BRV Bonetti Rubinetterie Valduggia S.r.l.
MODVLVS
Regolare e distribuire energia pulita
726 - Basic Series
Anti-scald thermostatic mixing valve for medium and small applications. Compact size. Available Kvs: 1.5, 1.8 and 3.4.
Product file
Mixing kit for ModvFresh Basic
35÷60°C thermostatic mixing kit designed for ModvFresh Basic, with anti-scald thermostatic mixing valve for small applications.
Product file
°Caleon Thermostat - Wi-Fi
Elegant chrono-thermostat with TFT capacitive touch panel. Wi-Fi N 2.4 Ghz connection for remote control by °Caleon app.
Product file
1610
Full bore 2-way zone ball valve, with bidirectional actuator with quick connection. Dimensions from 1/2" DN15 to 1"1/4 DN32.
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Logico
Multifunctional compact hydraulic module for the management of a direct circuit, a mixed circuit and the production of domestic hot water (DHW)
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DomvS Clima
Control unit for manifolds of heating and cooling radiant panels up to 200 m2. Fixed point thermostatic mixer or motorized rotary mixing valve. LCD room control unit.
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ModvBox
Modular multi-zone distribution box for wall-mounted gas boilers or heat pumps. Three types of available pump units: direct, mixed motorized, mixed fixed point.
Product file
Technical part
The rod seal by means of packing gland is the more used system in the standard ball valves. Two special gaskets made of PTFE, kept in compression by the packing gland, assure the seal and in the meantime the right handling of the adjustment rod. The guarantee of long life of the models of ball valves that have this seal system is due to the possibility to re-establish the right compression of the gaskets, if necessary (for instance owing to sudden thermic shocks), by simply operating on the packing gland.
The rod seal system by means of double O-ring made of EPDM Peroxide, tested for several years in the models of ball valves special for combustible gas , is used even in the ranges of models suitable for high pressure and temperature. Particularly all the ball valves used as components of pump units, of heating and solar systems, and the filter ball valves.
The head losses in a hydraulic system are represented, in addition to the pressure drop of the pipings, also by the pressure drops due to isolating equipments. Taking into consideration that the value of the head losses (Kvs) is proportional to the kinetic energy of the fluid and to experimental coefficients, its mathematical calculation is always very difficult. Kvs is le flow rate in m3/h, at the temperature of 15,5°C, that gives a pressure drop of 1 bar with the valve fully open.
Ph [bar] is pressure drop measured at valve's ends, at a set distance.
Diagram flow rate/headloss of Checkball valves series
In the following table you can find the Kvs valves of the different DN sizes of the standard and checkball ball valves series.
| DN |
8 | 10 | 15 | 20 | 25 | 32 | 40 | 50 | 63 | 74 | 94 |
| Kvs Standard ball valves |
6 | 9 | 18 | 39 | 71 | 119 | 196 | 300 | 525 | 870 | 1270 |
| Kvs Checkball | - | - | 2,7 | 4,5 | 7,6 | - | - | - | - | - | - |
TEST BENCH
(click to download PDF)
DIAGRAM PRESSURE/TEMPERATURE
Ball valves PN 40 series
Checkball valves series
The following table shows the maximum operation torques necessary to opening/closing workings for the different sizes of ball valves:
| DN |
10 | 15 | 20 | 25 | 32 | 40 | 50 | 63 | 74 | 94 |
| Mt [Nm] |
35 | 35 | 35 | 50 | 50 | 105 | 105 | 502 | 502 | 502 |
| Tw [Nm] |
1,5 | 2,5 | 3 | 5 | 7 | 5 | 12 | 15 | 17 | 20 |
| Ts [Nm] |
3 | 5 | 6 | 10 | 14 | 20 | 24 | 30 | 34 | 40 |
The values of the table have been got from a test session carried out on new valves (never used) with perfectly lubricated seals, at a temperature of 20°C and with a test pressure of 6 bar.
RELIABILITY/ENDURANCE TEST
The purpose of the test is the check of the hydraulic seal of a ball valve after a long series of cycles open/close. The valve under test is the art.510 ½” that is one of the most significant models of the range of standard ball valves, moreover several other models have the same engineering, only the outlets are different.
The test was carried out doing 10.000 cycles open/close on the test valve, mounted on the test installation, under the conditions of the following table:
| DN | Working torque Tw [Nm] |
Temperature [°C] | Pressure test [kPa (bar)] |
Flow rate [l/sec] |
||||||||
| 510 1/2" | 2,5 | 93°C | 400 (0,4) | 0,2 | ||||||||
After 10.000 cycles the valve was tested at the pressures of 16 and 0.2 bar, in order to check the inside and outside seal (gaskets seal). The test conditions and the results are carried in the following tables:
Test with closed valve
| Temp [°C] |
Tw [Nm] |
Test period [sec] |
Pressure test [kPa (bar)] |
Test result |
| 93 |
3,5 | 900 | 1st test: 1600 (16) / 2nd test: 20 (0,2) | Ok |
| 21 | 3,5 | 900 | 1st test: 1600 (16) / 2nd test: 20 (0,2) | Ok |
| Temp [°C] |
Test period [sec] |
Pressure test [kPa (bar)] |
Test result |
| 93 |
900 | 1st test: 1600 (16) / 2nd test: 20 (0,2) | Ok |
| 21 | 900 | 1st test: 1600 (16) / 2nd test: 20 (0,2) | Ok |
| DN |
10 | 15 | 20 | 25 | 32 | 40 | 50 | 63 | 74 | 94 |
| Corresponding Size |
1st size | 2nd size | 3rd size | 4th size | ||||||
| Closing torque [Nm] |
12 | 12 | 20 | 45 | ||||||