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 and news
Download your free guide.
Four new types of prior approval for solar developments
Online Planning Portal application types from 5 September.
Election fails to spark construction industry revival
Contract awards and planning; post election.
Making diversity and inclusion easy for SMEs
The CIOB tool for companies with limited resources.
Sustainable Futures: Redefining Retrofit for Net Zero Living
BSRIA Briefing 2024, initial speakers announced.
Looking back at the UK's first Passivhaus leisure centre
Reflections on St Sidwell’s Point with CIAT.
A-Level results and electrical apprenticeships
Electrical Skills Index highlights areas with skills shortages.
One of the world's more unusual drive-throughs.
A quick introduction.
Hadrian's Wall Path and the national trails
The trails are heritage assets in their own right.
Articles on timely advice and hydraulic lime.
Building Designers Association of Australia
CIAT and BDAA sign Memorandum of Understanding.
Built Environment Inclusive partners issue statement committed to inclusion.
Building regulation requirements can have unintended consequences.
CIOB announces 2024/25 vice president
Sustainability champion Professor Saul Humphrey.
Accelerating towards a net-zero built environment.