Clearance pocket assembly
Compressor with adjustable head clearance
Cylinder of piston compressor
Expansible chamber device
Hydraulic positioning and shock-absorbing apparatus
Pneumatic actuators with liquid seals for oil and gas well swabs
Pump stroke adjustment device
Seal assemblies
Servo controlled timing advance for unit pump or unit injector
Temperature-sensitive variation of the compression ratio in pist
Variable compression connecting rod
Very high pressure piston pump
Wobble piston and cylinder arrangement