and a fail-safe solenoid valve system having a secondary internal flow path connecting to and extending from the primary internal flow path to a second outlet port opening into at least one of the outside chambers, and a normally closed solenoid valve in the secondary flow path preventing flow...
Once the power is lost or removed, the controlled valve or damper will be driven to a fail-safe position (either Fail OPEN or fail Closed) in either clockwise (CW, standard) or counter clock wise (CCW, optional) rotation. In addition to standard open/close (two-position) control, ...
and a cut valve 20 is closed instantaneously with the trouble by controlling a current conduction value IF in the solenoid 20a less than a valve opening current value, preventing a pressure in an actuator chamber 5b or 5a from instan... E Takaaki 被引量: 0发表: 1990年 加载更多引用...
HEA-P series spring return electric actuator is designed for fail-safe positioning of valves or dampers upon loss of supply voltage .Mechanical spring return design is used to position controlled devices to either fully open or fully closed positions without...
In addition, even if the throttle valve 4 is being suddenly opened, if it is decided at the step S23 that the accelerator pedal opening degree .theta..sub.AP indicates the fully-closed state, the number N.sub.FC of the fuel-cut cylinders is reset at 0 (zero) at a step S24 and ...
By opening the doors to the closed system through universal OPC Server connectivity, companies have already seen the benefits of this information availability. When a chemical processing facility in Malaysia noticed an abnormally high failure rate and unscheduled down ...
摘要: PROBLEM TO BE SOLVED: To prevent battery exhaustion or engine overheating by starting an electric fan when any trouble of water temp. is detected in a fail-safe processing method for water temp. sensor for controlling the electric fan cooling the engine of a vehicle....
It has been demonstrated that the control current for opening a safety brake from the closed state needs to be higher than that for holding the brake in the open (released) state. The present refinement makes use of this effect to reduce the control voltage after termination of the opening ...
A solenoid having a first open state in the absence of an applied electric current and a second closed state in the presence of an applied electric current is incorporated into the motor-operator unit of an overhead door. Brake actuator utilizes the spring force of a normally disengaged brake...
mechanically linking said second member to move back and forth in response to changes in accelerator position and spring-biasing it by a second force toward the throttle-closed direction of movement against a predetermined stop in the accelerator idle position, said second force being greater than ...