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About actuatorsTwo position valves switch back and forth between Load and Inject, or Position A and Position B. Multiposition valves operate in continuous revolutions by incremental steps. There are several ways to actuate each type of valve, along with a number of supporting controllers and devices to interface the actuators with computer-controlled systems. With the exception of low pressure Cheminert multiposition valves, we recommend that multiposition valves be purchased with air or electric actuators. While a manual detent assembly is available, the higher turning torque of our other multiposition valve designs makes them more difficult to position accurately by hand.
Manual actuationSimplicity and low cost are the main advantages of manual actuation. Some models can be ordered with position feedback, an option which sends a signal to start a data system when the valve is switched.
Closemount
Air actuatorsAir actuators are useful in situations where any spark could be disastrous, where heat could be a problem for electric actuators, or where there is no electricity available. They are small, relatively inexpensive, very rugged and dependable, and field-serviceable. Low gas consumption and lightweight, compact construction make the air actuator suitable for aerospace flight hardware applications as well as laboratory or process applications. With the addition of a DVI (digital valve interface) to translate the timed event signals into the necessary air pulses, air actuators can be automatically switched by a data system, integrator, or controller such as our DVSP (digital valve sequence programmer) or SVI (serial valve interface).
Two position
Microelectric actuatorsThe microelectric actuator features automatic valve alignment, high-speed switching, compact size, 24 VDC power input, and reversible direction (in the multiposition model). Both microelectric and standard electric actuators can be operated manually with a controller assembly that features position-indicating LEDs and a toggle switch, but one of the biggest advantages of electric actuators over air is the ease with which they can be connected to an external data system for fully automated control. The microelectric actuator has built-in multidrop RS-232 (RS-485 optional) for bidirectional communications. The SVI (serial valve interface) was designed specifically to interface our standard electric actuators with RS-232 compatible systems, allowing control of up to six actuators via modem, BASIC program, or Valco-supplied PC software.
Two position
Standard electric actuatorsIf lower cost outranks those factors in your consideration, our standard electric actuator (110/230 VAC) offers a dependable, economical solution. Standard electric actuators can be operated manually with a controller assembly that features position-indicating LEDs and a toggle switch, and can be easily connected to an external data system for fully automated control.
Two position
Standoff assembliesAll valves, no matter what their actuation mode, can be ordered with a standoff assembly. The standoff is an extension shaft mounted between the handle or actuator and the valve, allowing the valve to be installed within a heated zone while the actuator or handle remains outside at ambient temperature. The standoff extends through the oven wall, and is secured by a clamp ring supplied with the assembly. Standard standoff assembly lengths are 2", 3", 4", and 6". Other lengths can be special-ordered at additional cost.
Standoff assemblies for actuators
Right angle driveSome installations dont allow the valve and actuator to be installed in a typical in-line configuration. The RAD (right angle drive) is a 90° gearbox which permits the actuator or handle to be installed at a right angle to the valve. The RAD fits all VICI electric and air actuators. Actuator controllers and interfaces
Feature chart Valve accessories
Purge housings Valve mounting hardware
What hardware do I need? Further reference |
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