Fluid sample pump system

A method of collection of pressurized fixed volume fluid samples, comprising the steps of:

• providing a stream of pressurized actuation air from a source;
• periodically injecting a liquid lubricant into the stream;
• passing the stream through a pressure relief valve to prevent over-pressurization;
• periodically passing a fixed volume of the stream to a centered input/output feedthrough to a pneumatically actuated pump housing including a friction reducing coating, a piston including a piston head, a shot peened, zinc coated Music Wire compression piston head return spring, a piston plunger, a piston plunger chamber, a sample inlet, and a pressurized sample outlet;
• compressing the piston head against the piston head return spring and pressurizing a fixed volume of sample fluid introduced through the sample inlet by the piston plunger;
• passing the pressurized sample fluid to the pressurized sample outlet;
• passing the pressurized sample fluid to a sample collection cylinder;
• and
• exhausting the stream through the input/output feedthrough to decompress the piston head and piston head return spring and draw a fixed volume of sample fluid into the piston plunger chamber through the sample inlet.