A Non-conventional Design of Intensifier Pumps
One of our goals in publishing these short articles is to rediscover great ideas buried in time. In this issue your attention is directed to a non-conventional intensifier design reported by Bowen * 34 years ago.
This design used a cam to time the stroking of the two plungers (see diagram below). A pre-compression stroke driven by the cam allows one cylinder starts discharging fluid when the other one stops. Test results with just a short tubing between the two cylinders showed that the pressure fluctuation was within 150 psi for an output pressure of 30,000 psi. Tests have been done from 15,000 to 60,000 psi.
A special dynamic seal design was also used. A separate seal fluid, which becomes more viscous as the pressure is increased, was pumped, at a higher pressure, into the dynamic seal assembly to create a seal for water and a hydrostatic bearing to center the piston in the cylinder. Test with this seal design along with tungsten carbide plunger/bushings was run at 45,000 psi for 2,000 hours.
A four-way valve design with an open center and two different designs of check valves were also discussed in this paper.
* Bowen, John, “An approach to pulseless
packingless pumping.” Proceedings of the First
International Symposium on Jet Cutting Technology,
Beyond High Pressure
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