Traditional 3-position valves accomplish vacuum isolation and rough pressure control via an adjustable air cylinder. Nor-Cal Products’ 3-position throttling pendulum valve uses the patented Intellisys™ closed loop control technology to provide much better set-point accuracy and repeatability, anywhere from 0.1 to 99.9% of stroke. Simple TTL inputs are used to trigger the controller and valve to go open, closed or to the third position – much in the same manner a 3-position air cylinder would be commanded using solenoid pilot valves. Alternatively, an RS-232 communications link is available for remote control and set-up to users who prefer this method of interface over the manual local mode.
IntellisysTM components fulfill downstream pressure control system with high-performance, closed-loop motor control throttling butterfly, pendulum, and gate valves, controllers and pressure gauges. A user can choose from stand-alone buried box or on-valve DSP-powered adaptive pressure controllers compatible with many available host communications interfaces such as DeviceNet, Ethernet, EtherCAT, RS-232, RS-485, and Analog/TTL. A Universal valve drive, a motor drive product, can be tailored to fit most other manufacturers’ valves to greatly improve their pressure control performance at a reduced cost.
