PRIORITY DEMAND VALVE FOR BS9251 2021 &                            BS9251 2014

BS9251 2014 Priority demand valve with failsafe actuator Failsafe WRAS approved butterfly valve for large pipe systems

WRAS approved butterfly valve 2.5" upto 6" with failsafe actuator

24VDC flow switch connection

Position indicator

Valve fails safe in power outage and closes  

LED for power good

LED for flow switch activated

Labelled for fitting/ wiring/ bypass/ testing 

3D modelled videos of residential towers with sprinklers

Double click the two images below


They will open in linkedin, but you don't have to log in. The 2 videos explain the BS9251 2014 rules and how to fit the product, bridging the gap between the various trades involved.  The valve is already compliant with BS9251 2021

Priority demand valve 2.5" to 6" WRAS approved butterfly valve with failsafe actuator
priority demand valve Failsafe Butterfly[...]
Adobe Acrobat document [2.6 MB]
Priority demand valve data sheet 3/4" to 2" WRAS approved BSPP threaded solenoid valve, failsafe
Priority demand valve for compliance with BS9251 2014
priority demand valve data sheet.pdf
Adobe Acrobat document [308.3 KB]
Priority demand valve WRAS approved Fire sprinkler priority demand valve
  • Pre-wired 24VDC circuit
  • Power good led
  • WRAS approved solenoid valve
  • Simple installation  mains plug 
  • WRAS solenoids, 3/4",1", 1.25" 1.5" and 2"



When required this can connect to the pump flow switch/ domestic water supply so that the domestic water supply is shut off in the event of a fire.

Rules description 3.13 "valve for isolating the supply to the domestic supply in the event of sprinkler activation"


Normally closed valve, energised open- safe for the sprinklers


The valve can be used for; Booster Pump Isolation, Town main household supply shut off, priority for mains boosted sprinkler pump, pririty for sprinkler tank infill


When installing a domestic / residential sprinkler system system tank it is a requirement of BS9251 to have float switch monitoring the water level

WRAS approved for booster sets or dedicated tanks


Rule 5.2.7 Where the cistern provides a totally dedicated water supply for sprinklers, a low level alarm should be provided


This can easily integrate into all our pumped systems, making alarm connections simple


Grifen now supply a float, including;

5m connection cable

1" or 1/2" (same device) BSP tank adaptor

Monitors failsafe

FLOWST8n and DUPLIC8 have a 24vdc low level monitoring circuit as standard. The float switch can be monitored by the main control panel and alarmed on the general fault