Two position valves switch back and forth between Load and Inject, or Position A and Position B. Selectors ( 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.
Universal electric actuator
The universal actuator allows instrument manufacturers to use a single motor and control software to operate virtually any Valco or Cheminert rotary valve - two position or selector.
![universal valve actuator](images/universal-actuator.jpg)
Modular Universal actuator
The Modular Universal offers the same functionality as the Universal, in a flexible design that lets you mount the motor and electronics in different locations
![microelectric valve actuator](images/modular-actuator.png)
Air actuators
Air actuators are useful in situations where any spark could be disastrous, where heat could compromise an electric actuator, or where electricity just isn't available.
![pneumatic valve actuator](images/air-actuators.jpg)
Microelectric actuators
Microelectric actuatorsfeature automatic valve alignment, high-speed switching, and compact size.
![microelectric valve actuator](images/microelectric.jpg)
Mounting hardware
Valves in ovens require a standoff assembly to keep the actuator out of the heated zone. If a valve is not going to be heated beyond the temperature range of the actuator, closemount hardware often makes the cleanest installation.
![universal valve actuator](images/closemount-hardware.jpg)