apart looking now at fig3 the crosswise piece 23 has a lengthwise groove 23a in its outside face 23b there is a similar lengthwise groove 24a in the outside face 24b of the crosswise piece 24 the crosswise piece 25 has a lengthwise groove 25a along its inside face 25b and piece 26 has a similar lengthwise groove 26a along its inside face 26b another part of the valve assembly is an actuator unit that is capable of moving the connector member back and forth inside the valve frame the main part of the actuator unit is a shaft 27 that is threaded at one end as indicated at 27a see fig1 and a flange 28 is mounted near the center of the shaft referring to fig1 and 3 the threaded part 27a of shaft 27 is enclosed by a bonnet member 29 which is fastened at one end to the front wall 11 of the valve frame a handwheel 30 is threaded onto the threaded end 27a of shaft 27 and it seats down against bonnet 29 the flange 28 on shaft 27 seats into groove 25a and 26a fig3 on the center crosspiece 25 and 26 respectively the valve assembly includes two coupler members one of the coupler members is made up of a flange 31 with a hub 31a on one side of the flange and a hub 31b on the other side the other coupler member consists of a flange 32 with a hub 32a on one side of the flange and a hub 32b on the other side the outlet valve 15 has a valve stem 33 that fastens into the hub 31a on flange 31 on the other side of the flange the outlet valve 18 has a valve stem.