Valve systems

A system, comprising:

• a first controllable valve configured to output a control pressure on one or more first pressure control lines;
• a second controllable valve configured to output a control pressure on one or more second pressure control lines;
• a transfer valve in fluid communication with the first controllable valve and the second controllable valve, wherein the transfer valve is configured to move between a first position, a second position, and a third position;
• and includes a housing and a spool positioned within the housing and configured to move within the housing between the first position, the second position, and the third position;
• and
• a hydraulic centering system operatively associated with and/or forming part of the transfer valve, wherein the hydraulic centering system is configured to hydraulically bias the transfer valve in opposite directions to maintain the transfer valve in the first position, and wherein the hydraulic centering system includes:
• a first high pressure centering port defined through the housing;
• a second high pressure centering port defined through the housing;
• and
• at least one low pressure centering port defined through the housing between the first high pressure centering port and the second high pressure centering port,
• wherein the first high pressure centering port is configured to be in fluid communication with a first centering control pressure line, and the second high pressure centering port is configured to be in fluid communication with a second centering pressure control line.