| 摘要 |
A fluid pressure relief valve has a pilot chamber, the pressure in which may be varied to determine the level at which the valve will open. A pilot flow path extends from the inlet through the pilot chamber to the outlet and has restrictions, both upstream and downstream, from the pilot chamber. The downstream restriction is pressure compensated to maintain a fixed rate of flow out of the pilot chamber. Upstream there is a fixed restriction and an electromagnetically variable restriction which enables the pressure at which the valve will open to be adjusted electrically to any value over a continuous range.
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