| 摘要 |
The anti-return device comprises a tubular inlet body (1), a tubular outlet body (2) and an elastic anti-return valve (3) which are coaxially arranged and mutually embraced, said bodies (1, 2) having coupling means to a washing liquid conduit. When inactivated, the valve (3) is resiliently closed; the impulse of washing liquid in the direction from the inlet body (1) to the outlet body (2) produces the resilient deformation of the valve (3) and its opening; when the washing liquid pulse stops, the elastic reaction of the valve (3) as well as the pressure of the washing liquid contained in the conduit or conduits upstream of the valve (3), close the value thereby impeding the emptying of the conduits by gravity. |
