The liquid pressure capacity of a chemical injector pump is increased substantially by using high pressure gas to drive the gas motor. Cast Steel Valves In one embodiment, the chemical injector pump includes a liquid pump end, a gas motor end, a low pressure position responsive valve, and a high pressure pilot operated valve manipulated by the low pressure valve for delivering high pressure gas to the gas motor. In other embodiments, Water Pump Control Valvesthe chemical injector pump includes a liquid pump end, a gas motor end, and a high pressure position responsive valve for directly delivering high pressure gas to the gas motor.

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2011-11-25

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