Mixer or pre=mixer tap with two inlet and one outlet ports controlled by taps and non=return valve

摘要

The mixer or pre-mixer tap (1) of the type which consists of an exit (2) and two entries (3) each one with a valve (4,4b) downstream of which is a non return valve (5). It contains an operating rod (6) provided at one end with an operating button (7) and at its other end with a valve (8) which cooperated with its associated seat (9) to open and close the corresponding inlet. This operating rod (6) contains an item to check the sealing of the non-return valve (5) which is directly adjacent. This is in the form of an air bleed which bleeds the air from between the non-return valve (5) and the valve (4) when the latter is closed so that the other valve (4B) can then be opened to verify the sealing of the non-return valve and vice versa.