Patent ID: 7409965
Filing Date: 2008-08-12
Classification: F01D,Y10T

Abstract:
1. A direct acting hydraulic voting trip block comprising: a valve block having three valve cylinders therein; three valve pistons in the valve cylinders; three springs for biasing the valve pistons in non-activated position; three electric solenoid actuators for in response to a non-fault signal moving the piston against the bias of the springs into an activated position; said valve block defining three separate paths between an inlet port and an outlet port, each path intersecting the three valve cylinders; each valve piston being configured to, in the activated position, obstruct two of the three paths and each valve piston being uniquely configured to obstruct a different two of the three paths; whereby as long as at least two of the pistons are in the activated position communication between the inlet and outlet ports is prevented.