ADJUSTING APPARATUS OF LOAD LIMITING VALVE FOR HYDRAULIC ACTUATOR

摘要

PURPOSE: An adjusting apparatus for a load limiting valve of a hydraulic actuator is provided to fix a spring on a cracking point by using a pressure control valve and a digital pressure gauge. CONSTITUTION: A hydraulic pressure reached a 'P' line passes an opening/shutting valve(3) of a compression side and a reduction valve(5) of the compression side by going in through a flow controller(1). The hydraulic pressure reaches an inlet of a load limiting valve(13) and displayed on a digital pressure gauge(7) of the compression side. Hydraulic pressure is increased to an adjusting pressure of the reduction valve of the compression side when the opening/shutting valve is opened. The load limiting valve is fixed when value of a digital flow meter(9) of a drain line shows a cracking point by opening a compression controller of the load limiting valve. Thereby, pressure value of the load limiting valve is placed to desired pressure. An adjusting operation for the compression side is finished by shutting the opening/shutting valve of the compression side. Hydraulic pressure is increased to an adjusting pressure of a reduction valve(6) of a tension side with reaching an inlet of a pressure control valve(15) after passing the reduction valve of the tension side when an opening/shutting valve(4) of the tension side is opened. Value of the load limiting valve is placed to desired value by stopping and fixing value of a digital flow meter(8) of the tension side at a cracking point during opening a controller of the tension side of the load limiting valve after adjusting the reduction valve. An operation for the load limiting valve for the tension side is finished when the opening/shutting valve is shut after adjusting pressure. Consequently, testing load is limited stably by adjusting the load limiting valve of the tension side and the compression side.