is integrally formed with the connecting block 36 as shown in fig3 and 4 the lower end of the rod 37 has a reduced diameter tip and an internally threaded bore as shown in fig2 the valve element 22 is mounted on the reduced diameter tip of the rod 37 by a bolt that is threaded into the tip of the rod in this way the valve element 22 is connected with the bellows so that the valve element is displaced vertically when the bellows expand or contract in fig3 the bellows 35 is illustrated in an extended position which corresponds to the valve being opened as illustrated in fig2 in fig4 the bellows is illustrated in a contracted position which corresponds to the valve being closed so that the valve element 22 seals against the valve seat 23 referring to fig2 preferably an alignment ring 49 for supporting and aligning the rod 37 is disposed in the lower housing 15 the alignment ring has a central bore corresponding to the external diameter of the rod 37 forming a sliding fit between the rod and the central bore of the ring the alignment ring 49 also includes a plurality of holes so that fluid can flow.