Priority Demand Valve for Domestic/Residential Fire Sprinkler System 65-150mm/2.5-6"

Product Description

The SEP Priority Demand Valve (PDV) – brand new for 2021 – acts to isolate the domestic/ancillary water supply in the event of a fire sprinkler activation, or in the event of a power loss.

This product covers sizes from 50mm/2" up to 150mm/6" - we have another listing for pipe sizes up to 50mm/2".

The Requirement: BS9251 – the standard for ‘fire sprinkler systems for domestic and residential occupancies’ – states that IF:

• the mains water supply flow rate available to the fire sprinkler system is liable to be affected by domestic water usage (e.g. shower, washing machine etc), THEN
• a valve must be fitted to cut off supply for domestic use in the event of a sprinkler activation.
  Workings and Features

The flow switch (water flow detector) is connected into the IP-rated enclosure, creating a circuit that maintains the valve in the open position. If the flow switch is activated then the circuit is broken which closes the valve and shuts off the domestic water supply.

It is strongly recommended that an approved flow switch is used with this installation, which gives added benefits of false alarm protection and two sets of contacts.

The unit is provided with a fitted plug for ease; however, this is easily removed, should the preference be to install directly into a fused spur.

The Benefits of our Product

• The valve is WRAS-approved and therefore can be fitted directly to the mains water supply.
• 24-volt solenoid valve coil avoids the need for dangerous 240-volt power outside the IP-rated enclosure.
• An LED indicator on the 24V power supply confirms that power is present.
• Fail-safe – the valve closes if a signal is received from the sprinkler system flow switch, BUT it will also close in the event of power loss OR flow switch connection is lost, ensuring that the fire sprinkler is also safe.
• The fail-safe functionality does not preclude the installation of a restricted bypass around the PDV (complete with lockable and/or monitored isolation valve) to allow the provision of emergency water supplies in the event of a power loss which is not caused by a fire event.
• High IP rating means more flexibility when positioning the easy-mount enclosure and the valve itself.

Please see our website, email or call us for further information and pricing.