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Control Valve
SRI990 RCV Analog Positioner
DESCRIPTION
The SRI990 RCV Analog Positioner with analog input 4…20 mA is designed to operate pneumatic valve actuators. It offers an easy adjustment by means of switches and potentiometers. The modular structure of this positioner series enables conversion from an analog to an “intelligent” positioner by exchanging the electronics.
SRD991 RCV Intelligent Valve Positioner
DESCRIPTION
The top-mounted SRD991 digital positioner is integral with the Type 766 actuator, spring opposed diaphragm actuator designed specifically to fit the Research Control Valve body-bonnet assembly. The unique positioner is compatible for both the 1/4 in. and 1/2 in. actuator.
SRD960 RCV Universal Positioner
DESCRIPTION
The SRD960 RCV Universal Positioner offers the most advanced technology available on the market today. This includes among others an infrared interface for wireless operation and configuration, a multilingual full-text graphic LCD, and an availability with the choice of all in the process automation applied communication protocols. It offers enhanced applications and methods to analyze recorded stroke data.
BLRA Pneumatic Actuator (Type 766)
DESCRIPTION
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.
FUNCTION
The Type 766 actuator normally operates in response to a 3…15 psi (0.2…1 bar) change in instrument signal or a 12 psi
(0.8 bar) range. The span, or range, of the instrument signal, is determined by the feedback range spring mounted directly under the positioner. The feedback range spring is responsible for sensing the position of the main diaphragm as the instrument signal
changes. The position is then transmitted through the spring, directly to the positioner diaphragm assembly. The valve spring, visible in the yoke area, provides the downward thrust necessary to counteract forces created within the valve. Consideration should be given to the amount of preload required for proper operation since the main valve spring only provides downward force.
Actuator, Pneumatic (Type PA58)
DESCRIPTION
The PA58 actuator is a pneumatic, multi-spring diaphragm actuator designed specifically to fit the RCV product line. The actuator can
be used with a wide range of valve solutions from larger process valves to high-pressure applications. The actuator is field reversible
(without additional parts) allowing flexibility within the field. This actuator is available air-to-open or air-to-close. The yoke and the actuator housings are made of carbon steel and coated with epoxy for corrosion resistance.
FUNCTION
The PA58 actuator normally operates in response to a 24 psi range. The signal range causes the valve to stroke a distance of
approximately 1 inch. Depending on the associated RCV valve, a positioner is needed if a shorter stroke is necessary.
STANDARD FEATURES
- Reversible in the field (without additional parts)
- Heavy duty construction
- Powder coated for increased corrosion resistance
- Simple design for easy maintenance