초록 ▼

A valve actuation system is provided for a valve of the type wherein at least two separate movements are utilized to achieve either opening or closing thereof. The actuation system includes a pair of hydraulic or pneumatic actuator units for automatically performing these two separate operations. An

A valve actuation system is provided for a valve of the type wherein at least two separate movements are utilized to achieve either opening or closing thereof. The actuation system includes a pair of hydraulic or pneumatic actuator units for automatically performing these two separate operations. An electrically energizable control valve is associated with each of these actuators for controlling the flow of a pressurized control medium therethrough to achieve actuation in the proper sequence for attaining the desired valve movement. A control circuit preferably comprises a plurality of switches responsive to the positions of these two valve actuators as well as the position, (viz., “valve open”or “valve close”) of an operator accessible main control lever or switch. These switches deliver electrical power to energize the fluid flow control valves so as to automatically perform the correct sequence of actuator operations to open or close the valve, as desired.

대표청구항 ▼

An actuation system for a valve having a compound movement requiring actuation in a predetermined sequence of at least two independent valve control members to achieve either opening or closing of the valve, said actuation system comprising: first and second actuator means for respectively actuating

An actuation system for a valve having a compound movement requiring actuation in a predetermined sequence of at least two independent valve control members to achieve either opening or closing of the valve, said actuation system comprising: first and second actuator means for respectively actuating said two independent valve control members, electrically energizable actuator control means for controlling the operation of said first and second actuator means, master control means actuatable by an operator to an open position and to a close position, and electrical control circuit means responsive to said operator actuatable master control means for energizing said electrically energizable actuator control means in a predetermined fashion so as to automatically achieve said predetermined sequence of actuation of said valve control members for opening and closing of the valve in accordance with the position of the operator actuatable control means, wherein said first actuator means raises and lowers the valve member from and to a seal position, respectively, and said second actuator means rotates the valve member to an open and close position.