You are using an outdated browser. Please
upgrade your browser
to improve your experience.
Error message
Deprecated function: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in Drupal\persistent_login\CookieHelper->getCookieName() (line 55 of modules/contrib/persistent_login/src/CookieHelper.php).
Deprecated function: preg_replace(): Passing null to parameter #3 ($subject) of type array|string is deprecated in Drupal\persistent_login\CookieHelper->getCookieName() (line 55 of modules/contrib/persistent_login/src/CookieHelper.php).
Valves primarily for use in heated water systems - Control valves
Description
This document sets out the requirements for the design, construction, testing and performance of the following types of water valves and devices: (a) Vacuum relief valves; (b) Thermosiphon arrestor valves; (c) Primary temperature control valves; (d) Inlet pressure control valves; (e) Isolating valves; (f) Thermal switching valves; (g) Air eliminators.