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SOMAS
Pneumatic actuator

Pneumatic actuator

Product catalog summary

Overview: The document provides detailed information on the SOMAS Type A pneumatic actuators, which are designed for both control and on/off applications. These actuators are compatible with the SOMAS range of valves and most 90° rotary valves.

Types of Actuators:

Double-acting actuator (Type A – DA): Requires air supply for both opening and closing.
Single-acting actuator (Type A – SC/SO): Utilizes a spring mechanism for fail-safe operations, either spring to close (SC) or spring to open (SO).

Design Features:

Compact design with patented backlash-free torque transmission.
Low friction seals and optimized torque curve for efficient performance.
Standardized connections compliant with ISO 5211 and VDI/VDE 3845.

Torque and Performance:

Designed to meet the torque demands of ball segment, butterfly, and ball valves.
Low starting torque due to low-friction seals.
Adjustable travel stops for both open and closed positions.

Mounting and Configuration:

Standard mounting is perpendicular to the pipeline, with alternative positions available upon request.
Actuator selection tables provided for different valve types and air supply pressures.

Accessories and Options:

Various accessories available, including positioners, solenoid valves, and limit switches.
Design options include ATEX design, high temperature design, hand operation, and more.

Technical Specifications:

Detailed tables for actuator selection based on valve type, size, and air supply pressure.
Specifications for cylinder volume, torque, and mounting dimensions.

Specifications: The document provides detailed specifications for pneumatic actuators, including weight, mounting patterns according to ISO 5211, and material specifications. The actuators are made from aluminium with Duasolid paint, EN 1.4305 tie rods, carbon-filled PTFE piston seals, and acidproof steel screws/nuts. The air supply required is between 4 - 8 bar, with a rotary motion of up to 95° and adjustable travel stops. The standard ambient temperature range is -40 to +90°C, with an option for up to +120°C using Viton O-rings.

Procedures: The document outlines the ordering procedure for pneumatic double-acting actuators, specifying the need to include the mounting kit required for the valve type. It also provides an example of how to order, using the type designation and actuator type.

Options and Features: Various options are available for the actuators, including ATEX design, high temperature design, hand operation, locking devices, larger air connections, special designs, bronze bushings, and reinforced structures. The actuators can be double-acting or single-acting with different spring configurations.

Technical Specifications: The actuators are designed for rotary motion with adjustable travel stops and are suitable for a wide range of ambient temperatures. The document emphasizes that SOMAS reserves the right to make improvements without prior notice.

Contact Information: SOMAS AB is located in Säffle, Sweden, with contact details provided for phone, fax, and email.

Catalog excerpts

Edition: 2008-12 50)to optimize control performance and eliminate backlash. The actuators are designed to fit valves and accessories with the ISO 5211 and VDI/VDE 3845.SOMAS actuators have a torque curve corresponding to the torque demand for ball segment, butterfly, and ball valves. Low-friction seals allow for a low starting torque. Single- or dual- cylinder units are used depending on the required torque and air supply pressure. Single-acting actuators are optimised according to compact dimensions. The springs are supplied in a cartridge to reduce the risk of injury and to simplify maintenance.Adjustable travel stops are provided for both open and closed positions. SOMAS actuators are designed for optimal function in control and on/off applications. The type A pneumatic actuators are specifically made to fit the SOMAS range of valves. They can also be used with most 90 rotary valves. The A-DA actuator is double- acting and the A-SC and A-SO actuators are single-acting spring return for fail safe operation.SOMAS offer a patented backlash-free transmission friction coupling (valid for D (spring to close) Type A Ж SC Single-acting actuator Double-acting actuator Type A DA Single-acting actuator (spring to open) Type A ֖ SO > Compact designPatented backlash-free torque transmissionLow friction seals Optimized torque curve Standardised connections between valve and accessories size="-1">

Open the catalog to page 1

Option E = ATEX design H = High temperature design HM = Hand operated LC = Locking device (closed position) V = Larger air connections X = Special design B = Bronze bushing in lever R = Reinforced Mounting pattern for valve attachment (according to ISO 5211)Shaft diameterFunction: DA = Double-acting actuator SC = Single-acting actuator (spring to close) SO = Single-acting actuator (spring to open) SCL = Single-acting actuator (spring to close), low air supply design SOL = Single-acting actuator (spring to open), low air supply design Actuator size according to the selection tableActuator type...

Open the catalog to page 8

Pneumatic actuator

Pneumatic actuator

Catalog excerpts

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