Deluge valve in aluminium bronze, model PD-AB

Manufactured in-house

Deluge Valve Aluminium Bronze (Model PD-AB)

A system control valve for extra-high-hazard areas with rapidly spreading fire, protected by medium and high velocity water spray systems and by pre-action, deluge and large foam sprinkler systems.

Request quotation Datasheet PDF ↓

At a glance

Model: PD-AB
Nominal size: 80, 100, 150 and 200 mm
Maximum pressure: 17.84 kg/cm² (250 psi)
Trim: Aluminium bronze

Specification

Model	PD-AB
Nominal size	80, 100, 150 and 200 mm
Maximum working pressure	17.84 kg/cm² (250 psi)
Flange connection	ANSI B 16.5 RF #150 (flange drilling to ANSI B 16.5 #150)
Trim	Aluminium bronze
Finish	Natural finish
Ordering information	Specify size, and trim type — dry pilot, wet pilot, electric release, or test and alarm
Body material	Aluminium bronze
Seat	Stainless steel (SS 316) or bronze
Orientation	Vertical inlet, horizontal outlet
End connections	Flanged or flangeless
Operation	Piston operated with rubber sealing, auto-reset
Warranty	5 years
Commissioning	No special tools required

Net weight without trim

Nominal size	Weight, approx.
200 NB	168 kg
150 NB	75 kg
100 NB	55 kg
80 NB	43 kg

Major components

Item	Component	Material
1	Valve body	Aluminium bronze
2	Top cover	Aluminium bronze
3	Piston plate assembly	Top, middle and bottom plates with rubber bucket seals
4	Middle flange	Aluminium bronze
5	Spindle	Aluminium bronze
6	Valve disc	Rubber seat, held by a disc lock nut
7	Valve seat	Attached to the valve body
8	Hand hole cover	Aluminium bronze

Item numbers refer to the exploded view in the gallery.

Construction & operation

The deluge valve is the system control valve in a deluge system: a special-purpose valve for extra high hazard areas where fire spreads rapidly, protected by medium and high velocity water spray systems, pre-action and deluge sprinkler systems, and large foam systems.

It is a quick-release, hydraulically operated diaphragm valve with three chambers, isolated from each other by a piston operating with rubber sealing. It is suitable for fresh water and marine service; standard construction has cast stainless steel body internals for fresh water.

Trims

Dry trim. The detector or pilot line is charged with air. When the air pressure is lost, water drains from the pilot valve and the deluge valve opens fully and instantly.

Wet trim. The detector or pilot line is charged with water. When pressure is lost, the main valve cover chamber drains directly and the deluge valve opens fully and instantly.

Electric trim. A solenoid valve drains the water from the top chamber of the deluge valve; when the electric signal is de-energised, the valve resets automatically. A pressure switch raises an electric alarm, shuts down equipment or gives a "Tripped" indication at the panel.

Every trim carries test and drain features for test and reset.

Optional accessories

A bypass valve for emergency operation
An air- or water-operated alarm

How it is built

The body holds no pressure while the valve is inactive; the valve disc (item 6) holds back the supply. The top cover is the main pressure-containing part: it is filled with water from the bottom of the valve through a stainless steel tube, so its internal pressure equals the supply line pressure, and it is clamped to the body with a grooved coupling.

The piston plate assembly moves up and down inside the top cover. The middle flange divides the valve in two: the pressure-containing part above, enclosed by the top cover, and the body below, which is dry and empty. The spindle transfers pressure from the top cover to the valve disc, which carries a rubber seat held by a disc lock nut. Disc and seat together make the inlet leak-proof. The hand hole cover gives access for maintenance of the seat and disc joint.