Sensor for a variable displacement pump

Short reverse rotation of compressor at startup

Short reverse rotation of scroll compressor at startup

Single-pump multiple stroke proportioning for gradient elution l

Siphon-controlled pneumatic displacement pump

Slam prevention in liquid pumping

Sludge Pump

Sludge pump with management system

Slurry pump system - method for preventing slurry from entering

Slurry pumping method and apparatus

Slurry transfer and densification through vacuum pumping

Sonic or energy wave generator and modulator

Sonic pump for pumping wells and the like employing dual transmi

Standing wave excitation cavity fluid pump method of operation

Starting method for scroll-type compressor

Sub-sea pumping system and an associated method including pressu

Submersed jet pump method for generating a stream of water

Subsurface pumping unit incorporating heavy duty reversing valve

Subsurface stuffing box assembly

Sucker rod actuating device