機器
air
air piping
background
bar
black
boiler
closeup
concept
control
device
dial
engineering
equipment
factory
faucet
fuel
gas
gauge
high pressure
industrial
industry
instrument
line
manometer
measure
metal
meter
oil
old
pipe
pipeline
plant
plumbing
power
pressure
psi
pump
service
steel
supply
system
technical
technology
tool
valve
vertical
water