3/4"MF Archivi - Unival https://univalsrl.it/en/misure/3-4mf-en/ Unique Value for You Tue, 15 Feb 2022 16:01:54 +0000 en-US hourly 1 https://univalsrl.it/wp-content/uploads/2021/08/cropped-Fav-icon-32x32.png 3/4"MF Archivi - Unival https://univalsrl.it/en/misure/3-4mf-en/ 32 32 Diaphragm safety valve for boilers less to 30.000 kcal/h https://univalsrl.it/en/product/diaphragm-safety-valve-for-boilers-less-to-30-000-kcal-h-3/ Tue, 07 Sep 2021 10:50:05 +0000 http://univalsrl.it/prodotto/diaphragm-safety-valve-for-boilers-less-to-30-000-kcal-h-3/ CE 2014/68/UE/P.E.D

L'articolo Diaphragm safety valve for boilers less to 30.000 kcal/h proviene da Unival.

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Specifiche tecniche

A 47
B 75
M1 1/4"
CH 31
CALIB. 1,5÷8 bar
PZ. 8/72
kg 15
ART 200
DN 3/4" MF

Safety valves for heating and plumbing systems

Overview and function

Safety valves are typically used for controlling the pressure in heat generators (heaters, solar panels, boilers) in heating systems, plumbing systems and water systems. When the set pressure is reached, the valve opens and vents, impeding the system from reaching dangerous limits for the generator and for the compo- nents in the system itself.

Ordinary safety valves used on generators rated below 35 kW (30.000Kcal/H).

Technical characteristics

  • Diaphragm safety valve
  • Body: OT58 UNI EN 12165 CW617N
  • Top: Nylon caricato vetro 30%
  • Diaphragm: EPDM
  • Spring: Acciaio UNI 3823
  • Control knob: ABS
  • Nominal pressure: PN10
  • Temperature range 5÷120°C
  • Valve calibration: 2,5÷8 bar
  • DN 1/2″ seat diameter: Ø 13mm
  • DN 3/4″ seat diameter: Ø 13 mm
  • Manual opening by red knob
  • Gauge coupling: 1/4 Gas_F

Installation

Before safety valves are installed, they must be correctly sized by a specialised technician, according to the standards in force and for the specific applications. They must not be used for purposes other than the one they are designed for. Only qualified technical personnel may install safety valves according to the standards in force. Safety valves must be installed respecting the flow direction indicated on the valve body.

Certification

CE mark TP: double function relief valves comply with the essential safety requirements of Directive 97/23/EC concerning pressure equipment (also called PED). They are therefore classified as category IV and are equipped with the CE mark.

Product certification in accordance with European Standard EN 1490

The European standard EN 1490: 2000, entitled “Valves for buildings”

  1. Combined temperature and pressure relief valves
  2. Tests and requirements, describes the constructional and performance specifications that TP relief valves must have.

NB:

  • Valve calibration from 2.5 to 8 bar, on request.

  • Possibility of creating alternative versions to drawings on specific customer request.

L'articolo Diaphragm safety valve for boilers less to 30.000 kcal/h proviene da Unival.

]]> Safety valve for water heaters with handle https://univalsrl.it/en/product/safety-valve-for-water-heaters-with-handle-4/ Fri, 03 Sep 2021 13:29:10 +0000 http://univalsrl.it/safety-valve-for-water-heaters-with-handle-4/ Technical specifications A 46 B 65 CH 25 Ø C 8 DN 1/2″ MF, 3/4″ MF PZ. 15/135, 10/90 kg 15, 10 CALIB. 8,5 bar ART 122, 123 Heavy model ___________________________ Function The pressure relief valves protect hot water storage heaters from internal overpressure. Furthermore, they restrict or prevent (according to requirements) water returning to […]

L'articolo Safety valve for water heaters with handle proviene da Unival.

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Technical specifications

A 46
B 65
CH 25
Ø C 8
DN 1/2" MF, 3/4" MF
PZ. 15/135, 10/90
kg 15, 10
CALIB. 8,5 bar
ART 122, 123

Heavy model

___________________________

Function

The pressure relief valves protect hot water storage heaters from internal overpressure. Furthermore, they restrict or prevent (according to requirements) water returning to main supply piping. Pressure relief valves essentially consist of 8 main devices: 3 controlling flow and 5 safety devices.

L'articolo Safety valve for water heaters with handle proviene da Unival.

]]> Horizontal safety group assembly for hot water storage heaters https://univalsrl.it/en/product/horizontal-safety-group-assembly-for-hot-water-storage-heaters-2/ Fri, 03 Sep 2021 09:14:53 +0000 http://univalsrl.it/horizontal-safety-group-assembly-for-hot-water-storage-heaters-2/ Technical specifications A 98 B 100 CH 30 DN 3/4″ M PZ 1/12 kg 6 CALIB. 7 bar Observation on European Normative UNI EN 1487 It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions from DN15 to DN40 and working […]

L'articolo Horizontal safety group assembly for hot water storage heaters proviene da Unival.

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Technical specifications

A 98
B 100
CH 30
DN 3/4" M
PZ 1/12
kg 6
CALIB. 7 bar

Observation on European Normative UNI EN 1487

It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions from DN15 to DN40 and working pressure from 1 bar (0,10 MPa) to 7 bar (0,70 MPa). Hydraulic safety groups are to be connect to water heaters and tanks through the fitting of cold-water inlet source, with a temperature of distribution of 110° for all energy sources. Furthermore, they control and limit a pressure inside water heaters and forbid, having this function, reflux of the hot water into water system and contamination of the water inside heaters by drain water.

Hydraulic safety groups are not controlling temperature, but can control hydraulic safety of water heaters if mechanic resistance of heater remain at least equal to nominal pressure capacity.

So, it can be state that operators simply have to request and install safety groups in accordance with European Normative UNI EN 1487 by disposition of Ministry of Industry n°829571 from 26th March 2003.

P.S. “Ball-valve” type.

Technical characteristics

  • Body: brass UNI EN 12165 CW617N chrome-plated
  • Plugs and caps: PA6
  • Diaphragm: EPDM 70SH
  • Springs: steel UNI 3823
  • Control knob: ABS
  • Check valve: CLASS A
  • Maximum working pressure: 10 bar (1 MPa)
  • Maximum working temperature: 120 °C
  • Safety relief valve pressure setting: 7 bar (0,7 MPa) ±0,1 bar (0,01 MPa)
  • Maximum output of the water heater: size 3/4” 10 kW
  • Discharge flow rate at 8,5 bar (+20% PS): with water: > 600 l/h. with steam: > 220 kg/h
  • Usable with ART. 145 exhaust and adjustable siphon for safety group assembly

Function

The safety group assembly “UNIVAL” can be installed on elettrical and gas water heaters which have a power till 10 Kw (3/4″ connection). More over this device protects water heater from internal over pressures, allowing the passage of water from the inlet source to the water heater when the pressure inside water heater diminish for 0,1 – 0,2 bar (0,01-0,02 MPa). It also prevent that water returns in the supply piping (antipollution). The safety unit is set by means of compression of a spring to a standard opening value of 7 bar (0.70 MPa). During testing the set rate is gauged on the second opening of the safety mechanism. During discharge the device becomes watertight again when the pressure decreased for 1 bar (0,01 MPa) comparing to the opening valve tollerance set rate ±1 bar (0,10 MPa).

L'articolo Horizontal safety group assembly for hot water storage heaters proviene da Unival.

]]> Vertical safety group assembly for hot water storage heaters https://univalsrl.it/en/product/vertical-safety-group-assembly-for-hot-water-storage-heaters-2/ Fri, 03 Sep 2021 09:10:51 +0000 http://univalsrl.it/vertical-safety-group-assembly-for-hot-water-storage-heaters-2/ Technical specifications A 108 B 55 C 94 CH 30 D 77 DN 3/4″ M DN1 1″M PZ 1/12 kg 7 CALIB. 7 bar Observation on European Normative UNI EN 1487 It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions […]

L'articolo Vertical safety group assembly for hot water storage heaters proviene da Unival.

]]>

Technical specifications

A 108
B 55
C 94
CH 30
D 77
DN 3/4" M
DN1 1"M
PZ 1/12
kg 7
CALIB. 7 bar

Observation on European Normative UNI EN 1487

It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions from DN15 to DN40 and working pressure from 1 bar (0,10 MPa) to 7 bar (0,70 MPa). Hydraulic safety groups are to be connect to water heaters and tanks through the fitting of cold-water inlet source, with a temperature of distribution of 110° for all energy sources. Furthermore, they control and limit a pressure inside water heaters and forbid, having this function, reflux of the hot water into water system and contamination of the water inside heaters by drain water.

Hydraulic safety groups are not controlling temperature, but can control hydraulic safety of water heaters if mechanic resistance of heater remain at least equal to nominal pressure capacity.

So, it can be state that operators simply have to request and install safety groups in accordance with European Normative UNI EN 1487 by disposition of Ministry of Industry n°829571 from 26th March 2003.

P.S. “Ball-valve” type.

Technical characteristics

  • Body: brass UNI EN 12165 CW617N chrome-plated
  • Plugs and caps: PA6
  • Diaphragm: EPDM 70SH
  • Springs: steel UNI 3823
  • Control knob: ABS
  • Check valve: CLASS A
  • Maximum working pressure: 10 bar (1 MPa)
  • Maximum working temperature: 120 °C
  • Safety relief valve pressure setting: 7 bar (0,7 MPa) ±0,1 bar (0,01 MPa)
  • Maximum output of the water heater: size 3/4” 10 kW
  • Discharge flow rate at 8,5 bar (+20% PS): with water: > 600 l/h. with steam: > 220 kg/h
  • Usable with ART. 145 exhaust and adjustable siphon for safety group assembly

Function

The safety group assembly “UNIVAL” can be installed on elettrical and gas water heaters which have a power till 10 Kw (3/4″ connection). More over this device protects water heater from internal over pressures, allowing the passage of water from the inlet source to the water heater when the pressure inside water heater diminish for 0,1 – 0,2 bar (0,01-0,02 MPa). It also prevent that water returns in the supply piping (antipollution). The safety unit is set by means of compression of a spring to a standard opening value of 7 bar (0.70 MPa). During testing the set rate is gauged on the second opening of the safety mechanism. During discharge the device becomes watertight again when the pressure decreased for 1 bar (0,01 MPa) comparing to the opening valve tollerance set rate ±1 bar (0,10 MPa).

L'articolo Vertical safety group assembly for hot water storage heaters proviene da Unival.

]]> Vertical safety group assembly for hot water storage heaters https://univalsrl.it/en/product/vertical-safety-group-assembly-for-hot-water-storage-heaters/ Fri, 03 Sep 2021 09:05:22 +0000 http://univalsrl.it/vertical-safety-group-assembly-for-hot-water-storage-heaters/ Safety valves are the last devices to protect pressure equipments and people working on them. For this reason safety valves have to be well manufactured, assembled and periodically checked.

Their design and construction are on our own responsibility, but the choice of their correct size and type depends on the decisions of the manufacturer of the equipment where the valve is fitted. Maintenance is on final user’s responsibility to whom we are giving, hereby, all necessary instructions and information.

L'articolo Vertical safety group assembly for hot water storage heaters proviene da Unival.

]]>

Technical specifications

A 84,5
B 100
CH 30
DN 3/4"
PZ. 1/12
kg 5
CALIB. 7 bar

Observation on European Normative UNI EN 1487

It is specified that normative UNI EN 1487 define sizes, materials and requested performances (including test methods) of hydraulic safety groups for nominal dimensions from DN15 to DN40 and working pressure from 1 bar (0,10 MPa) to 7 bar (0,70 MPa). Hydraulic safety groups are to be connect to water heaters and tanks through the fitting of cold-water inlet source, with a temperature of distribution of 110° for all energy sources. Furthermore, they control and limit a pressure inside water heaters and forbid, having this function, reflux of the hot water into water system and contamination of the water inside heaters by drain water.

Hydraulic safety groups are not controlling temperature, but can control hydraulic safety of water heaters if mechanic resistance of heater remain at least equal to nominal pressure capacity.
So, it can be state that operators simply have to request and install safety groups in accordance with European Normative UNI EN 1487 by disposition of Ministry of Industry n°829571 from 26th March 2003.

P.S. “Ball-valve” type.

Technical characteristics

  • Body: brass UNI EN 12165 CW617N chrome-plated
  • Plugs and caps: PA6
  • Diaphragm: EPDM 70SH
  • Springs: steel UNI 3823
  • Control knob: ABS
  • Check valve: CLASS A
  • Maximum working pressure: 10 bar (1 MPa)
  • Maximum working temperature: 120 °C
  • Safety relief valve pressure setting: 7 bar (0,7 MPa) ±0,1 bar (0,01 MPa)
  • Maximum output of the water heater: size 3/4” 10 kW
  • Discharge flow rate at 8,5 bar (+20% PS): with water: > 600 l/h. with steam: > 220 kg/h
  • Can be used with siphon art. 145 adjustable

Function

The safety group assembly “UNIVAL” can be installed on elettrical and gas water heaters which have a power till 10 Kw (3/4″ connection). More over this device protects water heater from internal over pressures, allowing the passage of water from the inlet source to the water heater when the pressure inside water heater diminish for 0,1 – 0,2 bar (0,01-0,02 MPa). It also prevent that water returns in the supply piping (antipollution). The safety unit is set by means of compression of a spring to a standard opening value of 7 bar (0.70 MPa). During testing the set rate is gauged on the second opening of the safety mechanism. During discharge the device becomes watertight again when the pressure decreased for 1 bar (0,01 MPa) comparing to the opening valve tollerance set rate ±1 bar (0,10 MPa).

L'articolo Vertical safety group assembly for hot water storage heaters proviene da Unival.

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