Corrosion resistant SR-75 Single Acting Rotary Pneumatic Actuator spring return

► Technical data

Rotation angle: 0° to 90°
Air pressure:2.5~8bar(Double acting), 3~8bar(Single acting)
Operating ambient temperature: Standard Type:-20°C~+80°C
High temperature Type: 0°C~+180°C
Low temperature Type: -45°C~+60°C
Max Working Pressure:10bar
Pressure: 5 to 10 bar
Work media: Air (PNEUROP/ISO Class 4)
Connections: ISO 5211 for brackets
DIN 3337 coupling (star shaped)
VDI/VDE 3845 for accessories
NAMUR for work media
Air supply: 1/4″ – BSPP
Surface material: Hard anodized – 40μm
Life time: One million times
Accessories: positioner, Air Filter Regulator, lock up valve, travel switch, handwheel, etc…

► Features

Rack & pinion design

Compact and light weight

ISO 5211 mounting pattern

Adjustable stops for both open and closed positions

Accessory mounting dimensions to NAMUR specifications

Machined gear teeth provide longest life and smoother operation

High cycle life with low friction bearings on all moving and sliding surfaces

Safety contained springs prevent hazards of inadvertent ejection during maintenance

Corrosion resistant with hard anodized body, PTFE coated end caps, and stainless steel fasteners

Modular design utilizing same body and end caps for both double-acting and spring-return versions

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► The suggested safety factor for spring return actuator under normal working conditions is 30%-50%

Example:

The torque needed by valve=80N.m

The torque consider safety factor(1+30%)=104N.m

Air supply=5Bar

According to the table of spring return actuators’ output, we find output torque of SR 140K7 is:

Air stroke 0°=308N.m

Air stroke 90°=247N.m

Spring stroke 90°=180N.m

Spring stroke 0°=120N.m

All the output torque is lager than we needed.

Attention:

During the restoration,the spring return actuators’ output torque will not be affected by the imputing air from the port B. On the contrary, it will help the restoration of springs.