BLRA Pneumatic Actuator (Type 766)
The Type 766 actuator with integral, top-mounted positioner is a pneumatically operated, spring-opposed diaphragm actuator designed specifically to fit the Research Control Valve body-bonnet assembly. The unit is available in two sizes: one for the 1/4 in. (6 mm) valve and another larger version for the 1/2…1 in. (12…25 mm) valves. The unit, when equipped with the model BLRA positioner, functions as an air-to-open actuator retracting the stem and opening the valve on an increasing instrument signal. The unit is designed to extend the stem, closing the valve, on a decrease or loss of instrument signal. A force-balance system is incorporated using the full force of the supply air to position the stem precisely and with a high degree of repeatability. This type of actuator should be used when the application calls for high positioning accuracy or when greater force is required over the standard actuator such as in the case of high shutoff pressures or excess packing friction.
- Actuator type: Pneumatic, spring-opposed diaphragm with top-mounted positioner.
- Valve compatibility: Fits Badger Meter Research Control Valve body-bonnet assemblies.
- Sizes: Two options: 1/4″ valves and 1/2″–1″ valves.
- Operation: Air-to-open (ATO) – retracts stem to open, extends to close on signal decrease or loss.
- Precision: Force-balance system for high positioning accuracy and repeatability under varying pressures.
- Performance: Suitable for high-accuracy or high-force applications (e.g., high shutoff pressures or packing friction).
- Construction: Die-cast aluminum body with epoxy coating.
- Signal range: Standard 3–15 psi (0.2–1 bar), optional 0.2–0.6 bar or 0.6–1.0 bar.
- Temperature range: Standard –30 to 70°C; optional –30 to 150°C.
- Refining, Chemical & Petrochemical: General flow and pressure control, including additive injection.
- Aviation & Aerospace: Precise control in test equipment and services.
- Research & Laboratories: Accurate and repeatable flow control for R&D environments.
- Biotechnology & Pharmaceuticals: Automated control in sanitary processes (CIP/SIP).
- Oil & Gas: Critical measurement and flow regulation in exploration, production, and transportation.
- Size range (compatible valves): 6.4–25 mm (1/4–1 in)
- Ambient temperature range: –30 to 70°C (–20 to 150°F)
- Positioner signal range: 0.2–1 bar (3–15 psi)
- Minimum supply pressure: ~1.5 bar (~22 psig)
- Maximum supply pressure: 4 bar (60 psig)
- Diaphragm effective area: 1/4″ unit: 47 cm² (7.3 in²); 1/2″ unit: 73 cm² (11.3 in²)
- Operation: Air-to-open (spring-to-close on air failure)
