Plunger pumps use the reciprocating action of ceramic plungers to pressurize fluids and force them through outlet valves. The plunger is generally made out of durable and particularly resistant hard ceramic. In plunger pumps the plunger is attached to a rotor with a connecting rod so, when the ceramic plunger reciprocates out, it produces suction pressure. As the rotor turns, the plunger is pushed back down to send fluid through the outflow valve. One of the advantages of plunger pumps is that they can be used at much higher pressures than piston pumps.
 
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