AUXILIARY TAP VALVE

摘要

PCT No. PCT/AU94/00341 Sec. 371 Date Dec. 28, 1995 Sec. 102(e) Date Dec. 28, 1995 PCT Filed Jun. 23, 1994 PCT Pub. No. WO95/00789 PCT Pub. Date Jan. 5, 1995An auxiliary tap valve insertable into a fluid flow path of a tap is disclosed. The auxiliary tap valve includes a sleeve body with an auxiliary valve seat member, and an auxiliary valve member. The sleeve body has at least one constriction for restricting fluid flow through the auxiliary tap valve. The auxiliary valve member is supported within said sleeve body and operatively connectable to a main valve member of the tap to be movable between open and closed positions to open and close the auxiliary tap valve to fluid flow. The auxiliary valve member has a substantially-flat chamfered first face and a conical second face respectively facing downstream and upstream relative to fluid flow through the tap. In operation, fluid flow through said constriction is restricted to create a venturi pressure drop downstream across said auxiliary valve member. The venturi pressure and lift created by fluid flow against differential surface areas of the first and second faces collectively urge the auxiliary valve member toward the auxiliary valve seat member during fluid flow through the auxiliary valve member to reduce turbulence clatter.