The utility model belongs to the technical field of water isolation pumps, and particularly relates to a flow control valve of an
isolation tank slurry pump, which comprises an
isolation tank, a first valve body and a second valve body are respectively mounted between the
isolation tank and an upper seal head and between the isolation tank and a lower seal head, a floating ball is movably mounted on the inner side of the isolation tank, the first valve body comprises a
flange plate, and the inner wall of the
flange plate is connected with a connecting ring. The inner wall of the connecting ring is of a
conical surface structure, a sealing
assembly is installed in the middle of the floating ball and comprises a waistband, the upper side and the lower side of the waistband are oppositely connected with a lower sealing plate and an upper sealing plate which are the same in structure, the lower sealing plate and the upper sealing plate are attached to the inner wall of the connecting ring in a matched mode, and a second sealing
gasket is bonded to the lower sealing plate and the upper sealing plate. The contact area of the second sealing
gasket and the first valve body and the contact area of the second sealing
gasket and the second valve body are increased through the conical contact faces, the buffering effect is improved, the conical faces can play a role in flow guiding, and the situation that gravel is accumulated on the contact faces of the second sealing gasket, and the sealing effect is affected is effectively avoided.