Fire Sprinkler Dry Valves

The Reliable® Model FX Dry Pipe Valve is a differential-style, externally resettable control valve designed for dry pipe fire protection systems. It features a lightweight ductile iron body with compact trim and is engineered to simplify system setup and maintenance—no priming water is required.

Key Features:

• Body construction: Lightweight ductile iron with compact trim design
• External reset: Minimizes setup and commissioning time
• Priming water: Operates without the need for it
• Connection options: Grooved end, flanged end, or flange × grooved end (see PDF Table A)
• Accelerator compatibility: Works with the Reliable Model B1 Accelerator (ordered separately)

Functionality:

The valve remains closed by pneumatic pressure applied to a larger surface area than that of the incoming water. Upon release of air or nitrogen pressure, the valve opens to admit water into the sprinkler system.

For applications requiring faster response, all sizes of the FX valve can be equipped with the Reliable Model B1 Accelerator (PN 650120001A). The accelerator detects a rapid drop in air or nitrogen pressure and opens a pathway to the valve’s intermediate chamber, accelerating valve operation and improving overall trip time.

The Model FX Dry Pipe Valve is ideal for use in environments subject to freezing conditions, where dry pipe systems are essential.