A valve.

摘要

A valve for controlling the flow of water to a filter of a swimming pool has a tubular member (12) with a main inlet opening (14) at one end connectable to a suction hose, an outlet opening (16) at its other end connectable to a suction source, an auxiliary opening (18) intermediate its ends and a communication opening (20) also intermediate its ends. A sleeve (22) is located about the tubular member to be slidable therealong and is positioned on one side of the communication opening. A flexible bellows (28) is secured at one end to the sleeve and at its other to the tubular member on the other side of the communication opening to define a variable volume chamber in communication with the interior of the tubular member via the communication opening. A closure (36) is located in the auxiliary opening and is fast with the sleeve to be slidable therewith. A spring (34) urges the sleeve into a position in which the auxiliary opening is substantially closed.