Circulating pump arrangements, more especially for central heating systems

Claim 1

A CIRCULATING PUMP COMPRISING A CASING DEFINING AN INTERIOR CHAMBER, FLUID-INLET CHANNEL MEANS INTERSECTING SAID CHAMBER, FLUID-OUTLET CHANNEL MEANS INTERSECTING SAID CHAMBER, FLUID CIRCULATING MEANS REMOVABLY MOUNTED IN SAID CHAMBER FOR FORCING FLUID FROM SAID FLUID-INLET CHANNEL MEANS TO SAID FLUID-OUTLET CHANNEL MEANS, VALVE MEANS LOCATED IN SAID CHAMBER INCLUDING A VALVE MEMBER AND BIASING MEANS FOR URGING SAID VALVE MEMBER INTO ENGAGEMENT WITH SAID CIRCULATING MEANS, SAID VALVE MEMBER BEING MOUNTED IN SAID CHAMBER FOR MOVEMENT BY SAID BIASING MEANS IN RESPONSE TO REMOVAL OF SAID CIRCULATING MEANS FROM A FIRST POSITION ALLOWING FLOW OF FLUID BETWEEN SAID CHANNEL MEANS AND SAID CHAMBER TO A SECOND POSITION OBSTRUCTING FLUID FLOW BETWEEN EACH OF SAID CHANNEL MEANS AND SAID CHAMBER, AND STOP MEANS MOUNTED ON SAID CASING AND PROJECTING INTO THE INTERIOR THEREOF FOR STOPPING MOVEMENT OF SAID VALVE MEMBER IN RESPONSE TO THE URGING OF SAID BIASING MEANS WHEN SAID CIRCULATING MEANS HAS BEEN REMOVED FROM SAID CHAMBER, SAID VALVE MEMBER HAVING A PAIR OF PASSAGES LEADING TO SAID CIRCULATING MEANS, SAID PASSAGES EACH BEING IN ALIGNMENT WITH ONE OF SAID CHANNEL MEANS FOR ALLOWING FLUID FLOW BETWEEN SAID INLET CHANNEL MEANS AND SAID OUTLET CHANNEL MEANS WHEN SAID CIRCULATING MEANS IS IN THE FIRST POSITION, AND BEING MOVED OUT OF ALIGNMENT UPON SAID CIRCULATING MEANS BEING REMOVED.