Valve Positioner & Actuators

Valves Positioner & Actuators

Type PA35 - Multi-Spring Pneumatic Actuator

Multi-Spring Pneumatic Actuator

The PA35 actuator is a 35 square-inch 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 actuator comes with either 3 springs for a 3…15 psi signal range or 6 springs for a 6…30 psi signal range. Both ranges are adjustable to match bench loading with the requirements for your application. The yoke and the actuator housings are made of carbon steel and coated with epoxy for corrosion resistance.

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 Type PA35 - Multi-Spring Pneumatic Actuator

Type 754 - Actuator Assembly

Actuator Assembly

The Type 754 actuator 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 to fit the 1/4" valve and a larger version to fit the 1/2" through 1" valves. It provides smooth linear retraction of the valve stem upon an increasing instrument signal. A decrease in instrument signal causes the stem to extend and close the valve. Downward closing force is generated by the spring, bearing on the diaphragm plate. An increasing pressure in the diaphragm cavity opposes the force of the spring and retracts the stem, opening the valve. The unit is designed to extend the stem, closing the valve, should the instrument signal fail. The 1/4" size 754 actuator normally operates in response to a 3…15 psi change in instrument signal, or a 12 psi range. This signal range causes the valve to stroke a distance of approximately 7/16". The standard spring has a deflection rate of 25 pounds per 1/8" and operates against an effective diaphragm area of approximately 7.3 square inches. The 1/2" size 754 actuator also normally operates in response to a 3…15 psi change in instrument signal, or a 12 psi range. This signal range causes the valve to stroke a distance of approximately 9/16". The standard spring in the 1/2" unit has a deflection rate of 30 pound per 1/8" and operates against an effective diaphragm area of approximately 11.25 square inches.

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Type 754 - Actuator Assembly

Type 755 - Actuator

Actuator

The Type 755 actuator 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 to fit the 1/4 in. (6 mm) valve and a larger version to fit the 1/2…1 in. (12…25 mm) valves. It provides smooth linear extension of the valve stem upon an increasing instrument signal. A decrease in instrument signal causes the stem to retract and open the valve. Downward closing force is generated by instrument air on top of the diaphragm. An increasing pressure in the diaphragm cavity opposes the force of the spring and extends the stem, closing the valve. The unit is designed to retract the stem, opening the valve, should the instrument signal fail. The 1/4 in. (6 mm) size 755 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. This signal range causes the valve to stroke a distance of approximately 7/16 in. (11 mm). The standard spring has a deflection rate of 25 pounds per 1/8 in. (3 mm) and operates against an effective diaphragm area of approximately 7 in.2 (4516 mm2). The 1/2 in. (12 mm) size 755 actuator also normally operates in response to a 3…15 psi change in instrument signal, or a 12 psi (0.8 bar) range. This signal range causes the valve to stroke a distance of approximately 9/16 in. (14 mm). The standard spring in the 1/2 in. (12 mm) unit has a deflection rate of 30 pounds per 1/8 in. (3 mm) and operates against an effective diaphragm area of approximately 11 in.2 (7096 mm2).

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Type 755 - Actuator

Model EVA-100-200 - Electronic Valve Actuator

Electronic Valve Actuator

The EVA-100 and EVA-200 are multi-featured actuators with the capability to accept analog control signals. The design provides smooth, highly accurate positioning, with positive position-lock when not in motion. These rugged actuators will withstand the most adverse environmental conditions. The EVA-100 and EVA‑200 were developed specifically to fit all Research Control Valves including the larger Model 9000 and 9100. Their accurate positioning and high thrust makes them well suited for all research and process applications.

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Model EVA-100-200 - Electronic Valve Actuator

Type 759 - Positioner Actuator

Positioner Actuator- Type 759

The Type 759 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" valve and another larger version for the 1/2" through 1" valves. The unit, when equipped with the model TLDA positioner, functions as an air-to-close actuator extending the stem and closing the valve on an increasing instrument signal. The unit is designed to retract the stem, opening the valve, on a decreasing or loss of instrument signal. A force-balance system is incorporated utilising the full force of the supply air to position the stem precisely and with a high degree of repeatability. This type 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.

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 Type 759 - Positioner Actuator

Type 766 - Positioner Actuator

Positioner 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" valve and another larger version for the 1/2" through 1" 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 decreasing or loss of instrument signal. A force-balance system is incorporated utilizing the full force of the supply air to position the stem precisely and with a high degree of repeatability. This type 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.

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Type 766 - Positioner Actuator

SRD991 - Side Mount Valve Positioners

Side Mount Valve Positioners

The SRD991 Intelligent Valve Positioner offers the most advanced technology available on the market today. The technology includes, among others, an infrared interface for wireless operation and configuration, a multi-lingual 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. All the diagnostics features can be easily configured and displayed by the Positioner DTM (VALcare). Moreover, the Positioner DTM enables editing a complete health report of the valve with all data of configuration and diagnostics. The SRD991 also has the capability to control a Partial Stroke Test (PST) that offers operators a tool to identify the trouble-free function of ESD (Emergency Shut Down) valves.

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SRD991 - Side Mount Valve Positioners

SRI990 - Valve Positioner

Valve Positioner- SRI990 

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.

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SRI990 - Valve Positioner 

Valve Positioner

Valve Positioner

This product is a rugged stainless steel housing and an extensive choice of electronic boards from SRI990 or SRD991. Special design for offshore applications and for food and beverage industries. Features an electronic board from the SRD991 digital valve positioner that is easy to operate, menu-driven with graphical LCD, has a Multilingual full text display, backlighted for easy reading. All parameters can be configured locally by push button, status and diagnostic messages displayed in LCD, HART Protocol with only 420 ohms load, PROFIBUS-PA acc. to IEC 1158-2 based on FISCO and FOUNDATION Fieldbus H1 acc. to IEC 1158-2 based on FISCO with PID, AO, 2xDI, DO function blocks and LAS functionality. The electronic board from the SRI990 analog valve positioner; Analog valve control with fast control behaviour & electrical adaption of zero and span by potentiometers. The modular concept of the positioners SRI990 – SRD991 allows easy mounting to all linear and rotary actuators.

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Valve Positioner

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