Main specifications
Material
Polypropylene based (PP) technopolymer.
- Cover: red colour (TVD-EPDM), green (TVD-FKM).
Graphic symbol "valve" tampoprinted in black colour.
- Avoid contact with solvents, alcohol or detergents containing alcohol to preserve tampoprinted graphic symbol.
Threaded connector: black colour.
Standard executions
- TVD-FKM: flat packing ring and FKM membrane gasket, hardness 70 Shore A.
- TVD-EPDM: flat packing ring and EPDM membrane gasket, hardness 70 Shore A.
Maximum continuous working temperature
50°C.
General information
Features and applications
TVD. breather caps with vacuum breaker valve are suitable for reservoirs and tanks for liquid transport.
The membrane retaining system allows a quick emptying out of the reservoir by letting in big quantities of air through the cap. Thus avoiding the vacuum inside the reservoir, slowing down the liquid exit.
The pre-set pressure of the membrane gasket stops any liquid loss when the reservoir is shaken (for example during transportation).
The liquid pressure on the gasket guarantees a perfect seal of the cap, for example in case of overturning of the reservoir.
Resistance to chemical agents
Tests carried out under standard laboratory conditions at 23°C. Values to be considered only as guidelines.
Please contact ELESA Technical Department for further chemical resistance details to particular liquids not reported in the table.
| DEPRESSION | FLOW RATE |
| FKM | EPDM |
| 50 mb | 360 l/min | 370 l/min |
| 40 mb | 320 l/min | 330 l/min |
| 30 mb | 260 l/min | 280 l/min |
| 20 mb | 210 l/min | 230 l/min |
| 10 mb | 140 l/min | 160 l/min |
| 5 mb | 110 l/min | 130 l/min |
