Spring actuator
Guide to Controls (BG 83/2023) written by John Marrow and published by BSRIA in June 2023, states in relation to spring actuators or power fail actuators: ‘Sometimes, a control valve needs to fully close or open quickly during a high temperature or power failure condition. In this case the actuator is provided with a spring or power return feature. On excess temperature a separate high limit device, such as a thermostat, can be used to break the power supply. This releases a clutch within the actuator which takes control away from the normal sensor. The spring will quickly close the valve or, in some applications, open it to relieve the high temperature. The same would also happen in an unmanaged electrical supply failure.’
--BSRIA
[edit] Related articles on Designing Buildings
Featured articles
Check out some of the best features and news from Designing Buildings as well as key stories from around the web.
Channel 4 broadcaster to host 125th anniversary ceremony.
Listed structures on the rail network
Heritage interests and operational requirements must be balanced.
Historic England publishes research into embodied carbon when retrofitting traditional buildings.
New Prime Minister delivers on ECA call for cut in electricity costs.
CIOB reacts to the announcement of Andy Burnham as Prime Minister.
Heritage and conservation science workforce survey - Have your say.
England's Suburbs 1820-2020. Book review.
New, more proportionate and targeted approach for higher-risk building assessments.
Government brings British Steel into public ownership.
UKCW Birmingham returns with bold new theme and focus.
New guidance published on competence requirements for self-certification schemes.
Construction Management, 8 July
NEETs crisis drives interest in trades, but apprenticeships barriers remain.