Importance

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Abstract

A pilot mechanism for a pressure regulating valve having a relatively high pressure inlet, a relatively low pressure outlet and main valve pressure responsive means for operating the main valve to control the pressure of the fluid downstream of the main valve. The pilot mechanism comprises pilot valve means for supplying a loading fluid to one side of the main valve pressure responsive means. A normally closed bleed leakage path is provided in communication with the loading fluid supplied to the main valve pressure responsive means for directing loading fluid away from the main valve pressure responsive means when the bleed path is opened. Second pressure responsive means are provided responsive to the pressure of the fluid to be controlled for controlling the position of the pilot valve means to in turn control the flow of loading fluid supplied to the main valve pressure responsive means. The second pressure responsive means includes bleed control means responsive to a predetermined increase in the pressure of the fluid to be controlled for opening the bleed leakage path to rapidly reduce the pressure of the loading fluid operating on the main valve pressure responsive means. In this way, a quicker, more rapid response to changes in the pressure of the fluid to be controlled may be achieved.

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First Claim