Backflow prevention devices
Backflow prevention valve
Backflow prevention valve
Backflow preventor with adjustable outflow direction
Backflow valve mounting and sealing device
Backflow-preventer
Backward flow prevention device
Backward flow prevention valve
Backwater valve
Bailer having leak-inhibiting seal
Bailer having leak-inhibiting seal
Balanced pressure valve
Balanced-flow gas safety valve
Ball and seat valve assembly and downhole pump utilizing the val
Ball and seat-type check valve for downhole rod pump
Ball and seat-type valve for downhole rod pump
Ball check valve
Ball check valve
Ball check valve
Ball check valve