A dispenser for dispensing a liquid or viscous product, comprising a dispensing valve (2). The dispensing valve, in turn, comprises: —product sealing/releasing means (21), which in a first configuration prevents outflow of the product from the dispenser and in a second configuration enables outflow of the product from the dispenser; —elastic return means (22) for returning the sealing means (21) to the first configuration from the second configuration. The elastic return means (22) and at least part of the product sealing/releasing means (21) are integrated in the same body (20).