A pump dispenser comprising a pump mechanism , a dispensing nozzle and an outlet valve fitted to the dispensing nozzle , the outlet valve comprising: a first valve component constructed and arranged to be received by the dispensing nozzle ; and a second valve component constructed and arranged to cooperate with said first valve component , wherein said first valve component and said second valve component define a normally-closed flow interface, wherein (a) said first valve component comprises a post and the second valve component comprises a flexible panel defining a sleeved outlet opening , said normally-closed flow interface being by said post engaging said sleeved outlet opening , and said flexible panel being movable in response to a fluid force to open the normally-closed flow interface; and wherein (b) (i) said second valve component is openable from said first valve component for cleaning and said valve includes a projection to facilitate the opening of said second valve component for cleaning, and/or (ii) said second valve component is hinged to said first valve component , and/or (iii) said outlet valve is a single-piece component comprising the first and second valve components . a first valve component constructed and arranged to be received by the dispensing nozzle ; and a second valve component constructed and arranged to cooperate with said first valve component , wherein said first valve component and said second valve component define a normally-closed flow interface, wherein (a) said first valve component comprises a post and the second valve component comprises a flexible panel defining a sleeved outlet opening , said normally-closed flow interface being by said post engaging said sleeved outlet opening , and said flexible panel being movable in response to a fluid force to open the normally-closed flow interface; and wherein (b) (i) said second valve component is openable from said first valve component for cleaning and said valve includes a projection to facilitate the opening of said second valve component for cleaning, and/or (ii) said second valve component is hinged to said first valve component , and/or (iii) said outlet valve is a single-piece component comprising the first and second valve components . (a) said first valve component comprises a post and the second valve component comprises a flexible panel defining a sleeved outlet opening , said normally-closed flow interface being by said post engaging said sleeved outlet opening , and said flexible panel being movable in response to a fluid force to open the normally-closed flow interface; and wherein (b) (i) said second valve component is openable from said first valve component for cleaning and said valve includes a projection to facilitate the opening of said second valve component for cleaning, and/or (ii) said second valve component is hinged to said first valve component , and/or (iii) said outlet valve is a single-piece component comprising the first and second valve components . (i) said second valve component is openable from said first valve component for cleaning and said valve includes a projection to facilitate the opening of said second valve component for cleaning, and/or (ii) said second valve component is hinged to said first valve component , and/or (iii) said outlet valve is a single-piece component comprising the first and second valve components . <EOS>