bore and flow passage 15b is provided therethrough upper connector 14 is connected to upper housing 18 at thread 19 and sealed with seal 20 housing 18 is provided with internal shoulder 21 on opposite sides of which press operator spring 17 and piston spring 22 the lower end of piston spring 22 presses through ring 23 on the upper end of piston 24 a seal 25 is provided in internal shoulder 26 in lower housing 27 slidably sealing piston 24 to housing 27 at least one port 27a is provided in housing 27 a seal 28 is also provided for sealing upper housing 18 to lower housing 27 above their connecting threads 29 another seal 30 in piston 24 slidably seals it to the outside of operator tube 15 an internal bore 31 is provided in the lower end of piston 24 and groove 32 is formed in the outside of operator tube 15 collet 33 with arm lug portions 34 is installed over the upper end of insert 35 and retained thereon by set screws 36 seal 37 slidably seals insert 35 to operating tube 15 lower connector 38 is connected to lower housing 27 at threads 39 and sealed to insert 35 with seal 40 at least one port 41 is provided in operating tube 15 a chamfered shoulder 42 is formed on the lower end of insert 35 engageable by secondary valve surface 43a formed on seat member 43 seat member 43 is connected to operator tube 15 with threads 44 the construction and operation of ball valve device 45 housed in lower connection 38 is described in u s pat no 4 140 153 the ball valve device 45 includes shoulder 42 seat member.