to N 0). ertification to EN 99. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Non-asbestos fibre NR union seal. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in PG0, / F connections. ode 0-0 ontrollable check valve with angled connections. E type. / (and ) F threaded connections with captive nut for M, internal check valve N (and N ). ertification to EN 99. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Non-asbestos fibre NR union seal. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in PG0, / F connections. ode 0 ontrollable check valve. E type. / F threaded connections with captive nut for M, internal check valve N. ertification to standard EN 99. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Non-asbestos fibre NR union seal. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in PG0, / F connections. 0 series Non-controllable check valve. E type. / threaded connections (from / to ) F, internal check valve N (from N to N ). rass body. POM check valve. Stainless steel spring. EPM O-Ring seals. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. 0 series ontrollable double check valve. / (and / ) F threaded connections, internal check valve N (and N ). rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port cap in PG0, / F connection. ode 00 ontrollable ball valve with approved built-in check valve. Threaded / F union connections for M, internal check valve N. rass body. POM check valve. Stainless steel spring. EPM and NR O-Ring seals. Non-asbestos fibre NR union seal. rass knob. rass ball, chrome plated. rass ball control stem. PTFE ball seal seat. Medium drinking water. Maximum working pressure 0 bar. Minimum opening pressure for check valve 0, kpa. Maximum working temperature. Test port caps in PG0, / F connections. We reserve the right to make changes and improvements to the products and related data in this publication, at any time and without prior notice. aleffi S.p.. S.R. 9 no. 00 Fontaneto d gogna (Novara) Italy Tel. +9 0 9 Fax +9 0 info@caleffi.com www.caleffi.com opyright aleffi