The best replacement for valve is tube.

The best alternatives to valve are rated as following:
★★★★★  tube
★★★★  ball valve
★★★★  gate valve
★★★  solid state
★★★  24 valve cummins
★★  mechanical valve
★★  transistor
★  schrader valve
★  24 valve
★  ea
★  blizzard
★  riot
★  tissue valve
★  solid state amp
★  transistor amp
★  orifice
★  regulator
★  breather
★  bungie
★  manifold
★  activision
★  plug valve
★  oculus
★  mixing valve
★  transistor amplifier
★  bov
★  yoke valve
★  orifice tube
  blizzard dota
  check valve
  pig valve
  bicuspid valve
  presta valve
  globe valve
  foot valve
  wastegate
  bethesda
  overhead cam
  4 valve
  stopcock
  aortic valve
  relief valve
  presta
  mechanical
  non power valve
  slide trombone
  schrader
  rockstar
  diverter valve
  bioware
  zynga
  solid valve
  pulmonary valve
  flushometer

Your alternative for valve is not listed? Suggest!
Speaking about valve, one probably shouldn't forget about actuator.

Other search terms related to valve and their ratings are:
★★★★★ actuator
★★★★★ drain
★★★★ timer
★★★★ diverter
★★★★ stops
★★★ flow control
★★ compression fitting
★★ strainer
★★ turbo
★ limit switch
★ tamper switch
★ anticoagulation
★ that of the pulmonary valve
★ regurgitation
pulmonary valve
bleed
flow meter
electric actuator
aortic stenosis
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Google Trends

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valve
tube
ball valve