the end 72 of the valve element 68 into and out of the port 74 when the end of 72 is within the port 74 it will be appreciated that fluid communication between the chambers 64 and 78 is halted this is as shown in fig5 however when the end 72 is spaced from the port 74 as is shown in fig2 4 inclusive fluid flow from the chamber 78 to the chamber 64 between the fingers 120 is permitted the opening 110 in the third housing component 20 includes depending fingers 122 which serve to slidably embrace the cylindrical surface 118 on the valve element 98 to guide the same in this case the end 104 of the second valve element 98 never seals against the seat but moves sufficiently close to the opening 110 as to throttle flow through the inlet defined thereby when in the position illustrated in fig3 5 inclusive in the position shown in fig2 full flow through the inlet 110 is allowed still referring to fig7 it is to be observed that the second housing component 118 includes a radially outwardly directed projection 124 this projection can be used to align in a slot 126.