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1. Minimum waste concrete pump valve comprising a hermetic valve container structure (10) flooded with water, equipped with a cover (11) screwed to the structure and having a nozzle (111) and vent points (112), on the rear face it has a discharge tube (12) and on the front side pump tubes (13) and (13A), said structure (10) which is provided in the inner portion with an inlet conduit (20) interconnected to a discharge conduit (30), each conduit being provided with wear plates (21) and (31); the inlet conduit (20) is provided with a front plate (22) with projections (221) at its ends and by two openings (23) at the ends connected to each other through a tube (24), said front plate (22) having an opening (25) provided with a projection (251) allowing the connection of the discharge conduit (30); the discharge conduit (30) has a tapered body provided in its front portion with an opening (32) of circular shape and in the rear portion with an opening (33) of oblong shape, said opening (32) fitting together with the projection (251) of the opening (25); the conduit (20) has cylindrical nozzles (26), arranged on both sides, which telescopically connect to the nozzles (34) of the conduit (30) through a spring (261) which holds the wear plates (21) and (31) pressed against the walls of the structure (10); the valve structure (10) has in its front portion protrusions (101) arranged in the upper and lower portions of arrangement and housing of the switch cylinders (40) which are fixed and positioned in the internal portion of the structure (10) through attachment points (102) for connection with the hydraulic flow, said double action with double through-rod switch cylinders (40), are provided with rods (41) connected at its ends with the projections (221) and sleeve (42) provided with projections (421) fixed along with points (102) of the structure (10) and connected to the hydraulic flow to promote the linear movement of the rods (41) and the conduits (20) and (30).
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