ISO 22109:2020 pdf download

ISO 22109:2020 pdf download.Industrial valves — Gearbox for valves
1 Scope
This document provides basic requirements for gearboxes to operate industrial valves for manual and automated on/off and modulating duties, this includes manual override gearboxes. It includes guidelines for classification, design and methods for conformity assessment. It does not cover gear systems which are integral part in the design of valves and subsea gearboxes. Other requirements or conditions of use different from those indicated in this document are agreed between the purchaser and the manufacturer or supplier (first party), prior to order.
2 Normative references
The following documents are referred to in the text in such a way that some or all of their content constitutes requirements of this document. For dated references, only the edition cited applies. For undated references, the latest edition of the referenced document (including any amendments) applies.
ISO 5210, Industrial valves — Multi-turn valve actuator attachments
ISO 5211, Industrial valves — Part-turn actuator attachments
IEC 60529, Degrees of protection provided by enclosures (IP Code)
3 Terms and definitions
For the purposes of this document, the following terms and definitions apply.
ISO and IEC maintain terminological databases for use in standardization at the following addresses:
— ISO Online browsing platform: available at https:// www .iso .org/ obp
— IEC Electropedia: available at http:// www .electropedia .org/
3.1 gearbox
self-contained gear unit for torque/thrust/speed/orientation change that can be manually operated by handwheel/lever and/or automated with an actuator
3.2 ambient temperature
temperature of the environment surrounding the gearbox (3.1)
3.3 end of travel
predefined position related to a fully open or a fully closed condition
3.4 end stop
mechanical device designed to stop the gearbox (3.1) drive train movement
3.5 endurance
lifetime without failure at specified conditions and tested by the type test
4.2 Kind of operation
There are three kinds of operation: — manual: gearbox designed for manual operation only, typically this has only one input, normally by a handwheel; — automated: gearbox designed for automated operation, typically this has only one input, normally by an actuator for example according to ISO 22153; — manual override: gearbox designed for overriding automated operation, typically this has two inputs. The primary input is normally an actuator. The secondary input is normally by a handwheel. The secondary input is normally disengaged when the gearbox is being used in automated mode and is engaged when manual operation is required, e.g. on loss of power.
5.3 Self-locking/braking
The physical concept of self-locking only applies to particular gearbox designs and is not securing positions under all conditions, e.g. vibrations. If the position of the gearbox shall be stable with torques applied to the output, the gearbox and/or additional components might need to be designed for these applications. Braking, locking devices or assemblies might be integral parts of gearboxes and/or additional components provided by the supplier to the customer/end-user, in order to secure any given position within the stroke or cycle (in particular in the fully closed position). In order to provide better positioning, and limit overshooting of positions, active braking or other solutions can be necessary to incorporate into the gearbox and/or additional components.