Fig. 1-11 HP Trip Module Schematic5.3.4 Hydraulic Servo System in the HP Fire-resistant Oil System 1 The hydraulic servo system is composed of valve pedestal and servomotor, which is mainly designed with following functions:1.1 Control the opening of valveThe system is provide with four HP regulating valve servomotors, two HP main stop valve servomotors, two IP main stop valve servomotors and two IP regulating valve servomotors. The HP and IP regulating valve servomotors are continuously controlled by the electro-hydraulic servo valve; HP main stop valve servomotor and IP main stop valve servomotor are controlled by solenoid valve in the way of two-position control
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