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What is the ideal pressure control mode for a HPHT cubic press hydraulic system?
Release time：
2026-04-14
source：
The ideal pressure control mode for a cubic press hydraulic system is one that can achieve full-process pressure curve control. Specifically, it needs to meet the core requirements of the following three stages:
Controllable pressurization curve: In the pressurization stage, a controllable pressure curve can coordinate with the heating curve, thereby improving the effect of pressure transmission and reducing the generation of a pressure gradient in the synthesis cavity.
Increasing pressure curve during the pressure-holding stage: During the synthesis process, the phase transition of pressure-transmitting media such as pyrophyllite will degrade the pressure transmission performance, which in turn causes the pressure gradient to increase. Keeping the pressure curve increasing during this stage can effectively compensate for and reduce this impact.
Controllable pressure relief speed: By controlling the pressure relief speed, the system can accommodate the different requirements for pressure relief speed when it is in high-pressure and low-pressure states.
Currently, the pressure control mode using proportional valves is considered the solution closest to this ideal state. This mode utilizes a proportional pressure valve or a proportional flow valve in the system, which can continuously control the thrust and displacement of the electromagnet according to a set curve. It not only achieves continuously controllable speed in the pressurization stage and a continuous increase of system pressure in the pressure-holding stage, but also controls the pressure relief speed through programmed actions, truly realizing full-process curve control of pressure.
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