Reliable DDV Diaphragm Deluge Valve, Electric Trim

Name: Reliable DDV Diaphragm Deluge Valve | Seven Star LLC
Brand: Reliable Sprinkler
SKU: DDV

Description

The Reliable DDV is a diaphragm-type deluge valve for open-sprinkler and water-spray systems, available from 1-1/2 in (40 mm) to 8 in (200 mm) with electric actuation, wet pilot and dry pilot trims. Its compact trim connects entirely to the valve body, the valve resets without removing the cover and it may be installed horizontally or vertically. A pressure regulating dry pilot version accepts up to 400 psi (27.6 bar) inlet pressure. Bulletin 551 (September 2025) states UL Listed and FM Approved.

How the diaphragm valve works

The diaphragm seals against a seat machined in the valve body. Water pressure in the chamber between diaphragm and cover presses it onto the seat. Releasing that pressure, by energising the solenoid or opening the manual emergency release, lets the diaphragm deform away from the seat so water flows. A Model A velocity check valve stops the chamber from re-pressurising during flow. Because all trim is connected to the body, the diaphragm can be removed without taking off the trim.

Key features from the bulletin

Three release packages: electric actuation, wet pilot line, dry pilot line (with optional pressure regulation).
Body and cover ductile iron with red oxide epoxy and urethane coating; diaphragm fabric-reinforced EPDM.
Grooved, flanged (Class 150, Class 300, PN16, BS-E) or threaded (NPT, ISO 7/1) ends, by size.
Optional RBVG or REL363GT grooved butterfly control valves with tamper switches.

Technical specifications

Data from Bulletin 551 Tables B to F and the part number chart.

Parameter	Specification
Electric actuator, standard	Parker Hannifin 24 VDC normally closed solenoid, model 73218BNUNLVNOC111C2: 10 W, 0.41 A holding, 175 psi (12.7 bar)
Electric actuator, optional	Parker Hannifin 24 VDC, model 73212BN4TNLVNOC322C2: 22 W, 0.92 A holding, 300 psi (20.7 bar)
Wet and dry pilot trims	Maximum rated pressure 400 psi (27.6 bar); flow not restricted; UL, FM
Regulating trim, cULus	Inlet 150 to 400 psi (10.3 to 27.6 bar); outlet 100 to 200 psi (6.9 to 13.8 bar) held within +/-10 percent when inlet is at least 50 psi above the set outlet pressure
Regulating trim, FM Global	Outlet 50 to 210 psi (3.4 to 14.5 bar); Table E lists a maximum flow of 1340 gpm (5072 L/min) for the 4 in valve
8 in valve	Not available with pressure regulating trim
Gauges	0-300 psi standard; 0-600 psi optional
Maximum valve temperature	120 F, minimum installed temperature 40 F (4 C)
Wet pilot line	1/2 in Schedule 40 galvanized pipe; F-FTR fixed temperature release detectors

Size	Cv gpm/psi^0.5	Equiv. length C=120	Equiv. length C=100
1-1/2 in (40 mm)	81.6	4.6 ft (1.4 m)	3.3 ft (1.0 m)
2 in (50 mm)	110.5	8.8 ft (2.7 m)	6.3 ft (1.9 m)
2-1/2 in (65 mm)	144	12.9 ft (3.9 m)	9.2 ft (2.8 m)
3 in (80 mm) / 76 mm	182	24.1 ft (7.3 m)	17.2 ft (5.2 m)
4 in (100 mm)	393	28.6 ft (8.7 m)	20.4 ft (6.2 m)
6 in (150 mm) / 165 mm	815	52.2 ft (15.9 m)	37.2 ft (11.3 m)
8 in (200 mm)	1455	59.7 ft (18.2 m)	42.6 ft (13.0 m)

Part number decoding

The production part number follows 6507 U V W X Y Z. U is the end connection (0 groove x groove, 1 to 4 flange x flange Class 150, Class 300, PN16 and BS-E, 5 NPT, 6 ISO 7/1). V is the size (0 for 1-1/2 in, 2, 1, 7, 3, 4, 6, 5, 8 for 2 in through 8 in). W is the trim (0 wet pilot, 1 dry pilot, 2 electric, 5 dry pilot pressure regulating). X is the control valve option (none, lower only, or lower and upper; grooved only, and not on 76 mm and 165 mm). Y selects drain trim with or without alarm test, and Z the gauge range or solenoid rating (0 for 175 psi, 1 for 300 psi).

Installation and operation notes

Install to NFPA 13 where the temperature stays at least 40 F (4 C). Wet pilot lines must not run through freezing areas. For electric release valves, install at least one electric manual release near the release control panel to help commissioning. The set-up procedure drains the system, seals the diaphragm by stabilising control-chamber pressure, confirms no flow at the upper drain and then slowly opens the main supply valve. An optional alarm line test kit and alarm pressure switch PN 6990006382 are available.

Typical applications

Diaphragm deluge valves serve open-nozzle systems for transformer, fuel and process hazards, where the regulating version can hold a lower outlet pressure under high supply pressure. Confirm design basis and local approval before ordering.

Selection and installation notes

A fire protection valve is only one part of a sprinkler system, which must be designed, installed and commissioned by qualified people to the standard and the authority rules that apply to the project. Confirm the size, the pressure rating and the trim configuration against the design, install the valve in the position and orientation in the manual, fit the drain and alarm connections as drawn, test the alarm and the flow before handover and keep the inspection and test records. Check the listing and approvals needed for the project with the authority before purchase.

Information needed for a quotation

Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.

Documents and supply information

The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.

Frequently asked questions

What sizes are available?

1-1/2, 2, 2-1/2, 3, 4, 6 and 8 in, plus 76 mm and 165 mm metric sizes.

Which trims can the DDV be ordered with?

Electric actuation (175 or 300 psi solenoid), wet pilot, dry pilot and dry pilot pressure regulating.

What is the solenoid supply?

24 VDC Parker Hannifin normally closed solenoid: 10 W for the 175 psi option and 22 W for the 300 psi option.

Can it be installed horizontally?

Yes. Bulletin 551 states it is suitable for horizontal or vertical installation.

Is pressure regulation available on all sizes?

No. The 8 in valve is not available with the pressure regulating trim.

Datasheets & Documents

Datasheet Reliable Bulletin 551 Model DDV Diaphragm Deluge Valve, September 2025 Download

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About brand

Reliable Sprinkler is the brand of The Reliable Automatic Sprinkler Co., Inc., a fire protection manufacturer formed in 1920 that makes sprinklers, system valves and trim at its manufacturing headquarters in Liberty, South Carolina. Its products are documented in numbered technical bulletins listing approvals, dimensions and part numbers.

Seven Star LLC is an independent supplier in Muscat. We list Reliable sprinklers and valves, with each page summarising the official bulletin, for fire protection contractors and facilities in Oman and the GCC.

Reliable Sprinkler product series

Sprinklers include the F1FR56 K5.6 quick response sprinkler and the JL14 and JL17 ESFR pendent sprinklers (K14.0 and K16.8) for storage, and the MV is a medium velocity directional spray nozzle for water spray systems.

Valves include the DDX deluge valve with wet, dry or electric release trim, the DDV diaphragm deluge valve, the FX externally resettable dry pipe valve with the B1 accelerator, the Model E and E3 alarm check valves for wet pipe systems, the CVE grooved riser check valve and the FCA2 floor control assembly.

Where Reliable Sprinkler equipment is used

Commercial buildings, warehouses, factories, car parks and cold stores, and water spray protection of transformers, tanks and conveyors in industrial plants.

Ordering Reliable Sprinkler products: what we need

Send the model and SIN or part number, K-factor, temperature rating and finish for sprinklers, and the size, trim and pressure rating for valves, together with the approvals (cULus, FM) required by the project.

Browse Reliable Sprinkler products by category: Fire Fighting.