BS ISO 8626:1989+A1:2016

What is ISO 8626- Servo-hydraulic test equipment about? 

ISO 8626 is a safety standard on servo-hydraulic test equipment for generating vibration. 

The hydraulic test equipment used for generating vibration has a wide range of characteristics that can be evaluated in many ways.  

To enable the possibilities afforded by test equipment from various sources to be compared, ISO 8626 establishes: 

• List of the characteristics 
• The Standard method of obtaining certain of these characteristics 

ISO 8626 provides two levels of description to be used in describing the test equipment, as follows: 

• Level 1 description 
• Level 2 description 

ISO 8626 gives, for each level of description, chosen by agreement between the user and the manufacturer, a list of the characteristics to be described by the manufacturer in his tender as well as a list of technical documents to be supplied with the equipment. Furthermore, the manufacturer’s literature shall contain at least the characteristics corresponding to a level 1 description. 

Note: ISO 8626 applies to the following equipment: 

• Hydraulic Vibration generators [actuators, servo valves all or part of the Position control device and, if fitted, the static forte compensating device  
• The servo valve control devices 
• The hydraulic power systems 
• The complete hydraulic vibration generator systems 

Who is ISO 8626- Servo-hydraulic test equipment for?  

ISO 8626 on servo-hydraulic test equipment for generating vibration is relevant to: 

• Testing authorities 
• Manufacturers of hydraulic test equipment and machine 
• Manufacturers of tensile testing machine 
• Manufacturers of servo-hydraulic test equipment 

Why should you use ISO 8626- Servo-hydraulic test equipment? 

The term “hydraulic” means the vibratory movement produced results from the variable flow of a liquid which is ensured by means of an electrohydraulic control device fed by a hydraulic power system and acting on an actuator, using one or several control loops. 

ISO 8626 covers the characteristics of servo-hydraulic test equipment used for generating linear vibrations and serves as a guide for the selection of such equipment. 

Overall, ISO 8626 is useful as it enables the user to specify separately individual components of a servo-hydraulic vibration test system if he chooses to assemble the system from components obtained from more than one source.